CN106438047B - The design method of Submerged Inlet internal channel - Google Patents
The design method of Submerged Inlet internal channel Download PