CN104608919A - Leading-edge slat with drainage groove and designing method of drainage groove - Google Patents

Leading-edge slat with drainage groove and designing method of drainage groove Download PDF

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Publication number
CN104608919A
CN104608919A CN201510083434.7A CN201510083434A CN104608919A CN 104608919 A CN104608919 A CN 104608919A CN 201510083434 A CN201510083434 A CN 201510083434A CN 104608919 A CN104608919 A CN 104608919A
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China
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drainage trough
point
interior
leading edge
controlling
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Inventor
褚胡冰
张彬乾
陈真利
袁昌盛
张明辉
李栋
张永杰
张怡哲
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Northwestern Polytechnical University
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Northwestern Polytechnical University
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Priority to CN201510083434.7A priority Critical patent/CN104608919A/en
Publication of CN104608919A publication Critical patent/CN104608919A/en
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Abstract

The invention relates to a leading-edge slat with a drainage groove and a designing method of the drainage groove. By designing the drainage groove with a certain geometric shape, a wide inlet formed in the lower surface and a narrow outlet formed in the upper surface in the leading-edge slat, and by utilizing the pressure difference of the upper and lower surfaces of the leading-edge slat, an air flow with high pressure of the lower surface of the leading-edge slat is introduced into the upper surface of the leading-edge slat by virtue of the drainage groove and is blown out along the tangential direction of the upper surface of the leading-edge slat for blowing down a low-energy air flow piled on the upper surface of the leading-edge slat, repairing a damaged speed type of a boundary layer, lowering the thickness of the boundary layer and improving the ability of the boundary layer to resist adverse pressure gradient, and thus, separation of the air flow, around the leading-edge slat, is delayed, the stalling process of an aircraft is slow, variation of the aircraft lift after stalling is mitigated, and the stalling characteristic of the aircraft is alleviated. According to the invention, the leading-edge slat is applied to some civil aircraft and is capable of postponing the stall angle alpha stall of an aircraft body combination of equal-chord swept back wings of the aircraft by 1 degree when the aircraft is in a typical takeoff/landing state with the flight speed being mach number 0.20 and turning the aircraft into slow stalling from sudden stalling, and the lift variation after stalling is small, so that the stalling prewarning time is effectively prolonged, and the flight safety is improved.

Description

A kind of have the leading edge slat of drainage trough and the method for designing of drainage trough
Technical field
The present invention relates to field of flight vehicle design, specifically a kind of have the leading edge slat of drainage trough and the method for designing of drainage trough.
Background technology
The integrated mode of leading edge slat, main wing section and trailing edge flap is adopted to be that present generation aircraft obtains high lift and take off to complete/the main method of landing mission.Wherein, the Main Function of leading edge slat is: postpone the burbling on wing, make aircraft just stall can occur under the larger incoming flow angle of attack, thus improve stall angle (stall angle refers to the incoming flow angle of attack corresponding to maximum lift), the increase aircraft maximum lift of aircraft, promote aircraft delelivered payload capability, expand flight boundary.
Main Function due to leading edge slat is to postpone aircraft stall, and therefore, the flow characteristic of leading edge slat self has material impact to aircraft stall characteristic.To take off/landing period, aircraft is with during close to the incoming flow angle of attack corresponding to maximum lift and stall angle flight, the pressure coefficient peak value of leading edge slat is very high, adverse pressure gradient near pressure coefficient peak value is very strong, easily causes the air-flow around leading edge slat to be separated suddenly, forms large-scale low-yield wake, and fall into oblivion the main wing section and the trailing edge flap that are positioned at downstream, cause airplane ascensional force to reduce rapidly, cause aircraft and fall off, jeopardize flight safety.
Because leading edge slat has material impact to aircraft stall characteristic.Therefore, suppressing or postpone around the burbling of leading edge slat is improve to take off/the key of landing period stalling characteristics.
The method of burbling is suppressed to have a variety of.Such as, patent US8256720 and patent CN200880020369.1 controls burbling by installing vortex generator on aircraft wing and engine nacelle, in aerofoil profile leading edge, document " Autonomous Sensing andControl of Wing Stall Using a Smart Plasma Slat " is by arranging that plasma excitation bar controls the burbling of aerofoil profile leading edge, at body surface, document " Advanced Aerodynamic Flow Control Using MEMS " is by arranging that miniature piezoelectric actuator MEMS controls the burbling on wing, document " Active Flow Control forPractical High-Lift Systems " adopts the method for carrying out blowing at leading edge slat upper surface layout gas hole to control the burbling of leading edge slat, all achieve certain effect.But still there is significant limitation in above-mentioned flow control technique.Such as, because leading edge slat size is little, be difficult to adopt the method at leading edge slat upper surface stickup vortex generator to carry out flowing control, and vortex generator is exposed to body surface, can have a negative impact to aircraft cruising flight performance; Because the air-flow velocity around leading edge slat is very high, as active Flow Control methods such as using plasma excitation or miniature piezoelectric actuator MEMS, need the power improving exiter, sizable energy cost will be paid, and need the excitation array of complicated layout; And if carry out active at leading edge slat upper surface and to blow control, except needs are laid additional pipe and caused structural weight and increase, the source of the gas supply needed for controlling that how to ensure to blow also is a great problem.
Summary of the invention
Control the deficiency of needs for overcoming the flowing that can not meet leading-edge slat well existed in prior art, the present invention proposes a kind ofly has the leading edge slat of drainage trough and the method for designing of drainage trough.
Of the present invention have the leading edge slat of drainage trough to comprise inner segment drainage trough, outer section of drainage trough and cover plate actuation mechanism; The both sides of this leading edge slat exhibition that is distributed in length 1/2 place that described inner segment drainage trough and outer section of drainage trough are symmetrical respectively, wherein: one end of inner segment drainage trough apart from the distance of this leading edge slat inner end surface be the exhibition of this leading edge slat to 5% of length, the other end of inner segment drainage trough is that the exhibition of this leading edge slat is to 2.5% of length apart from the exhibition of this leading edge slat to the distance at length 1/2 place; One end of outer section of drainage trough apart from the distance of this leading edge slat outer face be the exhibition of this leading edge slat to 5% of length, the other end of outer section of drainage trough is that the exhibition of this leading edge slat is to 2.5% of length apart from the exhibition of this leading edge slat to the distance at length 1/2 place.Described leading edge slat inner end surface is the end face of this leading edge slat along exhibition to close wing root one end, and leading edge slat is end face is that this leading edge slat is along exhibition to the end face near wing tip end.
The entrance of described inner segment drainage trough and the entrance of outer section of drainage trough are all positioned on the cavity face of leading edge slat lower surface, and before being in the junction of leading edge slat slide rail and main wing section 2.
The outlet of described inner segment drainage trough and the outlet of outer section of drainage trough are all positioned at the upper surface of leading edge slat, and make the upper surface of the outlet of described each drainage trough and leading edge slat tangent; All there is drainage trough to export cover plate in the exit of described each drainage trough.
The described cover plate being positioned at the outlet of each drainage trough is that the leading edge slat upper surface covering in cutting drainage trough exit is as this cover plate; The lower surface of described cover plate is provided with actuation mechanism, and when drainage trough works, actuation mechanism will drive cover plate around hinge deflection β ° of angle, open drainage trough outlet; When drainage trough does not work, actuation mechanism drives and is resetted by cover plate, and closed drainage groove exports.
The detailed process of the described leading edge slat drainage trough of design that the present invention proposes is:
Step 1, determines width and the locus of each entrance of drainage trough.
Setting leading edge slat is inner end surface along exhibition to the end face near wing root side, and leading edge slat is outer face along exhibition to the end face near wing tip side.
Step 1.1: the width determining each entrance of drainage trough.
1 leading edge point and the trailing edge point extracting leading edge slat respectively:
Extract the leading edge point of leading edge slat: described leading edge point comprises the leading edge point of inner segment drainage trough and the leading edge point of outer section of drainage trough; Specifically inner segment drainage trough is near the leading edge point a at this leading edge slat inner end surface place interior 1with the leading edge point a opened up near this leading edge slat to length 1/2 place interior 2; The outer section of leading edge point a of drainage trough near this leading edge slat outer face place outer 1with the leading edge point a opened up near this leading edge slat to length 1/2 place outer 2.Described leading edge point a interior 1exhibition to position apart from this leading edge slat inner end surface be 5%, described leading edge point a outer 1exhibition to position apart from this leading edge slat outer face be also 5%.Described leading edge point a interior 2exhibition be 2.5% to position apart from the exhibition of this leading edge slat to the distance of length 1/2; Described leading edge point a outer 2exhibition be also 2.5% to position apart from the exhibition of this leading edge slat to the distance of length 1/2.
Extract the trailing edge point of leading edge slat: described trailing edge point comprises the trailing edge point of inner segment drainage trough and the trailing edge point of outer section of drainage trough; On this leading edge slat, trailing edge point is extracted according to the method for the leading edge point of described extraction leading edge slat 1.
II line making described each leading edge point and each trailing edge point respectively, specifically:
Make leading edge point a interior 1with trailing edge point b interior 1line and this wire length is designated as C interior 1; Make leading edge point a interior 2with trailing edge point b in 2line, and this wire length is designated as C interior 2.Make leading edge point a outer 1with trailing edge point b outer 1line, and this wire length is designated as C outer 1; Make leading edge point a outer 2with trailing edge point b outer 2line, and this wire length is designated as C outer 2.By the line C between each leading edge point of obtaining and each trailing edge point interior 1, C interior 2, C outer 1and C outer 2determine that inner segment drainage trough two ends and outer section of drainage trough two ends are at the width of this leading edge slat along each entrance tangential respectively.Wherein: inner segment drainage trough is near the width D 1 of wing root side interior 1=0.1C interior 1, inner segment drainage trough is near the width D 1 of wing tip side interior 2=0.1C interior 2; The width D 1 of outer section of drainage trough near wing root side outer 2=0.1C outer 2, inner segment drainage trough is near the width D 1 of wing tip side outer 1=0.1C outer 1.
Step 1.2: the locus determining each entrance of drainage trough.
When determining the locus of each entrance of drainage trough, described leading edge slat should be in full open position during landing.
Step 1.2.1: the lower boundary point determining each entrance of inner segment drainage trough:
On the leading edge slat opened completely, with leading edge point a interior 1for starting point is horizontal-extending line L1 interior 1, this L1 interior 1length=0.3C interior 1.At described L1 interior 1destination county do vertical line, and make this vertical line crossing with the lower surface of the leading edge slat be under full open position, obtain intersection point f interior 1; Described f interior 1point is the lower boundary point of inner segment drainage trough inner end surface one side entrance.
On the leading edge slat opened completely, with leading edge point a interior 2for starting point is horizontal-extending line L1 interior 2, this L1 interior 2length=0.3C interior 2.At described L1 interior 2destination county do vertical line, and make this vertical line crossing with the lower surface of the leading edge slat be under full open position, obtain intersection point f interior 2; Described f interior 2point is the lower boundary point of inner segment drainage trough outer face one side entrance
Step 1.2.2: the coboundary point determining each entrance of inner segment drainage trough:
Be f interior 1the vertical line of point, this vertical line upwards extends, and at the D1 of this extension line interior 1=0.1C interior 1place makes horizon; The intersection point of described horizon and leading edge slat lower surface is the coboundary point g of inner segment drainage trough inner end surface one side entrance interior 1.
Be f interior 2the vertical line of point, this vertical line upwards extends, and at the D1 of this extension line interior 2=0.1C interior 2place makes horizon; The intersection point of described horizon and leading edge slat lower surface is the coboundary point g of inner segment drainage trough outer face one side entrance interior 2.
Step 1.2.3: coboundary point and the lower boundary point of determining the outer section of each entrance of drainage trough:
Determine the lower boundary point of each entrance of inner segment drainage trough and the method for coboundary point according to described, determine lower boundary point and the coboundary point of the outer section of each entrance of drainage trough, obtain the lower boundary point f of outer section of drainage trough inner end surface one side entrance respectively outer 2, outer section of drainage trough outer face one side entrance lower boundary point f outer 1, outer section of drainage trough inner end surface one side entrance coboundary point g outer 2with the coboundary point g of outer section of drainage trough outer face one side entrance outer 1.
Step 1.3: the entrance determining each drainage trough.
Step 1.3.1: the entrance determining inner segment drainage trough:
Connect lower boundary point and the coboundary point of each entrance of inner segment drainage trough obtained respectively: by the lower boundary point f of described inner segment drainage trough inner end surface one side entrance interior 1respectively with the lower boundary point f of straight line and inner segment drainage trough outer face one side entrance interior 2with the coboundary point g of inner segment drainage trough inner end surface one side entrance interior 1connect; By the coboundary point g of described inner segment drainage trough outer face one side entrance interior 2respectively with straight line and inner segment drainage trough near coboundary, inner end surface side point g interior 1with the lower boundary point f of inner segment drainage trough outer face one side entrance interior 2connect.Form quadrangle in space after connecting between described each point, described quadrangle is projected in leading edge slat lower surface, is obtained the border of described inner segment drainage trough entrance by this projection; Boundary line along this projection is cut leading edge slat lower surface, and the otch formed at this wing lower surface is described inner segment drainage trough entrance.
Step 1.3.2: determine outer section of drainage trough entrance:
Determine that the method for the entrance of inner segment drainage trough determines the entrance of outer section of drainage trough according to described.
Step 2, determines the size that each drainage trough exports and locus.
Step 2.1: determine the fore boundary point that inner segment drainage trough respectively exports: the fore boundary point that described inner segment drainage trough respectively exports comprises the fore boundary point of inner segment drainage trough inner end surface one side outlet and the fore boundary point of inner segment drainage trough outer face one side outlet.
Step 2.1.1: the fore boundary point determining inner segment drainage trough inner end surface one side outlet:
On the leading edge slat opened completely, be leading edge point a interior 1with trailing edge point b interior 1between horizontal line, line taking section L2 on this line interior 1, and make this line segment L2 interior 1starting point be leading edge point a interior 1, length=0.12C interior 1.At described line segment L2 interior 1destination county do vertical line, this vertical line is crossing with the upper surface of the leading edge slat be under full open position, obtains intersection point d interior 1; Described d interior 1be the fore boundary point of inner segment drainage trough inner end surface one side outlet.
Step 2.1.2: the fore boundary point determining inner segment drainage trough outer face one side outlet:
On the leading edge slat opened completely, be leading edge point a interior 2with trailing edge point b interior 2between horizontal line, line taking section L2 on this line interior 2, and make this line segment L2 interior 2starting point be leading edge point a interior 2, length=0.12C interior 2.At described L2 interior 2destination county do vertical line, this vertical line is crossing with the upper surface of the leading edge slat be under full open position, obtains intersection point d interior 2; Described d in 2be the fore boundary point of inner segment drainage trough outer face one side outlet.
Step 2.2: determine the rear boundary point that inner segment drainage trough respectively exports: the rear boundary point that described inner segment drainage trough respectively exports comprises the rear boundary point of inner segment drainage trough inner end surface one side outlet and the rear boundary point of inner segment drainage trough outer face one side outlet.
Step 2.2.1: the rear boundary point e determining inner segment drainage trough inner end surface one side outlet interior 1:
On the leading edge slat opened completely, with inner segment drainage trough inner end surface one side outlet fore boundary point d interior 1for starting point, be the extended line D3 of leading edge slat upper surface tangential direction interior 1, this D3 interior 1length=0.24C interior 1, this D3 interior 1bearing of trend be trailing edge point b interior 1place.At described D3 interior 1destination county does the normal of leading edge slat upper surface, and this normal is crossing with leading edge slat upper surface obtains an e interior 1, intersection point is the rear boundary point e of inner segment drainage trough inner end surface one side outlet interior 1.
D3 allfor the width average that drainage trough exports at leading edge slat upper surface, D3 all=0.5 (D3 outer 1+ D3 outer 2) or=0.5 (D3 interior 1+ D3 interior 2).Described D3 interior 1and D3 outer 2for the width exported at leading edge slat upper surface near the drainage trough of leading edge slat inner end surface; Described D3 outer 1and D3 interior 2for the width exported at leading edge slat upper surface near the drainage trough of leading edge slat outer face.
Step 2.2.2: the rear boundary point e determining inner segment drainage trough outer face one side outlet interior 2:
On the leading edge slat opened completely, with inner segment drainage trough inner end surface one side outlet fore boundary point d interior 2for starting point, be the extended line D3 of leading edge slat upper surface tangential direction interior 2, this D3 interior 2length=0.24C interior 2, this D3 interior 2bearing of trend be trailing edge point b interior 2place.At described D3 interior 2destination county does the normal of leading edge slat upper surface, and this normal is crossing with leading edge slat upper surface obtains an e interior 2, intersection point is the rear boundary point e of inner segment drainage trough outer face one side outlet interior 2.
When the fore boundary point that the inner segment drainage trough that connection obtains respectively exports and rear boundary point, by the fore boundary point d of described inner segment drainage trough inner end surface one side outlet interior 1respectively with the fore boundary point d of straight line and inner segment drainage trough outer face one side outlet interior 2with the rear boundary point e of inner segment drainage trough inner end surface one side outlet interior 1connect; By the rear boundary point e of described inner segment drainage trough outer face one side outlet interior 2respectively with boundary point e after straight line and inner segment drainage trough inner end surface side interior 1with the fore boundary point d of inner segment drainage trough outer face one side outlet in 2connect.
Step 2.3: determine the fore boundary point that outer section of drainage trough respectively exports and rear boundary point:
According to the method determining the fore boundary point that inner segment drainage trough respectively exports described in step 2.1, determine the fore boundary point that outer section of drainage trough respectively exports, obtain the fore boundary point d of outer section of drainage trough inner end surface one side outlet respectively outer 2with the fore boundary point d of outer section of drainage trough outer face one side outlet outer 1.
According to the method determining the rear boundary point that inner segment drainage trough respectively exports described in step 2.2, determine the rear boundary point of outer section of drainage trough outlet, obtain the rear boundary point e of outer section of drainage trough inner end surface one side outlet respectively outer 2with the rear boundary point e of outer section of drainage trough outer face one side outlet outer 1.
Step 2.4: outlet and the drainage trough outlet cover plate 7 of determining each drainage trough:
Step 2.4.1: determine the outlet of inner segment drainage trough and the cover plate of this outlet:
Connect fore boundary point and rear boundary point that the inner segment drainage trough that obtains respectively exports respectively, make to form quadrangle in space between described fore boundary point each point and rear boundary point each point.Described quadrangle is projected in leading edge slat upper surface, is obtained the border of described inner segment drainage trough outlet by this projection; Boundary line along this projection is cut leading edge slat upper surface, and the otch formed at this upper surface of the airfoil is the outlet of described inner segment drainage trough, and the leading edge slat upper surface cut down is the outlet cover plate of inner segment drainage trough.
The fore boundary point d of described inner segment drainage trough inner end surface one side outlet interior 1be the fore boundary point of described outlet cover plate.
Step 2.4.2: determine the outlet of outer section of drainage trough and the cover plate of this outlet:
Determine that the method for the outlet of inner segment drainage trough and the cover plate of this outlet determines the outlet of outer section of drainage trough and the cover plate of this outlet according to described.
Step 3, determines the profile of each drainage trough cell wall.The profile of described each drainage trough cell wall comprises both sides cell wall and the outer section of drainage trough both sides cell wall of inner segment drainage trough.
Step 3.1: determine cell wall Controlling outline curve before inner segment drainage trough:
Determine cell wall Controlling outline curve before inner segment drainage trough, this molded line comprises the Controlling outline curve of the outer face side of cell wall before the Controlling outline curve of the inner end surface side of cell wall before inner segment drainage trough and inner segment drainage trough.
Step 3.1.1: before determining inner segment drainage trough, the process of the Controlling outline curve of the inner end surface side of cell wall is:
On the leading edge slat opened completely, with the fore boundary point d of inner segment drainage trough inner end surface one side outlet interior 1for starting point, do the extended line of leading edge slat upper surface tangential direction, the length of this extended line is 0.05C interior 1, the bearing of trend of this extended line is leading edge point a interior 1place.The first controlling point i of the inner end surface side Controlling outline curve of cell wall before the terminal of described extended line is interior 1.
At leading edge point a interior 1with trailing edge point b interior 1line on, distance leading edge point a interior 1for 0.08C interior 1a j is got at place interior 1, as the second controlling point of the inner end surface side Controlling outline curve of cell wall before inner segment drainage trough.
Make leading edge slat leading edge point a interior 1with sharp beak point z interior 1line, get the mid point of line, and by the mid point of this line and leading edge slat trailing edge point b interior 1connect, be leading edge slat trailing edge point b interior 1with this line mid point and extended line, the intersection point of extended line and leading edge slat lower surface is designated as a h interior 1; Make some h interior 1with the line of leading edge slat trailing edge point, and apart from putting h on line interior 1for 0.08C interior 1a k is got at place interior 1, as the 3rd controlling point of the inner end surface side Controlling outline curve of cell wall before inner segment drainage trough.
Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports interior 1, the first controlling point i interior 1, the second controlling point j interior 1, the 3rd controlling point k interior 1with the lower boundary point f of drainage trough entrance interior 1connect successively, the Controlling outline curve of the inner end surface side of cell wall before acquisition inner segment drainage trough.
Step 3.1.2: the deterministic process of the Controlling outline curve of the outer face side of cell wall before inner segment drainage trough:
Before determining inner segment drainage trough, with described, the method for the Controlling outline curve of the outer face side of cell wall determines that the Controlling outline curve method of the inner end surface side of cell wall before inner segment drainage trough is identical, obtains the first controlling point i of the outer face side Controlling outline curve of cell wall before inner segment drainage trough respectively interior 2, the second controlling point j interior 2with the 3rd controlling point k interior 2; Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports interior 2, the first controlling point i interior 2, the second controlling point j interior 2, the 3rd controlling point k interior 2with the lower boundary point f of drainage trough entrance interior 2connect successively, the Controlling outline curve of the outer face side of cell wall before acquisition inner segment drainage trough.
So far, before inner segment drainage trough, two Controlling outline curves of cell wall are determined.
Step 3.2: determine cell wall Controlling outline curve after inner segment drainage trough.
After described inner segment drainage trough, cell wall Controlling outline curve comprises the Controlling outline curve of the outer face side of cell wall after the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough and inner segment drainage trough.
Step 3.2.1: the deflection angle determining the cover plate that drainage trough exports.
Step 3.2.2: the Controlling outline curve determining the inner end surface side of cell wall after inner segment drainage trough:
After described inner segment drainage trough, the Controlling outline curve of the inner end surface side of cell wall is divided into the Controlling outline curve of inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end.The train spacing point of the Controlling outline curve of described inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end is that the fore boundary point of cover plate deflects β inlocation point behind angle.
I Controlling outline curve determining inner segment drainage trough exit end:
The cover plate exported by drainage trough is around hinge deflection angle β in, obtain the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1, described n interior 1the drainage trough outlet fore boundary point d on inner segment drainage trough inner end surface side interior 1position after deflection.Obtain the Controlling outline curve of inner segment drainage trough exit end simultaneously; The two ends of the Controlling outline curve of described inner segment drainage trough exit end lay respectively at a n interior 1with an e interior 1place.
II Controlling outline curve determining inner segment drainage trough arrival end:
First each controlling point of the Controlling outline curve of described inner segment drainage trough arrival end is determined:
With the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1for starting point, to the leading edge point a of leading edge slat interior 1the tangent line of the Controlling outline curve of inner segment drainage trough exit end is done in direction, and this length of tangent degree is 0.1C interior 1; The terminal of this tangent line is the second controlling point o of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1.
At the leading edge point a of leading edge slat interior 1with trailing edge point b interior 1line on, distance leading edge point a interior 1for 0.18C interior 1place obtains the 3rd controlling point l of cell wall inner end surface side Controlling outline curve after inner segment drainage trough interior 1.
At a h interior 1with leading edge slat trailing edge point b interior 1line on, apart from some h interior 1for 0.16C interior 1the 4th controlling point m of cell wall inner end surface side Controlling outline curve after inner segment drainage trough is got at place interior 1.
Adopt non-uniform rational B-spline, by the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1, the second controlling point o interior 1, the 3rd controlling point l interior 1, the 4th controlling point m interior 1with the coboundary point g of drainage trough entrance interior 1connect successively, obtain non-homogeneous B spline curve.This non-homogeneous B spline curve is the Controlling outline curve of inner segment drainage trough arrival end.The Controlling outline curve of the inner segment drainage trough arrival end obtained is connected with the Controlling outline curve of inner segment drainage trough exit end, obtains the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough.
Step 3.2.3: the Controlling outline curve determining the outer face side of cell wall after inner segment drainage trough:
After described inner segment drainage trough, the Controlling outline curve of the outer face side of cell wall is divided into the Controlling outline curve of inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end.The train spacing point of the Controlling outline curve of described inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end is that the fore boundary point of cover plate deflects β inlocation point n behind angle interior 2.
By the Controlling outline curve of the outer face side of cell wall after the method determination inner segment drainage trough of determining the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough described in step 3.2.2, obtain the second controlling point o of the outer face side Controlling outline curve of cell wall after inner segment drainage trough interior 2, the 3rd controlling point l interior 2with the 4th controlling point m interior 2; After inner segment drainage trough, the first controlling point of the outer face side Controlling outline curve of cell wall is the fore boundary point deflection β of cover plate inlocation point n behind angle interior 2.
Adopt non-uniform rational B-spline by the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 2, the second controlling point o interior 2, the 3rd controlling point l interior 2, the 4th controlling point m interior 2with the coboundary point g of drainage trough entrance interior 2connect successively, obtain non-homogeneous B spline curve.This non-homogeneous B spline curve is the Controlling outline curve of inner segment drainage trough arrival end.The Controlling outline curve of the inner segment drainage trough arrival end obtained is connected with the Controlling outline curve of inner segment drainage trough exit end, obtains the Controlling outline curve of the outer face side of cell wall after inner segment drainage trough.
Step 3.2.4: the spatial form determining inner segment drainage trough:
The profile of the inner segment drainage trough entrance obtained in step 1 is as scanning plane, with the Controlling outline curve of the outer face side of cell wall after the Controlling outline curve of the inner end surface side of cell wall after the Controlling outline curve of the outer face side of cell wall before the Controlling outline curve of the inner end surface side of cell wall before the inner segment drainage trough obtained, inner segment drainage trough, inner segment drainage trough, inner segment drainage trough for controlling the Controlling outline curve of inner segment drainage trough spatial form for scanning control line, scan, obtain the spatial form of inner segment drainage trough.The profile of described inner segment drainage trough entrance refers to the profile in leading edge slat lower surface inner segment drainage trough to be cut inlet location.
Step 3.3. determines cell wall Controlling outline curve before outer section of drainage trough:
Determine cell wall Controlling outline curve before outer section of drainage trough, this molded line comprises the Controlling outline curve of the outer face side of cell wall before the Controlling outline curve of the inner end surface side of cell wall before outer section of drainage trough and outer section of drainage trough.
Step 3.3.1: the Controlling outline curve deterministic process of the inner end surface side of cell wall before outer section drainage trough:
On the leading edge slat opened completely, the fore boundary point d of section drainage trough inner end surface one side outlet in addition outer 2for starting point, do the extended line of leading edge slat upper surface tangential direction, the length of this extended line is 0.05C outer 2, the bearing of trend of this extended line is leading edge point a outer 2place.The first controlling point i of the inner end surface side Controlling outline curve of cell wall before the terminal of described extended line is outer 2.This controlling point is tangent for the upper surface of the outlet and leading edge slat 1 that ensure drainage trough 4.
At leading edge point a outer 2with trailing edge point b outer 2line on, distance leading edge point a outer 2for 0.08C interior 1a j is got at place outer 2, as the second controlling point of the inner end surface side Controlling outline curve of cell wall before outer section of drainage trough.
Make leading edge slat leading edge point a outer 2with sharp beak point z outer 2line, get the mid point of line, and by the mid point of this line and leading edge slat trailing edge point b outer 2connect, be leading edge slat trailing edge point b outer 2with this line mid point and extended line, the intersection point of extended line and leading edge slat lower surface is designated as a h outer 2; Make some h outer 2with the line of leading edge slat trailing edge point, and apart from putting h on line outer 2for 0.08C outer 2a k is got at place outer 2, as the 3rd controlling point of the inner end surface side Controlling outline curve of cell wall before outer section of drainage trough.
Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports outer 2, the first controlling point i outer 2, the second controlling point j outer 2, the 3rd controlling point k outer 2with the lower boundary point f of drainage trough entrance outer 2connect successively, obtain the Controlling outline curve of the inner end surface side of cell wall before outer section drainage trough.
Step 3.3.2: the Controlling outline curve determining the outer face side of cell wall before outer section of drainage trough:
Adopt the method for the Controlling outline curve of the inner end surface side of cell wall before determining outer section of drainage trough described in step 3.3.1 to determine the Controlling outline curve of the outer face side of cell wall before outer section of drainage trough, obtain the first controlling point i of the Controlling outline curve of the outer face side of cell wall before outer section of drainage trough outer 1, the second controlling point j outer 1with the 3rd controlling point k outer 1.Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports outer 1, the first controlling point i outer 1, the second controlling point j outer 1, the 3rd controlling point k outer 1with the lower boundary point f of drainage trough entrance outer 1connect successively, obtain the Controlling outline curve of the outer face side of cell wall before outer section drainage trough.
So far, before outer section of drainage trough, two Controlling outline curves of cell wall are determined.
Step 3.4: determine cell wall Controlling outline curve after outer section of drainage trough.
After described outer section of drainage trough, cell wall Controlling outline curve comprises the Controlling outline curve of the outer face side of cell wall after the Controlling outline curve of the inner end surface side of cell wall after outer section of drainage trough and outer section of drainage trough.
Step 3.4.1: the deflection angle determining the cover plate that drainage trough exports.
Step 3.4.2: the Controlling outline curve determining cell wall outer face side after outer section of drainage trough:
After described outer section drainage trough, the Controlling outline curve of cell wall outer face side is divided into the Controlling outline curve of the Controlling outline curve of outer section of drainage trough exit end and outer section of drainage trough arrival end.
The train spacing point of the Controlling outline curve of described outer section of drainage trough exit end and the Controlling outline curve of outer section of drainage trough arrival end is that the fore boundary point of cover plate deflects β outwardlocation point behind angle.
Described determine outer section of drainage trough after the method for Controlling outline curve of cell wall outer face side determine that the method for the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough is identical with described, specifically:
I Controlling outline curve determining outer section of drainage trough exit end:
The cover plate exported by drainage trough is around hinge deflection angle β outward, obtain the first controlling point n of cell wall outer face side Controlling outline curve after outer section of drainage trough outer 1, described n outer 1the drainage trough outlet fore boundary point d on outer section of drainage trough outer face side outer 1position after deflection.Obtain the Controlling outline curve of deflection state lower outside section of drainage trough exit end simultaneously.The two ends of the Controlling outline curve of described outer section of drainage trough exit end lay respectively at a n outer 1with an e outer 1place.
II Controlling outline curve determining outer section of drainage trough arrival end:
Determine the Controlling outline curve of outer section of drainage trough arrival end according to the method for the Controlling outline curve determining inner segment drainage trough arrival end described in step 3.2.2, obtain the second controlling point o of cell wall outer face side Controlling outline curve after outer section of drainage trough outer 1, the 3rd controlling point l outer 1with the 4th controlling point m outer 1; Adopt non-uniform rational B-spline, by the first controlling point n of cell wall outer face side Controlling outline curve after outer section of drainage trough outer 1, the second controlling point o outer 1, the 3rd controlling point l outer 1, the 4th controlling point m outer 1with the coboundary point g of drainage trough entrance outer 1connect successively, obtain non-homogeneous B spline curve.This non-homogeneous B spline curve is the Controlling outline curve of outer section of drainage trough arrival end.The Controlling outline curve of the outer section drainage trough arrival end obtained is connected with the Controlling outline curve of outer section of drainage trough exit end, obtains the Controlling outline curve of cell wall outer face side after outer section of drainage trough.
Step 3.4.3: the Controlling outline curve determining the inner end surface side of cell wall after outer section of drainage trough:
After described outer section drainage trough, the Controlling outline curve of the inner end surface side of cell wall is divided into the Controlling outline curve of the Controlling outline curve of outer section of drainage trough exit end and outer section of drainage trough arrival end.The train spacing point of the Controlling outline curve of described outer section of drainage trough exit end and the Controlling outline curve of outer section of drainage trough arrival end is that the fore boundary point of cover plate deflects β outwardlocation point behind angle.
Described determine outer section of drainage trough after the method for Controlling outline curve of inner end surface side of cell wall determine that the method for the Controlling outline curve of the outer face side of cell wall after inner segment drainage trough is identical with described;
I Controlling outline curve determining outer section of drainage trough exit end:
The cover plate exported by drainage trough is around hinge deflection angle β outward, obtain the first controlling point n of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough outer 2, described n outer 2the drainage trough outlet fore boundary point d on outer section of drainage trough inner end surface side outer 2position after deflection.Obtain the Controlling outline curve of deflection state lower outside section of drainage trough exit end simultaneously.The two ends of the Controlling outline curve of described outer section of drainage trough exit end lay respectively at a n outer 2with an e outer 2place.
II Controlling outline curve determining outer section of drainage trough arrival end:
Determine the Controlling outline curve of outer section of drainage trough arrival end according to the method for the Controlling outline curve determining inner segment drainage trough arrival end described in step 3.2.2, obtain the second controlling point o of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough outer 2, the 3rd controlling point l outer 2with the 4th controlling point m outer 2.Adopt non-uniform rational B-spline, by the first controlling point n of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough outer 2, the second controlling point o outer 2, the 3rd controlling point l outer 2, the 4th controlling point m outer 2with the coboundary point g of drainage trough entrance outer 2connect successively, obtain non-homogeneous B spline curve.This non-homogeneous B spline curve is the Controlling outline curve of outer section of drainage trough arrival end.The Controlling outline curve of the outer section drainage trough arrival end obtained is connected with the Controlling outline curve of outer section of drainage trough exit end, obtains the Controlling outline curve of the inner end surface side of cell wall after outer section of drainage trough.
Step 3.4.4: the spatial form determining outer section of drainage trough:
The profile of the outer section drainage trough entrance obtained in step 1 is as scanning plane, in addition before section drainage trough before the Controlling outline curve of the inner end surface side of cell wall, outer section of drainage trough after the Controlling outline curve of the outer face side of cell wall, outer section of drainage trough after the Controlling outline curve of the inner end surface side of cell wall, outer section of drainage trough the Controlling outline curve of cell wall outer face side be control inner segment drainage trough spatial form Controlling outline curve for scanning control line, carry out sweeping, obtain the spatial form of outer section of drainage trough.The profile of described outer section drainage trough entrance refers to the profile in leading edge slat lower surface outer section of drainage trough inlet location to be cut.
So far, the design of drainage trough on leading edge slat is completed.
The deflection angle of the cover plate of described drainage trough outlet is determined by formula (3):
β=arcsin (D2 all/ D3 all) (3)
In formula, the unit of β is degree.D2 allfor the width average of drainage trough outlet, D2 all=0.5 (D2 outer 1+ D2 outer 2) or=0.5 (D2 interior 1+ D2 interior 2); Described D2 interior 1and D2 outer 2for the drainage trough outlet width near leading edge slat inner end surface; Described D2 outer 1and D2 interior 2for the drainage trough outlet width near leading edge slat outer face;
D3 allfor the width average that drainage trough exports at leading edge slat upper surface, D3 all=0.5 (D3 outer 1+ D3 outer 2) or=0.5 (D3 interior 1+ D3 interior 2).Described D3 interior 1and D3 outer 2for the width exported at leading edge slat upper surface near the drainage trough of leading edge slat inner end surface; Described D3 outer 1and D3 interior 2for the width exported at leading edge slat upper surface near the drainage trough of leading edge slat outer face.
The described drainage trough outlet width near leading edge slat outer face is the normal of each drainage trough cell wall after this drainage trough is done at the fore boundary point place that leading edge slat upper surface exports, the distance between the fore boundary point that after this normal and drainage trough, the intersection point of cell wall and described leading edge slat upper surface export.
The present invention has certain geometric shape by design one on leading edge slat and the wide upper surface of lower surface entrance exports narrow drainage trough, utilize the difference of pressure of leading edge slat upper and lower surface, air-flow higher for leading edge slat lower surface pressure is caused leading edge slat upper surface by drainage trough, and blow out along the tangential direction of leading edge slat upper surface, in order to blow down the low-yield air-flow that leading edge slat upper surface is piled up, and repair impaired boundary-layer velocity profile, thinning boundary layer thickness, improve the ability of boundary-layer opposing adverse pressure gradient, thus the burbling postponed around leading edge slat, make the stall process of aircraft slow, airplane ascensional force change after stall relaxes, the stalling characteristics of aircraft are improved.
The geometric shape of described drainage trough opens up to the through conduit of the upper and lower surface being parallel to leading edge slat leading edge along leading edge slat, and the section shape of conduit is that the wide upper surface of lower surface entrance exports narrow contraction section.
Described drainage trough is positioned on the leading edge slat of aircraft, and arranges along the exhibition of leading edge slat to direction.The exhibition respectively remaining with 5% to the exhibition of two ends and leading edge slat on the plane of symmetry in the exhibition of leading edge slat does not arrange drainage trough to length, after ensureing increasing drainage trough, structural strength and the rigidity of leading edge slat still meet design requirement, and reduce additional structural supports parts as much as possible.
The entrance of described drainage trough is positioned on the cavity face of leading edge slat lower surface, so that after leading edge slat packs up, drainage trough entrance can completely by the capping of main wing section leading edge institute, can not be exposed to wing lower surface and affect cruise profile and the cruising flight performance of aircraft.
Before the entrance of described drainage trough is positioned at the junction of leading edge slat slide rail and main wing section, so that after arranging drainage trough, leading edge slat still can be continued to use existing bindiny mechanism and actuation mechanism between itself and main wing section and design.
The outlet of described drainage trough is positioned at the upper surface of leading edge slat.For ensureing that the air-flow flowing through drainage trough is after the blowout of leading edge slat upper surface, can obtain best flowing control effects, drainage trough outlet is tangent with the upper surface of the leading edge slat in exit.
Be designed with cover plate in the exit of described drainage trough, so that drainage trough in a non-operative state, drainage trough outlet can be closed, and does not destroy aircraft and to cruise profile and cruising flight performance.
Being designed specifically to of the cover plate that described drainage trough exports: the leading edge slat upper surface covering in cutting drainage trough exit, obtains cover plate profile, and installs hinge at cover plate rear portion, to be hinged to the rear portion of drainage trough outlet by cover plate; The lower surface of cover plate is provided with actuation mechanism, and when drainage trough works, drive cover plate is deflected certain angle around hinge by actuation mechanism, thus forms drainage trough outlet, and meanwhile, lower inclined cover plate is using the part as drainage trough profile; When drainage trough does not work, cover plate resets by actuation mechanism, and closed drainage groove exports.
Non-homogeneous B spline curve of the present invention, its basic theories, concept, principle and algorithm can consult press of Tsing-Hua University being write by Pierre (U.S.), Te Laier (U.S.) in publication in 2010, " non-uniform rational B-spline (the 2nd edition) " book of Zhao Gang, Mu Guowang, Wang Lazhu translation.
Of the present invention have the leading edge slat of drainage trough to be applied to certain civil aircraft, to take off/landing state at the flying speed Typical Aircraft that is Mach number 0.20, can make this aircraft etc. the stall angle α of chord length swept back wing body combination stallpostpone 1 °; The most important thing is, aircraft becomes slow stall from original falling off, and the lift variation after stall is less, thus effectively increases stall pre-warning time, improves flight safety.
Compared with prior art, the present invention has following effect:
1. the present invention by designing drainage trough on leading edge slat, effectively can postpone the burbling of leading edge slat upper surface, make certain civil aircraft near stall angle, lift within the scope of i.e. incoming flow angle of attack=29 ° ~ 31 ° is substantially constant, thus significantly improve the stalling characteristics of aircraft, improve flight safety.
2. drainage trough of the present invention is arranged on the original leading edge slat of aircraft, therefore, can continue to use existing bindiny mechanism and actuation mechanism between leading edge slat and main wing section and design, reduce, to the change of aircraft original structure, to simplify design.In addition, leading edge slat along exhibition to two ends and the exhibition of leading edge slat to plane of symmetry place some exhibition of 5% each do not arrange drainage trough to length wing panel, to ensure structural strength and the rigidity requirement of leading edge slat, thus decrease auxiliary mechanism as much as possible.
3. drainage trough of the present invention is arranged on the original leading edge slat of aircraft, therefore, does not need to redesign leading edge slat geometric shape, is well suited for being applied on existing aircraft, to improve its stalling characteristics in the takeoff and anding stage further.
4. the present invention by designing drainage trough on leading edge slat, directly utilize the difference of pressure of leading edge slat upper and lower surface to form high-speed jet, for controlling the burbling of leading edge slat upper surface, therefore do not need auxiliary source of the gas, efficiently solve the source of the gas supply problem of restriction air blowing control technology application.
5. drainage trough entrance of the present invention is arranged on the cavity face of leading edge slat, and after leading edge slat is packed up, drainage trough entrance is completely capped, can not be exposed outside wing.In addition, drainage trough exit is designed with cover plate, and when drainage trough does not work, cover plate can carry out capping to drainage trough outlet.These detailed design ensure that drainage trough in a non-operative state, can not have a negative impact to cruise profile and cruising flight performance of aircraft.
Accompanying drawing explanation
Accompanying drawing 1 is that civil aircraft takes off the/profile birds-eye view of landing state;
Accompanying drawing 2 is the leading edge slat profile schematic diagrams having drainage trough;
Accompanying drawing 3 is size and the locus schematic diagram of drainage trough entrance and exit;
Accompanying drawing 4 is cover plate and the actuation mechanism schematic diagram thereof in drainage trough exit;
Accompanying drawing 5 is that leading edge slat drainage trough is arranged and each end face leading edge point and trailing edge space of points position view
Accompanying drawing 6a is the lower boundary point defining method instruction diagram of leading edge slat inner segment drainage trough inner end surface one side entrance; Accompanying drawing 6b is the lower boundary point defining method instruction diagram of leading edge slat inner segment drainage trough outer face one side entrance; Accompanying drawing 6c is the lower boundary point defining method instruction diagram of outer section drainage trough inner end surface one side entrance of leading edge slat; Accompanying drawing 6d is the lower boundary point defining method instruction diagram of outer section drainage trough outer face one side entrance of leading edge slat.
Accompanying drawing 7a is the coboundary point defining method instruction diagram of leading edge slat inner segment drainage trough inner end surface one side entrance; Accompanying drawing 7b is the coboundary point defining method instruction diagram of leading edge slat inner segment drainage trough outer face one side entrance; Accompanying drawing 7c is the coboundary point defining method instruction diagram of outer section drainage trough inner end surface one side entrance of leading edge slat; Accompanying drawing 7d is the coboundary point defining method instruction diagram of outer section drainage trough outer face one side entrance of leading edge slat.
Accompanying drawing 8a is the fore boundary point defining method instruction diagram of leading edge slat inner segment drainage trough inner end surface one side outlet; Accompanying drawing 8b is the fore boundary point defining method instruction diagram of leading edge slat inner segment drainage trough outer face one side outlet; Accompanying drawing 8c is the fore boundary point defining method instruction diagram of outer section drainage trough inner end surface one side outlet of leading edge slat; Accompanying drawing 8d is the fore boundary point defining method instruction diagram of outer section drainage trough outer face one side outlet of leading edge slat.
Accompanying drawing 9a is the rear boundary point defining method instruction diagram of leading edge slat inner segment drainage trough inner end surface one side outlet; Accompanying drawing 9b is the rear boundary point defining method instruction diagram of leading edge slat inner segment drainage trough outer face one side outlet; Accompanying drawing 9c is the rear boundary point defining method instruction diagram of outer section drainage trough inner end surface one side outlet of leading edge slat; Accompanying drawing 9d is the rear boundary point defining method instruction diagram of outer section drainage trough outer face one side outlet of leading edge slat.
Accompanying drawing 10a is the Controlling outline curve generation method instruction diagram of the inner end surface side of cell wall before leading edge slat inner segment drainage trough; Accompanying drawing 10b is the Controlling outline curve generation method instruction diagram of the outer face side of cell wall before leading edge slat inner segment drainage trough; Figure 10 c is the Controlling outline curve generation method instruction diagram of the inner end surface side of cell wall before the outer section drainage trough of leading edge slat; Accompanying drawing 10d is the Controlling outline curve generation method instruction diagram of the outer face side of cell wall before the outer section drainage trough of leading edge slat.
Accompanying drawing 11a is the Controlling outline curve generation method instruction diagram of the inner end surface side exit end of cell wall after leading edge slat inner segment drainage trough; Accompanying drawing 11b is the Controlling outline curve generation method instruction diagram of the outer face side exit end of cell wall after leading edge slat inner segment drainage trough; Accompanying drawing 11c is the Controlling outline curve generation method instruction diagram of the inner end surface side exit end of cell wall after the outer section drainage trough of leading edge slat; Accompanying drawing 11d is the Controlling outline curve generation method instruction diagram of the outer face side exit end of cell wall after the outer section drainage trough of leading edge slat;
Accompanying drawing 12a is the Controlling outline curve generation method instruction diagram of the inner end surface side arrival end of cell wall after leading edge slat inner segment drainage trough; Accompanying drawing 12b is the Controlling outline curve generation method instruction diagram of the outer face side arrival end of cell wall after leading edge slat inner segment drainage trough; Accompanying drawing 12c is the Controlling outline curve generation method instruction diagram of the inner end surface side arrival end of cell wall after the outer section drainage trough of leading edge slat; Accompanying drawing 12d is the Controlling outline curve generation method instruction diagram of the outer face side arrival end of cell wall after the outer section drainage trough of leading edge slat.
Accompanying drawing 13 is effect schematic diagrams that leading edge slat drainage trough improves aircraft stall characteristic;
Accompanying drawing 14 is leading edge slat aircraft flow separated regions without drainage trough;
Accompanying drawing 15 be leading edge slat have drainage trough aircraft flow separated region;
Accompanying drawing 16 are leading edge slats without/have the pressure coefficient of drainage trough to distribute to compare.Wherein:
1. leading edge slat; 2. main wing section; 3. trailing edge flap; 4. drainage trough; 5. leading edge slat slide rail; 6. pulley; 7. drainage trough outlet cover plate; 8. cover plate actuation mechanism; 9. cell wall Controlling outline curve before drainage trough; 10. cell wall Controlling outline curve after drainage trough; 11. leading edge slats are without the lift coefficient curve of drainage trough; 12. leading edge slats have the lift coefficient curve of drainage trough; 13. burbling regions; 14. leading edge slats distribute without the pressure coefficient of drainage trough; 15. leading edge slats have the pressure coefficient of drainage trough to distribute.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, aircraft taking off/landing mission in, adopt the integrated mode of leading edge slat 1, main wing section 2 and trailing edge flap 3, the high lift needed for taking off to obtain/landing.
As shown in accompanying drawing 4 ~ accompanying drawing 6, the leading edge slat of prior art forms by inside and outside two sections, is positioned at the leading edge of a wing also along exhibition to distribution.Leading edge slat drainage trough described in the present embodiment to be positioned on outer section of leading edge slat and through this section of leading edge slat upper surface and lower surface; Described leading edge slat drainage trough is along the exhibition of the leading edge slat at place to distribution.
The leading edge slat 1 being positioned at integrated mode for the drainage trough improving aircraft stall characteristic described in the present embodiment, as shown in accompanying drawing 1, accompanying drawing 2.
Drainage trough 4 described in the present embodiment is along the spanwise arrangement of leading edge slat 1.Setting leading edge slat is inner end surface along exhibition to the end face near wing root one end, and leading edge slat is outer face along exhibition to the end face near wing tip end.Described drainage trough 4 is divided into two sections, be respectively inner segment drainage trough and outer section of drainage trough, be arranged in the both sides of this leading edge slat exhibition to length 1/2 place, wherein: one end of inner segment drainage trough apart from the distance of this leading edge slat inner end surface be the exhibition of this leading edge slat to 5% of length, the other end of inner segment drainage trough is that the exhibition of this leading edge slat is to 2.5% of length apart from the exhibition of this leading edge slat to the distance at length 1/2 place; The outer section of position of drainage trough on this leading edge slat and the positional symmetry of described inner segment drainage trough, namely outer section drainage trough one end apart from the distance of this leading edge slat outer face be the exhibition of this leading edge slat to 5% of length, the other end of outer section of drainage trough is that the exhibition of this leading edge slat is to 2.5% of length apart from the exhibition of this leading edge slat to the distance at length 1/2 place.The arrangement on leading edge slat 1 by described inner segment drainage trough and outer section of drainage trough, this leading edge slat along exhibition to two ends and leading edge slat 1 open up the exhibition respectively remaining with 5% to length 1/2 place and do not arrange drainage trough to length, after ensureing increasing drainage trough, structural strength and the rigidity of leading edge slat still meet design requirement, and reduce additional structural supports parts as much as possible.
The entrance of described drainage trough is positioned on the cavity face of leading edge slat 1 lower surface, so that after leading edge slat 1 packs up, drainage trough entrance can be completely capped, can not be exposed to cruise profile and the cruising flight performance that affect aircraft outside wing.
In the entrance of described drainage trough, actuation mechanism is installed.Described actuation mechanism adopts prior art, is made up of leading edge slat slide rail 5 and pulley 6.Described actuation mechanism is arranged on the leading edge slat of described drainage trough entrance, and near this leading edge slat trailing edge side.
The outlet of described drainage trough is positioned at the upper surface of leading edge slat 1.For ensureing that the air-flow flowing through drainage trough is after the upper surface blowout of leading edge slat 1, can obtain best flowing control effects, the outlet of drainage trough and the upper surface of leading edge slat 1 tangent.
Be designed with drainage trough outlet cover plate 7 in the exit of described drainage trough, so that drainage trough in a non-operative state, its outlet can be closed, and does not destroy aircraft and to cruise profile and cruising flight performance.
Being designed specifically to of described drainage trough outlet cover plate 7: the leading edge slat upper surface covering in cutting drainage trough exit obtains cover plate, and installs hinge at cover plate rear portion, to be hinged to the rear portion of drainage trough outlet, as shown in Figure 3; On leading edge slat, in the leading edge slat back cavity that drainage trough divides, cover plate actuation mechanism 8 is installed, when drainage trough works, cover plate actuation mechanism 8 will drive drainage trough to export cover plate 7 around hinge deflection β angle, thus open drainage trough outlet, meanwhile, lower inclined drainage trough outlet cover plate 7 is using the part as drainage trough geometric shape; When drainage trough does not work, cover plate actuation mechanism 8 drives drainage trough outlet cover plate 7 to reset, and closed drainage groove exports.Described cover plate actuation mechanism 8 is made up of with the start connecting rod being connected steering wheel and cover plate lower surface the aviation small-sized steering machine of prior art.
The present embodiment only illustrates the detailed process of the geometric shape determining described leading edge slat drainage trough for the outer section leading edge slat of aircraft side:
Step 1, determines width and the locus of each entrance of drainage trough.
Setting leading edge slat is inner end surface along exhibition to the end face near wing root side, and leading edge slat is outer face along exhibition to the end face near wing tip side.
Step 1.1: the width determining each entrance of drainage trough.On leading edge slat, extract the leading edge point of this leading edge slat 1 respectively, described leading edge point comprises the leading edge point of inner segment drainage trough and outer section of drainage trough, and specifically inner segment drainage trough is near the leading edge point a at this leading edge slat inner end surface place interior 1with the leading edge point a opened up near this leading edge slat to length 1/2 place interior 2; The outer section of leading edge point a of drainage trough near this leading edge slat outer face place outer 1with the leading edge point a opened up near this leading edge slat to length 1/2 place outer 2.Described leading edge point a interior 1exhibition to position apart from this leading edge slat inner end surface be 5%, described leading edge point a outer 1exhibition to position apart from this leading edge slat outer face be also 5%.Described leading edge point a interior 2exhibition be 2.5% to position apart from the exhibition of this leading edge slat to the distance of length 1/2; Described leading edge point a outer 2exhibition be also 2.5% to position apart from the exhibition of this leading edge slat to the distance of length 1/2.
On this leading edge slat, trailing edge point is extracted according to the method for the leading edge point of described extraction leading edge slat 1.Specifically:
On leading edge slat, extract the trailing edge point of this leading edge slat 1 respectively, described trailing edge point comprises the trailing edge point of inner segment drainage trough and outer section of drainage trough, and specifically inner segment drainage trough is near the trailing edge point b at this leading edge slat inner end surface place interior 1with the trailing edge point b opened up near this leading edge slat to length 1/2 place interior 2; The outer section of trailing edge point b of drainage trough near this leading edge slat outer face place outer 1with the trailing edge point b opened up near this leading edge slat to length 1/2 place outer 2.Described trailing edge point b interior 1exhibition to position apart from this leading edge slat inner end surface be 5%, described trailing edge point b outer 1exhibition to position apart from this leading edge slat outer face be also 5%.Described trailing edge point b interior 2exhibition be 2.5% to position apart from the exhibition of this leading edge slat to the distance of length 1/2; Described trailing edge point b outer 2exhibition be also 2.5% to position apart from the exhibition of this leading edge slat to the distance of length 1/2.
Make the line of described each leading edge point and each trailing edge point respectively, specifically:
Make leading edge point a interior 1with trailing edge point b interior 1line, and this wire length is designated as C interior 1; Make leading edge point a interior 2with trailing edge point b interior 2line, and this wire length is designated as C interior 2.
Make leading edge point a outer 1with trailing edge point b outer 1line, and this wire length is designated as C outer 1; Make leading edge point a outer 2with trailing edge point b outer 2line, and this wire length is designated as C outer 2.
By the line C between each leading edge point of obtaining and each trailing edge point interior 1, C interior 2, C outer 1and C outer 2determine that inner segment drainage trough two ends and outer section of drainage trough two ends are at the width of this leading edge slat along each entrance tangential respectively.Wherein: the width D 1 of inner segment drainage trough inner end surface side interior 1=0.1C interior 1, the width D 1 of inner segment drainage trough outer face side interior 2=0.1C interior 2; The width D 1 of outer section of drainage trough inner end surface side outer 2=0.1C outer 2, the width D 1 of outer section of drainage trough outer face side outer 1=0.1C outer 1.
Step 1.2: the locus determining each entrance of drainage trough.
When determining the locus of each entrance of drainage trough, described leading edge slat should be in full open position during landing.
Determine the lower boundary point of each entrance of inner segment drainage trough:
On the leading edge slat opened completely, with leading edge point a interior 1for starting point is horizontal-extending line L1 interior 1, this L1 interior 1length=0.3C interior 1.At described L1 interior 1destination county do vertical line, and make this vertical line crossing with the lower surface of the leading edge slat be under full open position, obtain intersection point f interior 1; Described f interior 1point is the lower boundary point of inner segment drainage trough inner end surface one side entrance.
On the leading edge slat opened completely, with leading edge point a interior 2for starting point is horizontal-extending line L1 interior 2, this L1 interior 2length=0.3C interior 2.At described L1 interior 2destination county do vertical line, and make this vertical line crossing with the lower surface of the leading edge slat be under full open position, obtain intersection point f interior 2; Described f interior 2point is the lower boundary point of inner segment drainage trough outer face one side entrance
Determine the coboundary point of each entrance of inner segment drainage trough:
Be f interior 1the vertical line of point, this vertical line upwards extends, and at the D1 of this extension line interior 1=0.1C interior 1place makes horizon; The intersection point of described horizon and leading edge slat lower surface is the coboundary point g of inner segment drainage trough inner end surface one side entrance interior 1.
Be f interior 2the vertical line of point, this vertical line upwards extends, and at the D1 of this extension line interior 2=0.1C interior 2place makes horizon; The intersection point of described horizon and leading edge slat lower surface is the coboundary point g of inner segment drainage trough outer face one side entrance interior 2.
Determine the lower boundary point of each entrance of inner segment drainage trough and the method for coboundary point according to described, determine lower boundary point and the coboundary point of the outer section of each entrance of drainage trough, obtain the lower boundary point f of outer section of drainage trough inner end surface one side entrance respectively outer 2, outer section of drainage trough outer face one side entrance lower boundary point f outer 1, outer section of drainage trough inner end surface one side entrance coboundary point g outer 2with the coboundary point g of outer section of drainage trough outer face one side entrance outer 1.
Step 1.3: the entrance determining each drainage trough.
Determine the entrance of inner segment drainage trough:
Connect lower boundary point and the coboundary point of each entrance of inner segment drainage trough obtained respectively: by the lower boundary point f of described inner segment drainage trough inner end surface one side entrance interior 1respectively with the lower boundary point f of straight line and inner segment drainage trough outer face one side entrance interior 2with the coboundary point g of inner segment drainage trough inner end surface one side entrance interior 1connect; By the coboundary point g of described inner segment drainage trough outer face one side entrance interior 2respectively with straight line and inner segment drainage trough near coboundary, inner end surface side point g interior 1with the lower boundary point f of inner segment drainage trough outer face one side entrance interior 2connect.Form quadrangle in space after connecting between described each point, described quadrangle is projected in leading edge slat lower surface, is obtained the border of described inner segment drainage trough entrance by this projection; Boundary line along this projection is cut leading edge slat lower surface, and the otch formed at this wing lower surface is described inner segment drainage trough entrance.
Determine the entrance of outer section of drainage trough:
Determine that the method for the entrance of inner segment drainage trough determines the entrance of outer section of drainage trough according to described.
Step 2, determines the size that drainage trough exports and locus.
Setting leading edge slat is inner end surface along exhibition to the end face near wing root one end, and leading edge slat is outer face along exhibition to the end face near wing tip end.
When determining the locus of each entrance of drainage trough, described leading edge slat should be in full open position during landing.
Step 2.1: determine the fore boundary point that inner segment drainage trough respectively exports: the fore boundary point that described inner segment drainage trough respectively exports comprises the fore boundary point of inner segment drainage trough inner end surface one side outlet and the fore boundary point of inner segment drainage trough outer face one side outlet.
Step 2.1.1: the fore boundary point determining inner segment drainage trough inner end surface one side outlet: on the leading edge slat opened completely, be leading edge point a interior 1with trailing edge point b interior 1between horizontal line, line taking section L2 on this line interior 1, and make this line segment L2 interior 1starting point be leading edge point a interior 1, length=0.12C interior 1.At described line segment L2 interior 1destination county do vertical line, this vertical line is crossing with the upper surface of the leading edge slat be under full open position, obtains intersection point d interior 1; Described d interior 1be the fore boundary point of inner segment drainage trough inner end surface one side outlet.
Step 2.1.2: the fore boundary point determining inner segment drainage trough outer face one side outlet:
On the leading edge slat opened completely, be leading edge point a interior 2with trailing edge point b interior 2between horizontal line, line taking section L2 on this line interior 2, and make this line segment L2 interior 2starting point be leading edge point a interior 2, length=0.12C interior 2.At described L2 interior 2destination county do vertical line, this vertical line is crossing with the upper surface of the leading edge slat be under full open position, obtains intersection point d interior 2; Described d in 2be the fore boundary point of inner segment drainage trough outer face one side outlet.
Step 2.2: determine the rear boundary point that inner segment drainage trough respectively exports: the rear boundary point that described inner segment drainage trough respectively exports comprises the rear boundary point of inner segment drainage trough inner end surface one side outlet and the rear boundary point of inner segment drainage trough outer face one side outlet.
Step 2.2.1: the rear boundary point e determining inner segment drainage trough inner end surface one side outlet interior 1:
On the leading edge slat opened completely, with inner segment drainage trough inner end surface one side outlet fore boundary point d interior 1for starting point, be the extended line D3 of leading edge slat upper surface tangential direction interior 1, this D3 interior 1length=0.24C interior 1, this D3 interior 1bearing of trend be trailing edge point b interior 1place.At described D3 interior 1destination county does the normal of leading edge slat upper surface, and this normal is crossing with leading edge slat upper surface, obtains an e interior 1, intersection point is the rear boundary point e of inner segment drainage trough inner end surface one side outlet interior 1.
Step 2.2.2: the rear boundary point e determining inner segment drainage trough outer face one side outlet interior 2:
On the leading edge slat opened completely, with inner segment drainage trough outer face one side outlet fore boundary point d interior 2for starting point, be the extended line D3 of leading edge slat upper surface tangential direction interior 2, this D3 interior 2length=0.24C interior 2, this D3 interior 2bearing of trend be trailing edge point b interior 2place.At described D3 interior 2destination county does the normal of leading edge slat upper surface, and this normal is crossing with leading edge slat upper surface, obtains an e interior 2, intersection point is the rear boundary point e of inner segment drainage trough outer face one side outlet interior 2.
Described extended line D3 interior 1length be the exit width of inner segment drainage trough inner end surface side; Described extended line D3 interior 2length be the exit width of inner segment drainage trough outer face side.
Step 2.3: determine the fore boundary point that outer section of drainage trough respectively exports and rear boundary point:
According to the method determining the fore boundary point that inner segment drainage trough respectively exports described in step 2.1, determine the fore boundary point of outer section of drainage trough outlet, obtain the fore boundary point d of outer section of drainage trough inner end surface one side outlet respectively outer 2with the fore boundary point d of outer section of drainage trough outer face one side outlet outer 1.Specifically:
On the leading edge slat opened completely, be leading edge point a outer 1with trailing edge point b outer 1between horizontal line, line taking section L2 on this line outer 1, and make this line segment L2 outer 1starting point be leading edge point a outer 1, length=0.12C outer 1.At described line segment L2 outer 1destination county do vertical line, this vertical line is crossing with the upper surface of the leading edge slat be under full open position, obtains intersection point d outer 1; Described d outer 1be the fore boundary point of outer section of drainage trough outer face one side outlet.
On the leading edge slat opened completely, be leading edge point a outer 2with trailing edge point b outer 2between horizontal line, line taking section L2 on this line outer 2, and make this line segment L2 outer 2starting point be leading edge point a outer 2, length=0.12C outer 2.At described L2 outer 2destination county do vertical line, this vertical line is crossing with the upper surface of the leading edge slat be under full open position, obtains intersection point d outer 2; Described d outward 2be the fore boundary point of outer section of drainage trough inner end surface one side outlet.
According to the method determining the rear boundary point that inner segment drainage trough respectively exports described in step 2.2, determine the rear boundary point of outer section of drainage trough outlet, obtain the rear boundary point e of outer section of drainage trough outer face one side outlet respectively outer 1with the rear boundary point e of outer section of drainage trough inner end surface one side outlet outer 2.Specifically:
On the leading edge slat opened completely, with inner segment drainage trough inner end surface one side outlet fore boundary point d outer 1for starting point, be the extended line D3 of leading edge slat upper surface tangential direction outer 1, this D3 outer 1length=0.24C outer 1, this D3 outer 1bearing of trend be trailing edge point b outer 1place.At described D3 outer 1destination county does the normal of leading edge slat upper surface, and this normal is crossing with leading edge slat upper surface, obtains an e outer 1, intersection point is the rear boundary point e of outer section of drainage trough outer face one side outlet outer 1.
On the leading edge slat opened completely, with inner segment drainage trough inner end surface one side outlet fore boundary point d outer 2for starting point, be the extended line D3 of leading edge slat upper surface tangential direction outer 2, this D3 outer 2length=0.24C outer 2, this D3 outer 2bearing of trend be trailing edge point b outer 2place.At described D3 outer 2destination county does the normal of leading edge slat upper surface, and this normal is crossing with leading edge slat upper surface, obtains an e outer 2, intersection point is the rear boundary point e of outer section of drainage trough inner end surface one side outlet outer 2.
Described extended line D3 outer 1length be the exit width of outer section of drainage trough outer face side; Described extended line D3 outer 2length be the exit width of outer section of drainage trough inner end surface side.
Step 2.4: outlet and the drainage trough outlet cover plate 7 of determining each drainage trough:
Step 2.4.1: determine the outlet of inner segment drainage trough and the cover plate of this outlet:
Connect fore boundary point and rear boundary point that the inner segment drainage trough that obtains respectively exports respectively: by the fore boundary point d of described inner segment drainage trough inner end surface one side outlet interior 1respectively with the fore boundary point d of straight line and inner segment drainage trough outer face one side outlet interior 2with the rear boundary point e of inner segment drainage trough inner end surface one side outlet interior 1connect; By the rear boundary point e of described inner segment drainage trough outer face one side outlet interior 2respectively with boundary point e after straight line and inner segment drainage trough inner end surface side interior 1with the fore boundary point d of inner segment drainage trough outer face one side outlet interior 2connect.Quadrangle is formed in space after connecting between described each point.Described quadrangle is projected in leading edge slat upper surface, is obtained the border of described inner segment drainage trough outlet by this projection; Border along this projection is cut leading edge slat upper surface, and the otch formed at this upper surface of the airfoil is the outlet of described inner segment drainage trough, and the leading edge slat upper surface cut down is the outlet cover plate of inner segment drainage trough.
The fore boundary point d of described inner segment drainage trough inner end surface one side outlet interior 1be the fore boundary point of described outlet cover plate.
Step 2.4.2: determine the outlet of outer section of drainage trough and the cover plate of this outlet:
Determine that the method for the outlet of inner segment drainage trough and the cover plate of this outlet determines the outlet of outer section of drainage trough and the cover plate of this outlet according to described.
Step 3, determines the profile of each drainage trough cell wall.The profile of described each drainage trough cell wall comprises both sides cell wall and the outer section of drainage trough both sides cell wall of inner segment drainage trough.
Step 3.1: determine cell wall Controlling outline curve before inner segment drainage trough:
Determine cell wall Controlling outline curve 9 before inner segment drainage trough, this molded line comprises the Controlling outline curve of the outer face side of cell wall before the Controlling outline curve of the inner end surface side of cell wall before inner segment drainage trough and inner segment drainage trough.
Step 3.1.1: the Controlling outline curve deterministic process of the inner end surface side of cell wall before inner segment drainage trough:
On the leading edge slat opened completely, with the fore boundary point d of inner segment drainage trough inner end surface one side outlet interior 1for starting point, do the extended line of leading edge slat upper surface tangential direction, the length of this extended line is 0.05C interior 1, the bearing of trend of this extended line is leading edge point a interior 1place.The terminal of described extended line is the first controlling point i of the inner end surface side Controlling outline curve of front cell wall interior 1.
At leading edge point a interior 1with trailing edge point b interior 1line on, distance leading edge point a interior 1for 0.08C interior 1a j is got at place interior 1, as the second controlling point of the inner end surface side Controlling outline curve of cell wall before inner segment drainage trough.
Make leading edge slat leading edge point a interior 1with sharp beak point z interior 1line, get the mid point of line, and by the mid point of this line and leading edge slat trailing edge point b interior 1connect, be leading edge slat trailing edge point b interior 1with this line mid point and extended line, the intersection point of extended line and leading edge slat lower surface is designated as a h interior 1; Make some h interior 1with the line of leading edge slat trailing edge point, and apart from putting h on line interior 1for 0.08C interior 1a k is got at place interior 1, as the 3rd controlling point of the inner end surface side Controlling outline curve of cell wall before inner segment drainage trough.
Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports interior 1, the first controlling point i interior 1, the second controlling point j interior 1, the 3rd controlling point k interior 1with the lower boundary point f of drainage trough entrance interior 1connect successively, the Controlling outline curve of the inner end surface side of cell wall before acquisition inner segment drainage trough.
Step 3.1.2: the deterministic process of the Controlling outline curve of the outer face side of cell wall before inner segment drainage trough:
On the leading edge slat opened completely, with the fore boundary point d of inner segment drainage trough outer face one side outlet interior 2for starting point, do forward the extended line of leading edge slat upper surface tangential direction, the length of extended line is 0.05C interior 2, this extended line terminal is the first controlling point i of the outer face side Controlling outline curve of front cell wall interior 2.
At leading edge point a interior 2with trailing edge point b interior 2line on, distance leading edge point a interior 2for 0.08C interior 2a j is got at place interior 2, as the second controlling point of the outer face side Controlling outline curve of cell wall before inner segment drainage trough.
Make leading edge slat leading edge point a interior 2with sharp beak point z interior 2line, get the mid point of line, and by the mid point of this line and leading edge slat trailing edge point b interior 2connect, be leading edge slat trailing edge point b interior 2with this line mid point and extended line, the intersection point of extended line and leading edge slat lower surface is designated as a h interior 2; Make some h interior 2with the line of leading edge slat trailing edge point, and apart from putting h on line interior 2for 0.08C interior 2a k is got at place interior 2, as the 3rd controlling point of the outer face side Controlling outline curve of cell wall before inner segment drainage trough.
Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports interior 2, the first controlling point i interior 2, the second controlling point j interior 2, the 3rd controlling point k interior 2with the lower boundary point f of drainage trough entrance interior 2connect successively, the Controlling outline curve of the outer face side of cell wall before acquisition inner segment drainage trough.
So far, before inner segment drainage trough, two Controlling outline curves of cell wall are determined.
Step 3.2: determine cell wall Controlling outline curve after inner segment drainage trough.
After described inner segment drainage trough, cell wall Controlling outline curve 10 comprises the Controlling outline curve of the outer face side of cell wall after the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough and inner segment drainage trough.
Step 3.2.1: first need the deflection angle determining the cover plate that drainage trough exports after determining inner segment drainage trough before cell wall Controlling outline curve 10.
The removable cover of drainage trough outlet is around hinge deflection angle β inaccording to the width average D3 that drainage trough exports at leading edge slat upper surface in=0.5 (D3 interior 1+ D3 interior 2) and this drainage trough outlet average design width D 2 in=0.5 (D2 interior 1+ D2 interior 2) determined by formula (1):
β in=arcsin (D2 in/ D3 in) (1)
In formula, β inunit for degree.
Near the drainage trough outlet of leading edge slat inner end surface design width D 2 interior 1the fore boundary point d exported at leading edge slat upper surface at described inner segment drainage trough interior 1the normal of cell wall after this drainage trough is done at place, and the distance between the fore boundary point that after this normal and drainage trough, the intersection point of cell wall and described leading edge slat upper surface export is drainage trough outlet width D 2 interior 1, D2 interior 1=0.05C interior 1.Near the drainage trough outlet of leading edge slat outer face design width D 2 interior 2the fore boundary point d exported at leading edge slat upper surface at described drainage trough interior 2the normal of cell wall after this drainage trough is done at place, and the distance between the fore boundary point that after this normal and drainage trough, the intersection point of cell wall and described leading edge slat upper surface export is drainage trough outlet width D 2 interior 2, D2 interior 1=0.05C interior 2.
Step 3.2.2: the Controlling outline curve determining the inner end surface side of cell wall after inner segment drainage trough:
After described inner segment drainage trough, the Controlling outline curve of the inner end surface side of cell wall is divided into the Controlling outline curve of inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end.The train spacing point of the Controlling outline curve of described inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end is that the fore boundary point of cover plate deflects β inlocation point behind angle.
Determine the Controlling outline curve of inner segment drainage trough exit end:
The cover plate exported by drainage trough is around hinge deflection angle β in, obtain the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1, described n interior 1the drainage trough outlet fore boundary point d on inner segment drainage trough inner end surface side interior 1position after deflection.Obtain the lateral margin curve of inner segment drainage trough cover plate inner end surface side under deflection state, this lateral margin curve is the Controlling outline curve of inner segment drainage trough exit end simultaneously.The two ends of the Controlling outline curve of described inner segment drainage trough exit end lay respectively at a n interior 1with an e interior 1place.
Determine the Controlling outline curve of inner segment drainage trough arrival end:
First each controlling point of the Controlling outline curve of described inner segment drainage trough arrival end is determined:
With the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1for starting point, to the leading edge point a of leading edge slat interior 1the tangent line of the Controlling outline curve of inner segment drainage trough exit end is done in direction, and this length of tangent degree is 0.1C interior 1; The terminal of this tangent line is the second controlling point of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough, is designated as o interior 1.
At the leading edge point a of leading edge slat interior 1with trailing edge point b interior 1line on, distance leading edge point a interior 1for 0.18C interior 1a l is got at place in 1; Described some l interior 1for the 3rd controlling point of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough.
At a h interior 1with leading edge slat trailing edge point b interior 1line on, apart from some h interior 1for 0.16C interior 1a m is got at place interior 1, described some m interior 1for the 4th controlling point of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough.
Adopt non-uniform rational B-spline, by the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1, the second controlling point o interior 1, the 3rd controlling point l interior 1, the 4th controlling point m interior 1with the coboundary point g of drainage trough entrance interior 1connect successively, obtain non-homogeneous B spline curve.This non-homogeneous B spline curve is the Controlling outline curve of inner segment drainage trough arrival end.The Controlling outline curve of the inner segment drainage trough arrival end obtained is connected with the Controlling outline curve of inner segment drainage trough exit end, obtains the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough.
Step 3.2.3: the Controlling outline curve determining the outer face side of cell wall after inner segment drainage trough:
After described inner segment drainage trough, the Controlling outline curve of the outer face side of cell wall is divided into the Controlling outline curve of inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end.The train spacing point of the Controlling outline curve of described inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end is that the fore boundary point of cover plate deflects β inlocation point behind angle.
Described determine inner segment drainage trough after the method for Controlling outline curve of outer face side of cell wall determine that the method for the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough is identical with described, specifically:
The cover plate exported by drainage trough is around hinge deflection angle β in, obtain the first controlling point n of the outer face side Controlling outline curve of cell wall after inner segment drainage trough interior 2, described n interior 2the drainage trough outlet fore boundary point d on inner segment drainage trough outer face side interior 2position after deflection.Obtain the lateral margin curve of inner segment drainage trough cover plate outer face side under deflection state, this lateral margin curve is the Controlling outline curve of inner segment drainage trough exit end simultaneously.The two ends of the Controlling outline curve of described inner segment drainage trough exit end lay respectively at a n interior 2with an e interior 2place.
Determine the Controlling outline curve of inner segment drainage trough arrival end:
First each controlling point of the Controlling outline curve of described inner segment drainage trough arrival end is determined:
With the first controlling point n of the outer face side Controlling outline curve of cell wall after inner segment drainage trough interior 2for starting point, to the leading edge point a of leading edge slat interior 2the tangent line of the Controlling outline curve of inner segment drainage trough exit end is done in direction, and this length of tangent degree is 0.1C interior 2; The terminal of this tangent line is the second controlling point of the outer face side Controlling outline curve of cell wall after inner segment drainage trough, is designated as o interior 2.
At the leading edge point a of leading edge slat interior 2with trailing edge point b interior 2line on, distance leading edge point a interior 2for 0.18C interior 2a l is got at place in 2; Described some l interior 2for the 3rd controlling point of the outer face side Controlling outline curve of cell wall after inner segment drainage trough.
At a h interior 2with leading edge slat trailing edge point b interior 2line on, apart from some h interior 2for 0.16C interior 2a m is got at place interior 2, described some m interior 2for the 4th controlling point of the outer face side Controlling outline curve of cell wall after inner segment drainage trough.
Adopt non-uniform rational B-spline, by the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 2, the second controlling point o interior 2, the 3rd controlling point l interior 2, the 4th controlling point m interior 2with the coboundary point g of drainage trough entrance interior 2connect successively, obtain non-homogeneous B spline curve.This non-homogeneous B spline curve is the Controlling outline curve of inner segment drainage trough arrival end.The Controlling outline curve of the inner segment drainage trough arrival end obtained is connected with the Controlling outline curve of inner segment drainage trough exit end, obtains the Controlling outline curve of the outer face side of cell wall after inner segment drainage trough.
Step 3.2.4: the spatial form determining inner segment drainage trough:
The profile of the inner segment drainage trough entrance obtained in step 1 is as scanning plane, with the Controlling outline curve of the outer face side of cell wall after the Controlling outline curve of the inner end surface side of cell wall after the Controlling outline curve of the outer face side of cell wall before the Controlling outline curve of the inner end surface side of cell wall before inner segment drainage trough, inner segment drainage trough, inner segment drainage trough, inner segment drainage trough for controlling the Controlling outline curve of inner segment drainage trough spatial form for scanning control line, scan, obtain the spatial form of inner segment drainage trough.The profile of described inner segment drainage trough entrance refers to the profile in leading edge slat lower surface inner segment drainage trough to be cut inlet location.
Step 3.3: determine cell wall Controlling outline curve before outer section of drainage trough:
Determine cell wall Controlling outline curve 9 before outer section of drainage trough, this molded line comprises the Controlling outline curve of the outer face side of cell wall before the Controlling outline curve of the inner end surface side of cell wall before outer section of drainage trough and outer section of drainage trough.
Step 3.3.1: the Controlling outline curve deterministic process of the inner end surface side of cell wall before outer section drainage trough:
On the leading edge slat opened completely, the fore boundary point d of section drainage trough inner end surface one side outlet in addition outer 2for starting point, do the extended line of leading edge slat upper surface tangential direction, the length of this extended line is 0.05C outer 2, the bearing of trend of this extended line is leading edge point a outer 2place.The terminal of described extended line is the first controlling point i of the inner end surface side Controlling outline curve of front cell wall outer 2.
At leading edge point a outer 2with trailing edge point b outer 2line on, distance leading edge point a outer 2for 0.08C outer 2a j is got at place outer 2, as the second controlling point of the inner end surface side Controlling outline curve of cell wall before outer section of drainage trough.
Make leading edge slat leading edge point a outer 2with sharp beak point z outer 2line, get the mid point of line, and by the mid point of this line and leading edge slat trailing edge point b outer 2connect, be leading edge slat trailing edge point b outer 2with this line mid point and extended line, the intersection point of extended line and leading edge slat lower surface is designated as a h outer 2; Make some h outer 2with the line of leading edge slat trailing edge point, and apart from putting h on line outer 2for 0.08C interior 2a k is got at place outer 2, as the 3rd controlling point of the inner end surface side Controlling outline curve of cell wall before outer section of drainage trough.
Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports outer 2, the first controlling point i outer 2, the second controlling point j outer 2, the 3rd controlling point k outer 2with the lower boundary point f of drainage trough entrance outer 2connect successively, obtain the Controlling outline curve of the inner end surface side of cell wall before outer section drainage trough.
Step 3.3.2: the deterministic process of the Controlling outline curve of the outer face side of cell wall before outer section drainage trough:
On the leading edge slat opened completely, the fore boundary point d of section drainage trough outer face one side outlet in addition outer 1for starting point, do forward the extended line of leading edge slat upper surface tangential direction, the length of extended line is 0.05C outer 1, this extended line terminal is the first controlling point i of the outer face side Controlling outline curve of front cell wall outer 1.
At leading edge point a outer 1with trailing edge point b outer 1line on, distance leading edge point a outer 1for 0.08C outer 1a j is got at place outer 1, as the second controlling point of the outer face side Controlling outline curve of cell wall before outer section of drainage trough.
Make leading edge slat leading edge point a outer 1with sharp beak point z outer 1line, get the mid point of line, and by the mid point of this line and leading edge slat trailing edge point b outer 1connect, be leading edge slat trailing edge point b outer 1with this line mid point and extended line, the intersection point of extended line and leading edge slat lower surface is designated as a h outer 1; Make some h outer 1with the line of leading edge slat trailing edge point, and apart from putting h on line interior 2for 0.08C outer 1a k is got at place outer 1, as the 3rd controlling point of the outer face side Controlling outline curve of cell wall before outer section of drainage trough.
Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports outer 1, the first controlling point i outer 1, the second controlling point j outer 1, the 3rd controlling point k outer 1with the lower boundary point f of drainage trough entrance outer 1connect successively, obtain the Controlling outline curve of the outer face side of cell wall before outer section drainage trough.
So far, before outer section of drainage trough, two Controlling outline curves of cell wall are determined.
Step 3.4: determine cell wall Controlling outline curve after outer section of drainage trough.
After described outer section of drainage trough, cell wall Controlling outline curve 10 comprises the Controlling outline curve of the outer face side of cell wall after the Controlling outline curve of the inner end surface side of cell wall after outer section of drainage trough and outer section of drainage trough.
Step 3.4.1: first need the deflection angle determining the cover plate that drainage trough exports before cell wall Controlling outline curve 10 after determining outer section of drainage trough.
The removable cover of drainage trough outlet is around hinge deflection angle β outwardaccording to the width average D3 that outer section of drainage trough exports at leading edge slat upper surface outward=0.5 (D3 outer 1+ D3 outer 2) and this drainage trough outlet average design width D 2 outward=0.5 (D2 outer 1+ D2 outer 2) determined by formula (2):
β outward=arcsin (D2 outward/ D3 outward) (2)
In formula, β outwardunit for degree.
Near the drainage trough outlet of leading edge slat outer face design width D 2 outer 1the fore boundary point d exported at leading edge slat upper surface at described drainage trough outer 1the normal of cell wall after this drainage trough is done at place, and the distance between the fore boundary point that after this normal and drainage trough, the intersection point of cell wall and described leading edge slat upper surface export is drainage trough outlet width D 2 outer 1, D2 outer 1=0.05C outer 1.Near the drainage trough outlet of leading edge slat inner end surface design width D 2 outer 2the fore boundary point d exported at leading edge slat upper surface at described drainage trough outer 2the normal of cell wall after this drainage trough is done at place, and the distance between the fore boundary point that after this normal and drainage trough, the intersection point of cell wall and described leading edge slat upper surface export is drainage trough outlet width D 2 outer 2, D2 outer 1=0.05C outer 2.
Step 3.4.2: the Controlling outline curve determining cell wall outer face side after outer section of drainage trough:
After described outer section drainage trough, the Controlling outline curve of cell wall outer face side is divided into the Controlling outline curve of the Controlling outline curve of outer section of drainage trough exit end and outer section of drainage trough arrival end.The train spacing point of the Controlling outline curve of described outer section of drainage trough exit end and the Controlling outline curve of outer section of drainage trough arrival end is that the fore boundary point of cover plate deflects β outwardlocation point behind angle.
Described determine outer section of drainage trough after the method for Controlling outline curve of cell wall outer face side determine that the method for the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough is identical with described, specifically:
Determine the Controlling outline curve of outer section of drainage trough exit end:
The cover plate exported by drainage trough is around hinge deflection angle β outward, obtain the first controlling point n of cell wall outer face side Controlling outline curve after outer section of drainage trough outer 1, described n outer 1the drainage trough outlet fore boundary point d on outer section of drainage trough outer face side outer 1position after deflection.Obtain the lateral margin curve of inner segment drainage trough cover plate outer face side under deflection state, this lateral margin curve is the Controlling outline curve of outer section of drainage trough exit end simultaneously.The two ends of the Controlling outline curve of described outer section of drainage trough exit end lay respectively at a n outer 1with an e outer 1place.
Determine the Controlling outline curve of outer section of drainage trough arrival end:
First each controlling point of the Controlling outline curve of described outer section of drainage trough arrival end is determined:
First controlling point n of cell wall outer face side Controlling outline curve after section drainage trough in addition outer 1for starting point, to the leading edge point a of leading edge slat outer 1the tangent line of the Controlling outline curve of outer section of drainage trough exit end is done in direction, and this length of tangent degree is 0.1C outer 1; The terminal of this tangent line is the second controlling point of cell wall outer face side Controlling outline curve after outer section of drainage trough, is designated as o outer 1.
At the leading edge point a of leading edge slat outer 1with trailing edge point b outer 1line on, distance leading edge point a outer 1for 0.18C outer 1a l is got at place outward 1; Described some l outer 1for the 3rd controlling point of cell wall outer face side Controlling outline curve after outer section of drainage trough.
At a h outer 1with leading edge slat trailing edge point b outer 1line on, apart from some h outer 1for 0.16C outer 1a m is got at place outer 1, described some m outer 1for the 4th controlling point of cell wall outer face side Controlling outline curve after outer section of drainage trough.
Adopt non-uniform rational B-spline, by the first controlling point n of cell wall outer face side Controlling outline curve after outer section of drainage trough outer 1, the second controlling point o outer 1, the 3rd controlling point l outer 1, the 4th controlling point m outer 1with the coboundary point g of drainage trough entrance outer 1connect successively, obtain non-homogeneous B spline curve.This non-homogeneous B spline curve is the Controlling outline curve of outer section of drainage trough arrival end.The Controlling outline curve of the outer section drainage trough arrival end obtained is connected with the Controlling outline curve of outer section of drainage trough exit end, obtains the Controlling outline curve of cell wall outer face side after outer section of drainage trough.
Step 3.4.3: the Controlling outline curve determining the inner end surface side of cell wall after outer section of drainage trough:
After described outer section drainage trough, the Controlling outline curve of the inner end surface side of cell wall is divided into the Controlling outline curve of the Controlling outline curve of outer section of drainage trough exit end and outer section of drainage trough arrival end.The train spacing point of the Controlling outline curve of described outer section of drainage trough exit end and the Controlling outline curve of outer section of drainage trough arrival end is that the fore boundary point of cover plate deflects β outwardlocation point behind angle.
Described determine outer section of drainage trough after the method for Controlling outline curve of inner end surface side of cell wall determine that the method for the Controlling outline curve of the outer face side of cell wall after inner segment drainage trough is identical with described, specifically:
Determine the Controlling outline curve of outer section of drainage trough exit end:
The cover plate exported by drainage trough is around hinge deflection angle β outward, obtain the first controlling point n of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough outer 2, described n outer 2the drainage trough outlet fore boundary point d on outer section of drainage trough inner end surface side outer 2position after deflection.Obtain the lateral margin curve of inner segment drainage trough cover plate inner end surface side under deflection state, this lateral margin curve is the Controlling outline curve of outer section of drainage trough exit end simultaneously.The two ends of the Controlling outline curve of described outer section of drainage trough exit end lay respectively at a n outer 2with an e outer 2place.
Determine the Controlling outline curve of outer section of drainage trough arrival end:
First each controlling point of the Controlling outline curve of described outer section of drainage trough arrival end is determined:
First controlling point n of the inner end surface side Controlling outline curve of cell wall after section drainage trough in addition outer 2for starting point, to the leading edge point a of leading edge slat outer 2the tangent line of the Controlling outline curve of outer section of drainage trough exit end is done in direction, and this length of tangent degree is 0.1C outer 2; The terminal of this tangent line is the second controlling point of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough, is designated as o outer 2.
At the leading edge point a of leading edge slat outer 2with trailing edge point b outer 2line on, distance leading edge point a outer 2for 0.18C outer 2a l is got at place outward 2; Described some l outer 2for the 3rd controlling point of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough.
At a h outer 2with leading edge slat trailing edge point b outer 2line on, apart from some h outer 2for 0.16C outer 2a m is got at place outer 2, described some m outer 2for the 4th controlling point of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough.
Adopt non-uniform rational B-spline, by the first controlling point n of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough outer 2, the second controlling point o outer 2, the 3rd controlling point l outer 2, the 4th controlling point m outer 2with the coboundary point g of drainage trough entrance outer 2connect successively, obtain non-homogeneous B spline curve.This non-homogeneous B spline curve is the Controlling outline curve of outer section of drainage trough arrival end.The Controlling outline curve of the outer section drainage trough arrival end obtained is connected with the Controlling outline curve of outer section of drainage trough exit end, obtains the Controlling outline curve of the inner end surface side of cell wall after outer section of drainage trough.
Step 3.4.4: the spatial form determining outer section of drainage trough:
The profile of the outer section drainage trough entrance obtained in step 1 is as scanning plane, in addition before section drainage trough before the Controlling outline curve of the inner end surface side of cell wall, outer section of drainage trough after the Controlling outline curve of the outer face side of cell wall, outer section of drainage trough after the Controlling outline curve of the inner end surface side of cell wall, outer section of drainage trough the Controlling outline curve of cell wall outer face side be control inner segment drainage trough spatial form Controlling outline curve for scanning control line, scan, obtain the spatial form of outer section of drainage trough.The profile of described outer section drainage trough entrance refers to the profile in leading edge slat lower surface outer section of drainage trough inlet location to be cut.
So far, the design of drainage trough on leading edge slat in the present embodiment is completed.
The principal character of the leading edge slat of drainage trough that has described in the present embodiment is: on the existing leading edge slat of aircraft, devises one and has certain profile and the narrow drainage trough of the wide outlet of entrance; The air-flow of leading edge slat lower surface is higher due to pressure, therefore can flow to leading edge slat upper surface by drainage trough; Because the wide outlet of drainage trough entrance is narrow, air-flow, in the process flowing through drainage trough, can constantly accelerate, thus forms high-speed jet; Again because drainage trough outlet is tangent with leading edge slat upper surface, the air-flow exporting out from drainage trough can blow out along the tangential direction of leading edge slat upper surface, effectively can blow down the low-yield air-flow that leading edge slat upper surface is piled up, thus reach delay leading edge slat upper surface burbling, improve the aircraft stall angle of attack, relax aircraft stall process, improve the object of aircraft stall characteristic.
Utilizing computational fluid mechanics simulation software, demonstrating the leading edge slat drainage trough of the present embodiment for improving the effect of aircraft stall characteristic.
Can see from accompanying drawing 13 leading edge slat without the lift coefficient curve 11 of drainage trough, when leading edge slat is without drainage trough, certain civil aircraft etc. chord length swept back wing body combination after incoming flow angle of attack=29 °, there occurs stall, and lift declines rapidly after stall, incoming flow angle of attack=30 ° are arrived, without drainage trough lift coefficient C in incoming flow angle of attack=29 ° lloss reaches 23%, makes aircraft lose lift suddenly, seriously will jeopardize flight safety.And leading edge slat has on the lift coefficient curve 12 of drainage trough and can find out, when leading edge slat has a drainage trough, from incoming flow angle of attack=29 ° to incoming flow angle of attack=31 °, lift coefficient C lsubstantially remain unchanged; From incoming flow angle of attack=31 ° to incoming flow angle of attack=32 °, lift coefficient C lalso only loss 2%, the stall process of aircraft is very slow, stalling characteristics be improved significantly, for aviator provides enough stall pre-warning times for changing stall, thus ensured flight safety.
16, accompanying drawing 14 ~ accompanying drawing leading edge slat drainage trough explained described in the present embodiment improves the physical mechanism of aircraft stall characteristic.
From accompanying drawing 14, when leading edge slat is without drainage trough, certain civil aircraft etc. chord length sweepback multi-wall interference when incoming flow angle of attack=30 °, because the air-flow around leading edge slat is separated suddenly, upper surface of the airfoil cover by large-scale low-yield burbling region 13.This low-yield separation bubble will make aircraft lose lift rapidly, thus cause aircraft stall.
Accompanying drawing 15 then shows, when leading edge slat has a drainage trough, same when incoming flow angle of attack=30 °, the former region of burbling on a large scale 13 being covered in upper surface of the airfoil significantly reduces, and burbling region 13 mainly concentrates on the wingtip position of wing, thus ensure that wing major part region all has good attachment flow characteristic, maintain full machine lift substantially constant.
The upper advantage directly embodying drainage trough and postpone leading edge slat burbling of the pressure coefficient distribution of accompanying drawing 16.The low-yield air-flow being originally piled up in leading edge slat upper surface has effectively been blown down just because of the high-speed jet flowing through drainage trough, the circular rector of leading edge slat and aircraft main wing is all obviously increased, lift is recovered, and maintains full machine lift, thus fundamentally improves the stalling characteristics of aircraft.The circular rector of described leading edge slat and aircraft main wing is the area that pressure coefficient Curves surrounds, and the increase of circular rector has the pressure coefficient of drainage trough to distribute without the pressure coefficient distribution 14 of drainage trough and leading edge slat 15 can to find out by comparing leading edge slat.

Claims (8)

1. there is a leading edge slat for drainage trough, it is characterized in that, comprise inner segment drainage trough, outer section of drainage trough and cover plate actuation mechanism; The both sides of this leading edge slat exhibition that is distributed in length 1/2 place that described inner segment drainage trough and outer section of drainage trough are symmetrical respectively, wherein: one end of inner segment drainage trough apart from the distance of this leading edge slat inner end surface be the exhibition of this leading edge slat to 5% of length, the other end of inner segment drainage trough is that the exhibition of this leading edge slat is to 2.5% of length apart from the exhibition of this leading edge slat to the distance at length 1/2 place; One end of outer section of drainage trough apart from the distance of this leading edge slat outer face be the exhibition of this leading edge slat to 5% of length, the other end of outer section of drainage trough is that the exhibition of this leading edge slat is to 2.5% of length apart from the exhibition of this leading edge slat to the distance at length 1/2 place; Described leading edge slat inner end surface is the end face of this leading edge slat along exhibition to close wing root one end, and leading edge slat is end face is that this leading edge slat is along exhibition to the end face near wing tip end.
2. have the leading edge slat of drainage trough as claimed in claim 1, it is characterized in that, the entrance of described inner segment drainage trough and the entrance of outer section of drainage trough are all positioned on the cavity face of leading edge slat lower surface, and before being in the junction of leading edge slat slide rail and main wing section 2.
3. have the leading edge slat of drainage trough as claimed in claim 1, it is characterized in that, the outlet of described inner segment drainage trough and the outlet of outer section of drainage trough are all positioned at the upper surface of leading edge slat, and make the upper surface of the outlet of described each drainage trough and leading edge slat tangent; All there is drainage trough to export cover plate in the exit of described each drainage trough.
4. have the leading edge slat of drainage trough as claimed in claim 3, it is characterized in that, described in be positioned at the outlet of each drainage trough cover plate be that the leading edge slat upper surface covering in cutting drainage trough exit is as this cover plate; The lower surface of described cover plate is provided with actuation mechanism, and when drainage trough works, actuation mechanism will drive cover plate around hinge deflection β ° of angle, open drainage trough outlet; When drainage trough does not work, actuation mechanism drives and is resetted by cover plate, and closed drainage groove exports.
5. design a method for leading edge slat drainage trough described in claim 1, it is characterized in that, detailed process is:
Step 1, determines width and the locus of each entrance of drainage trough;
Setting leading edge slat is inner end surface along exhibition to the end face near wing root side, and leading edge slat is outer face along exhibition to the end face near wing tip side;
Step 1.1: the width determining each entrance of drainage trough;
1 leading edge point and the trailing edge point extracting leading edge slat respectively:
Extract the leading edge point of leading edge slat: described leading edge point comprises the leading edge point of inner segment drainage trough and the leading edge point of outer section of drainage trough; Specifically inner segment drainage trough is near the leading edge point a at this leading edge slat inner end surface place interior 1with the leading edge point a opened up near this leading edge slat to length 1/2 place interior 2; The outer section of leading edge point a of drainage trough near this leading edge slat outer face place outer 1with the leading edge point a opened up near this leading edge slat to length 1/2 place outer 2; Described leading edge point a interior 1exhibition to position apart from this leading edge slat inner end surface be 5%, described leading edge point a outer 1exhibition to position apart from this leading edge slat outer face be also 5%; Described leading edge point a interior 2exhibition be 2.5% to position apart from the exhibition of this leading edge slat to the distance of length 1/2; Described leading edge point a outer 2exhibition be also 2.5% to position apart from the exhibition of this leading edge slat to the distance of length 1/2;
Extract the trailing edge point of leading edge slat: described trailing edge point comprises the trailing edge point of inner segment drainage trough and the trailing edge point of outer section of drainage trough; On this leading edge slat, trailing edge point is extracted according to the method for the leading edge point of described extraction leading edge slat 1;
II line making described each leading edge point and each trailing edge point respectively, specifically:
Make leading edge point a interior 1with trailing edge point b interior 1line and this wire length is designated as C interior 1; Make leading edge point a interior 2with trailing edge point b interior 2line, and this wire length is designated as C interior 2; Make leading edge point a outer 1with trailing edge point b outer 1line, and this wire length is designated as C outer 1; Make leading edge point a outer 2with trailing edge point b outer 2line, and this wire length is designated as C outer 2; By the line C between each leading edge point of obtaining and each trailing edge point interior 1, C interior 2, C outer 1and C outer 2determine that inner segment drainage trough two ends and outer section of drainage trough two ends are at the width of this leading edge slat along each entrance tangential respectively; Wherein: inner segment drainage trough is near the width D 1 of wing root side interior 1=0.1C interior 1, inner segment drainage trough is near the width D 1 of wing tip side interior 2=0.1C interior 2; The width D 1 of outer section of drainage trough near wing root side outer 2=0.1C outer 2, inner segment drainage trough is near the width D 1 of wing tip side outer 1=0.1C outer 1;
Step 1.2: the locus determining each entrance of drainage trough;
When determining the locus of each entrance of drainage trough, described leading edge slat should be in full open position during landing;
Step 1.2.1: the lower boundary point determining each entrance of inner segment drainage trough:
On the leading edge slat opened completely, with leading edge point a interior 1for starting point is horizontal-extending line L1 interior 1, this L1 interior 1length=0.3C interior 1; At described L1 interior 1destination county do vertical line, and make this vertical line crossing with the lower surface of the leading edge slat be under full open position, obtain intersection point f interior 1; Described f interior 1point is the lower boundary point of inner segment drainage trough inner end surface one side entrance;
On the leading edge slat opened completely, with leading edge point a interior 2for starting point is horizontal-extending line L1 interior 2, this L1 interior 2length=0.3C interior 2; At described L1 interior 2destination county do vertical line, and make this vertical line crossing with the lower surface of the leading edge slat be under full open position, obtain intersection point f interior 2; Described f interior 2point is the lower boundary point of inner segment drainage trough outer face one side entrance
Step 1.2.2: the coboundary point determining each entrance of inner segment drainage trough:
Be f interior 1the vertical line of point, this vertical line upwards extends, and at the D1 of this extension line interior 1=0.1C interior 1place makes horizon;
The intersection point of described horizon and leading edge slat lower surface is the coboundary point g of inner segment drainage trough inner end surface one side entrance interior 1;
Be f interior 2the vertical line of point, this vertical line upwards extends, and at the D1 of this extension line interior 2=0.1C interior 2place makes horizon;
The intersection point of described horizon and leading edge slat lower surface is the coboundary point g of inner segment drainage trough outer face one side entrance interior 2;
Step 1.2.3: coboundary point and the lower boundary point of determining the outer section of each entrance of drainage trough:
Determine the lower boundary point of each entrance of inner segment drainage trough and the method for coboundary point according to described, determine lower boundary point and the coboundary point of the outer section of each entrance of drainage trough, obtain the lower boundary point f of outer section of drainage trough inner end surface one side entrance respectively outward 2, outer section of drainage trough outer face one side entrance lower boundary point f outer 1, outer section of drainage trough inner end surface one side entrance coboundary point g outer 2with the coboundary point g of outer section of drainage trough outer face one side entrance outer 1;
Step 1.3: the entrance determining each drainage trough;
Step 1.3.1: the entrance determining inner segment drainage trough:
Connect lower boundary point and the coboundary point of each entrance of inner segment drainage trough obtained respectively: by the lower boundary point f of described inner segment drainage trough inner end surface one side entrance interior 1respectively with the lower boundary point f of straight line and inner segment drainage trough outer face one side entrance interior 2with the coboundary point g of inner segment drainage trough inner end surface one side entrance interior 1connect; By the coboundary point g of described inner segment drainage trough outer face one side entrance interior 2respectively with straight line and inner segment drainage trough near coboundary, inner end surface side point g interior 1with the lower boundary point f of inner segment drainage trough outer face one side entrance interior 2connect; Form quadrangle in space after connecting between described each point, described quadrangle is projected in leading edge slat lower surface, is obtained the border of described inner segment drainage trough entrance by this projection; Boundary line along this projection is cut leading edge slat lower surface, and the otch formed at this wing lower surface is described inner segment drainage trough entrance;
Step 1.3.2: determine outer section of drainage trough entrance:
Determine that the method for the entrance of inner segment drainage trough determines the entrance of outer section of drainage trough according to described;
Step 2, determines the size that each drainage trough exports and locus;
Step 2.1: determine the fore boundary point that inner segment drainage trough respectively exports: the fore boundary point that described inner segment drainage trough respectively exports comprises the fore boundary point of inner segment drainage trough inner end surface one side outlet and the fore boundary point of inner segment drainage trough outer face one side outlet;
Step 2.1.1: the fore boundary point determining inner segment drainage trough inner end surface one side outlet:
On the leading edge slat opened completely, be leading edge point a interior 1with trailing edge point b interior 1between horizontal line, line taking section L2 on this line interior 1, and make this line segment L2 interior 1starting point be leading edge point a interior 1, length=0.12C interior 1; At described line segment L2 interior 1destination county do vertical line, this vertical line is crossing with the upper surface of the leading edge slat be under full open position, obtains intersection point d interior 1; Described d interior 1be the fore boundary point of inner segment drainage trough inner end surface one side outlet;
Step 2.1.2: the fore boundary point determining inner segment drainage trough outer face one side outlet:
On the leading edge slat opened completely, be leading edge point a interior 2with trailing edge point b interior 2between horizontal line, line taking section L2 on this line interior 2, and make this line segment L2 interior 2starting point be leading edge point a interior 2, length=0.12C interior 2; At described L2 interior 2destination county do vertical line, this vertical line is crossing with the upper surface of the leading edge slat be under full open position, obtains intersection point d interior 2; Described d interior 2be the fore boundary point of inner segment drainage trough outer face one side outlet;
Step 2.2: determine the rear boundary point that inner segment drainage trough respectively exports: the rear boundary point that described inner segment drainage trough respectively exports comprises the rear boundary point of inner segment drainage trough inner end surface one side outlet and the rear boundary point of inner segment drainage trough outer face one side outlet;
Step 2.2.1: the rear boundary point e determining inner segment drainage trough inner end surface one side outlet interior 1:
On the leading edge slat opened completely, with inner segment drainage trough inner end surface one side outlet fore boundary point d interior 1for starting point, be the extended line D3 of leading edge slat upper surface tangential direction interior 1, this D3 interior 1length=0.24C interior 1, this D3 interior 1bearing of trend be trailing edge point b interior 1place; At described D3 interior 1destination county does the normal of leading edge slat upper surface, and this normal is crossing with leading edge slat upper surface obtains an e interior 1, intersection point is the rear boundary point e of inner segment drainage trough inner end surface one side outlet interior 1;
D3 allfor the width average that drainage trough exports at leading edge slat upper surface, D3 all=0.5 (D3 outer 1+ D3 outer 2) or=0.5 (D3 interior 1+ D3 interior 2); Described D3 interior 1and D3 outer 2for the width exported at leading edge slat upper surface near the drainage trough of leading edge slat inner end surface; Described D3 outer 1and D3 interior 2for the width exported at leading edge slat upper surface near the drainage trough of leading edge slat outer face;
Step 2.2.2: the rear boundary point e determining inner segment drainage trough outer face one side outlet interior 2:
On the leading edge slat opened completely, with inner segment drainage trough inner end surface one side outlet fore boundary point d interior 2for starting point, be the extended line D3 of leading edge slat upper surface tangential direction interior 2, this D3 interior 2length=0.24C interior 2, this D3 interior 2bearing of trend be trailing edge point b interior 2place; At described D3 interior 2destination county does the normal of leading edge slat upper surface, and this normal is crossing with leading edge slat upper surface obtains an e interior 2, intersection point is the rear boundary point e of inner segment drainage trough outer face one side outlet interior 2;
Step 2.3: determine the fore boundary point that outer section of drainage trough respectively exports and rear boundary point:
According to the method determining the fore boundary point that inner segment drainage trough respectively exports described in step 2.1, determine the fore boundary point that outer section of drainage trough respectively exports, obtain the fore boundary point d of outer section of drainage trough inner end surface one side outlet respectively outer 2with the fore boundary point d of outer section of drainage trough outer face one side outlet outer 1;
According to the method determining the rear boundary point that inner segment drainage trough respectively exports described in step 2.2, determine the rear boundary point of outer section of drainage trough outlet, obtain the rear boundary point e of outer section of drainage trough inner end surface one side outlet respectively outer 2with the rear boundary point e of outer section of drainage trough outer face one side outlet outer 1;
Step 2.4: outlet and the drainage trough outlet cover plate 7 of determining each drainage trough:
Step 2.4.1: determine the outlet of inner segment drainage trough and the cover plate of this outlet:
Connect fore boundary point and rear boundary point that the inner segment drainage trough that obtains respectively exports respectively, make to form quadrangle in space between described fore boundary point each point and rear boundary point each point; Described quadrangle is projected in leading edge slat upper surface, is obtained the border of described inner segment drainage trough outlet by this projection; Boundary line along this projection is cut leading edge slat upper surface, and the otch formed at this upper surface of the airfoil is the outlet of described inner segment drainage trough, and the leading edge slat upper surface cut down is the outlet cover plate of inner segment drainage trough;
The fore boundary point d of described inner segment drainage trough inner end surface one side outlet interior 1be the fore boundary point of described outlet cover plate;
Step 2.4.2: determine the outlet of outer section of drainage trough and the cover plate of this outlet:
Determine that the method for the outlet of inner segment drainage trough and the cover plate of this outlet determines the outlet of outer section of drainage trough and the cover plate of this outlet according to described;
Step 3, determines the profile of each drainage trough cell wall; The profile of described each drainage trough cell wall comprises both sides cell wall and the outer section of drainage trough both sides cell wall of inner segment drainage trough;
Step 3.1: determine cell wall Controlling outline curve before inner segment drainage trough:
Determine cell wall Controlling outline curve before inner segment drainage trough, this molded line comprises the Controlling outline curve of the outer face side of cell wall before the Controlling outline curve of the inner end surface side of cell wall before inner segment drainage trough and inner segment drainage trough;
Step 3.1.1: before determining inner segment drainage trough, the process of the Controlling outline curve of the inner end surface side of cell wall is:
On the leading edge slat opened completely, with the fore boundary point d of inner segment drainage trough inner end surface one side outlet interior 1for starting point, do the extended line of leading edge slat upper surface tangential direction, the length of this extended line is 0.05C interior 1, the bearing of trend of this extended line is leading edge point a interior 1place; The first controlling point i of the inner end surface side Controlling outline curve of cell wall before the terminal of described extended line is interior 1;
At leading edge point a interior 1with trailing edge point b interior 1line on, distance leading edge point a interior 1for 0.08C interior 1a j is got at place interior 1, as the second controlling point of the inner end surface side Controlling outline curve of cell wall before inner segment drainage trough;
Make leading edge slat leading edge point a interior 1with sharp beak point z interior 1line, get the mid point of line, and by the mid point of this line and leading edge slat trailing edge point b interior 1connect, be leading edge slat trailing edge point b interior 1with this line mid point and extended line, the intersection point of extended line and leading edge slat lower surface is designated as a h interior 1; Make some h interior 1with the line of leading edge slat trailing edge point, and apart from putting h on line interior 1for 0.08C interior 1a k is got at place interior 1, as the 3rd controlling point of the inner end surface side Controlling outline curve of cell wall before inner segment drainage trough;
Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports interior 1, the first controlling point i interior 1, the second controlling point j interior 1, the 3rd controlling point k interior 1with the lower boundary point f of drainage trough entrance interior 1connect successively, the Controlling outline curve of the inner end surface side of cell wall before acquisition inner segment drainage trough;
Step 3.1.2: the deterministic process of the Controlling outline curve of the outer face side of cell wall before inner segment drainage trough:
Before determining inner segment drainage trough, with described, the method for the Controlling outline curve of the outer face side of cell wall determines that the Controlling outline curve method of the inner end surface side of cell wall before inner segment drainage trough is identical, obtains the first controlling point i of the outer face side Controlling outline curve of cell wall before inner segment drainage trough respectively interior 2, the second controlling point j interior 2with the 3rd controlling point k interior 2; Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports interior 2, the first controlling point i interior 2, the second controlling point j interior 2, the 3rd controlling point k interior 2with the lower boundary point f of drainage trough entrance interior 2connect successively, the Controlling outline curve of the outer face side of cell wall before acquisition inner segment drainage trough;
So far, before inner segment drainage trough, two Controlling outline curves of cell wall are determined;
Step 3.2: determine cell wall Controlling outline curve after inner segment drainage trough;
After described inner segment drainage trough, cell wall Controlling outline curve comprises the Controlling outline curve of the outer face side of cell wall after the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough and inner segment drainage trough;
Step 3.2.1: the deflection angle determining the cover plate that drainage trough exports;
Step 3.2.2: the Controlling outline curve determining the inner end surface side of cell wall after inner segment drainage trough:
After described inner segment drainage trough, the Controlling outline curve of the inner end surface side of cell wall is divided into the Controlling outline curve of inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end; The train spacing point of the Controlling outline curve of described inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end is that the fore boundary point of cover plate deflects β inlocation point behind angle;
I Controlling outline curve determining inner segment drainage trough exit end:
The cover plate exported by drainage trough is around hinge deflection angle β in, obtain the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1, described n interior 1the drainage trough outlet fore boundary point d on inner segment drainage trough inner end surface side interior 1position after deflection; Obtain the Controlling outline curve of inner segment drainage trough exit end simultaneously; The two ends of the Controlling outline curve of described inner segment drainage trough exit end lay respectively at a n interior 1with an e interior 1place;
II Controlling outline curve determining inner segment drainage trough arrival end:
First each controlling point of the Controlling outline curve of described inner segment drainage trough arrival end is determined:
With the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1for starting point, to the leading edge point a of leading edge slat interior 1the tangent line of the Controlling outline curve of inner segment drainage trough exit end is done in direction, and this length of tangent degree is 0.1C interior 1; The terminal of this tangent line is the second controlling point o of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1;
At the leading edge point a of leading edge slat interior 1with trailing edge point b interior 1line on, distance leading edge point a interior 1for 0.18C interior 1place obtains the 3rd controlling point l of cell wall inner end surface side Controlling outline curve after inner segment drainage trough interior 1;
At a h interior 1with leading edge slat trailing edge point b interior 1line on, apart from some h interior 1for 0.16C interior 1the 4th controlling point m of cell wall inner end surface side Controlling outline curve after inner segment drainage trough is got at place interior 1;
Adopt non-uniform rational B-spline, by the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 1, the second controlling point o interior 1, the 3rd controlling point l interior 1, the 4th controlling point m interior 1with the coboundary point g of drainage trough entrance interior 1connect successively, obtain non-homogeneous B spline curve; This non-homogeneous B spline curve is the Controlling outline curve of inner segment drainage trough arrival end; The Controlling outline curve of the inner segment drainage trough arrival end obtained is connected with the Controlling outline curve of inner segment drainage trough exit end, obtains the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough;
Step 3.2.3: the Controlling outline curve determining the outer face side of cell wall after inner segment drainage trough:
After described inner segment drainage trough, the Controlling outline curve of the outer face side of cell wall is divided into the Controlling outline curve of inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end; The train spacing point of the Controlling outline curve of described inner segment drainage trough exit end and the Controlling outline curve of inner segment drainage trough arrival end is that the fore boundary point of cover plate deflects β inlocation point n behind angle interior 2;
By the Controlling outline curve of the outer face side of cell wall after the method determination inner segment drainage trough of determining the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough described in step 3.2.2, obtain the second controlling point o of the outer face side Controlling outline curve of cell wall after inner segment drainage trough interior 2, the 3rd controlling point l interior 2with the 4th controlling point m interior 2; After inner segment drainage trough, the first controlling point of the outer face side Controlling outline curve of cell wall is the fore boundary point deflection β of cover plate inlocation point n behind angle interior 2;
Adopt non-uniform rational B-spline by the first controlling point n of the inner end surface side Controlling outline curve of cell wall after inner segment drainage trough interior 2, the second controlling point o interior 2, the 3rd controlling point l interior 2, the 4th controlling point m interior 2with the coboundary point g of drainage trough entrance interior 2connect successively, obtain non-homogeneous B spline curve; This non-homogeneous B spline curve is the Controlling outline curve of inner segment drainage trough arrival end; The Controlling outline curve of the inner segment drainage trough arrival end obtained is connected with the Controlling outline curve of inner segment drainage trough exit end, obtains the Controlling outline curve of the outer face side of cell wall after inner segment drainage trough;
Step 3.2.4: the spatial form determining inner segment drainage trough:
The profile of the inner segment drainage trough entrance obtained in step 1 is as scanning plane, with the Controlling outline curve of the outer face side of cell wall after the Controlling outline curve of the inner end surface side of cell wall after the Controlling outline curve of the outer face side of cell wall before the Controlling outline curve of the inner end surface side of cell wall before the inner segment drainage trough obtained, inner segment drainage trough, inner segment drainage trough, inner segment drainage trough for controlling the Controlling outline curve of inner segment drainage trough spatial form for scanning control line, scan, obtain the spatial form of inner segment drainage trough; The profile of described inner segment drainage trough entrance refers to the profile in leading edge slat lower surface inner segment drainage trough to be cut inlet location;
Step 3.3. determines cell wall Controlling outline curve before outer section of drainage trough:
Determine cell wall Controlling outline curve before outer section of drainage trough, this molded line comprises the Controlling outline curve of the outer face side of cell wall before the Controlling outline curve of the inner end surface side of cell wall before outer section of drainage trough and outer section of drainage trough;
Step 3.3.1: the Controlling outline curve deterministic process of the inner end surface side of cell wall before outer section drainage trough:
On the leading edge slat opened completely, the fore boundary point d of section drainage trough inner end surface one side outlet in addition outer 2for starting point, do the extended line of leading edge slat upper surface tangential direction, the length of this extended line is 0.05C outer 2, the bearing of trend of this extended line is leading edge point a outer 2place; The first controlling point i of the inner end surface side Controlling outline curve of cell wall before the terminal of described extended line is outer 2; This controlling point is tangent for the upper surface of the outlet and leading edge slat 1 that ensure drainage trough 4; At leading edge point a outer 2with trailing edge point b outer 2line on, distance leading edge point a outer 2for 0.08C interior 1a j is got at place outer 2, as the second controlling point of the inner end surface side Controlling outline curve of cell wall before outer section of drainage trough;
Make leading edge slat leading edge point a outer 2with sharp beak point z outer 2line, get the mid point of line, and by the mid point of this line and leading edge slat trailing edge point b outer 2connect, be leading edge slat trailing edge point b outer 2with this line mid point and extended line, the intersection point of extended line and leading edge slat lower surface is designated as a h outer 2; Make some h outer 2with the line of leading edge slat trailing edge point, and apart from putting h on line outer 2for 0.08C outer 2a k is got at place outer 2, as the 3rd controlling point of the inner end surface side Controlling outline curve of cell wall before outer section of drainage trough;
Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports outer 2, the first controlling point i outer 2, the second controlling point j outer 2, the 3rd controlling point k outer 2with the lower boundary point f of drainage trough entrance outer 2connect successively, obtain the Controlling outline curve of the inner end surface side of cell wall before outer section drainage trough;
Step 3.3.2: the Controlling outline curve determining the outer face side of cell wall before outer section of drainage trough:
Adopt the method for the Controlling outline curve of the inner end surface side of cell wall before determining outer section of drainage trough described in step 3.3.1 to determine the Controlling outline curve of the outer face side of cell wall before outer section of drainage trough, obtain the first controlling point i of the Controlling outline curve of the outer face side of cell wall before outer section of drainage trough outer 1, the second controlling point j outer 1with the 3rd controlling point k outer 1; Adopt non-uniform rational B-spline, by the fore boundary point d that drainage trough exports outer 1, the first controlling point i outer 1, the second controlling point j outer 1, the 3rd controlling point k outer 1with the lower boundary point f of drainage trough entrance outer 1connect successively, obtain the Controlling outline curve of the outer face side of cell wall before outer section drainage trough;
So far, before outer section of drainage trough, two Controlling outline curves of cell wall are determined;
Step 3.4: determine cell wall Controlling outline curve after outer section of drainage trough;
After described outer section of drainage trough, cell wall Controlling outline curve comprises the Controlling outline curve of the outer face side of cell wall after the Controlling outline curve of the inner end surface side of cell wall after outer section of drainage trough and outer section of drainage trough;
Step 3.4.1: the deflection angle determining the cover plate that drainage trough exports;
Step 3.4.2: the Controlling outline curve determining cell wall outer face side after outer section of drainage trough:
After described outer section drainage trough, the Controlling outline curve of cell wall outer face side is divided into the Controlling outline curve of the Controlling outline curve of outer section of drainage trough exit end and outer section of drainage trough arrival end;
The train spacing point of the Controlling outline curve of described outer section of drainage trough exit end and the Controlling outline curve of outer section of drainage trough arrival end is that the fore boundary point of cover plate deflects β outwardlocation point behind angle;
Described determine outer section of drainage trough after the method for Controlling outline curve of cell wall outer face side determine that the method for the Controlling outline curve of the inner end surface side of cell wall after inner segment drainage trough is identical with described, specifically:
I Controlling outline curve determining outer section of drainage trough exit end:
The cover plate exported by drainage trough is around hinge deflection angle β outward, obtain the first controlling point n of cell wall outer face side Controlling outline curve after outer section of drainage trough outer 1, described n outer 1the drainage trough outlet fore boundary point d on outer section of drainage trough outer face side outer 1position after deflection; Obtain the Controlling outline curve of deflection state lower outside section of drainage trough exit end simultaneously; The two ends of the Controlling outline curve of described outer section of drainage trough exit end lay respectively at a n outer 1with an e outer 1place;
II Controlling outline curve determining outer section of drainage trough arrival end:
Determine the Controlling outline curve of outer section of drainage trough arrival end according to the method for the Controlling outline curve determining inner segment drainage trough arrival end described in step 3.2.2, obtain the second controlling point o of cell wall outer face side Controlling outline curve after outer section of drainage trough outward 1, the 3rd controlling point l outer 1with the 4th controlling point m outer 1; Adopt non-uniform rational B-spline, by the first controlling point n of cell wall outer face side Controlling outline curve after outer section of drainage trough outer 1, the second controlling point o outer 1, the 3rd controlling point l outer 1, the 4th controlling point m outer 1with the coboundary point g of drainage trough entrance outer 1connect successively, obtain non-homogeneous B spline curve; This non-homogeneous B spline curve is the Controlling outline curve of outer section of drainage trough arrival end; The Controlling outline curve of the outer section drainage trough arrival end obtained is connected with the Controlling outline curve of outer section of drainage trough exit end, obtains the Controlling outline curve of cell wall outer face side after outer section of drainage trough;
Step 3.4.3: the Controlling outline curve determining the inner end surface side of cell wall after outer section of drainage trough:
After described outer section drainage trough, the Controlling outline curve of the inner end surface side of cell wall is divided into the Controlling outline curve of the Controlling outline curve of outer section of drainage trough exit end and outer section of drainage trough arrival end; The train spacing point of the Controlling outline curve of described outer section of drainage trough exit end and the Controlling outline curve of outer section of drainage trough arrival end is that the fore boundary point of cover plate deflects β outwardlocation point behind angle;
Described determine outer section of drainage trough after the method for Controlling outline curve of inner end surface side of cell wall determine that the method for the Controlling outline curve of the outer face side of cell wall after inner segment drainage trough is identical with described;
I Controlling outline curve determining outer section of drainage trough exit end:
The cover plate exported by drainage trough is around hinge deflection angle β outward, obtain the first controlling point n of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough outer 2, described n outer 2the drainage trough outlet fore boundary point d on outer section of drainage trough inner end surface side outer 2position after deflection; Obtain the Controlling outline curve of deflection state lower outside section of drainage trough exit end simultaneously; The two ends of the Controlling outline curve of described outer section of drainage trough exit end lay respectively at a n outer 2with an e outer 2place;
II Controlling outline curve determining outer section of drainage trough arrival end:
Determine the Controlling outline curve of outer section of drainage trough arrival end according to the method for the Controlling outline curve determining inner segment drainage trough arrival end described in step 3.2.2, obtain the second controlling point o of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough outer 2, the 3rd controlling point l outer 2with the 4th controlling point m outer 2; Adopt non-uniform rational B-spline, by the first controlling point n of the inner end surface side Controlling outline curve of cell wall after outer section of drainage trough outer 2, the second controlling point o outer 2, the 3rd controlling point l outer 2, the 4th controlling point m outer 2with the coboundary point g of drainage trough entrance outer 2connect successively, obtain non-homogeneous B spline curve; This non-homogeneous B spline curve is the Controlling outline curve of outer section of drainage trough arrival end; The Controlling outline curve of the outer section drainage trough arrival end obtained is connected with the Controlling outline curve of outer section of drainage trough exit end, obtains the Controlling outline curve of the inner end surface side of cell wall after outer section of drainage trough;
Step 3.4.4: the spatial form determining outer section of drainage trough:
The profile of the outer section drainage trough entrance obtained in step 1 is as scanning plane, in addition before section drainage trough before the Controlling outline curve of the inner end surface side of cell wall, outer section of drainage trough after the Controlling outline curve of the outer face side of cell wall, outer section of drainage trough after the Controlling outline curve of the inner end surface side of cell wall, outer section of drainage trough the Controlling outline curve of cell wall outer face side be control inner segment drainage trough spatial form Controlling outline curve for scanning control line, carry out sweeping, obtain the spatial form of outer section of drainage trough; The profile of described outer section drainage trough entrance refers to the profile in leading edge slat lower surface outer section of drainage trough inlet location to be cut;
So far, the design of drainage trough on leading edge slat is completed.
6. design the method for leading edge slat drainage trough described in claim 1 as claimed in claim 5, it is characterized in that, determining that the deflection angle of the cover plate that drainage trough exports is determined by formula (2):
β=arcsin (D2 all/ D3 all) (2)
In formula, the unit of β is degree; D2 allfor the width average of drainage trough outlet, D2 all=0.5 (D2 outer 1+ D2 outer 2) or=0.5 (D2 interior 1+ D2 interior 2); Described D2 interior 1and D2 outer 2for the drainage trough outlet width near leading edge slat inner end surface; Described D2 outer 1and D2 interior 2for the drainage trough outlet width near leading edge slat outer face;
D3 allfor the width average that drainage trough exports at leading edge slat upper surface, D3 all=0.5 (D3 outer 1+ D3 outer 2) or=0.5 (D3 interior 1+ D3 interior 2); Described D3 interior 1and D3 outer 2for the width exported at leading edge slat upper surface near the drainage trough of leading edge slat inner end surface; Described D3 outer 1and D3 interior 2for the width exported at leading edge slat upper surface near the drainage trough of leading edge slat outer face.
7. design the method for leading edge slat drainage trough described in claim 1 as claimed in claim 6, it is characterized in that, the described drainage trough outlet width near leading edge slat outer face is the normal of each drainage trough cell wall after this drainage trough is done at the fore boundary point place that leading edge slat upper surface exports, the distance between the fore boundary point that after this normal and drainage trough, the intersection point of cell wall and described leading edge slat upper surface export.
8. design the method for leading edge slat drainage trough described in claim 1 as claimed in claim 5, it is characterized in that, when the fore boundary point that the inner segment drainage trough that connection obtains respectively exports and rear boundary point, by the fore boundary point d of described inner segment drainage trough inner end surface one side outlet interior 1respectively with the fore boundary point d of straight line and inner segment drainage trough outer face one side outlet interior 2with the rear boundary point e of inner segment drainage trough inner end surface one side outlet interior 1connect; By the rear boundary point e of described inner segment drainage trough outer face one side outlet interior 2respectively with boundary point e after straight line and inner segment drainage trough inner end surface side interior 1with the fore boundary point d of inner segment drainage trough outer face one side outlet interior 2connect.
CN201510083434.7A 2015-02-16 2015-02-16 Leading-edge slat with drainage groove and designing method of drainage groove Pending CN104608919A (en)

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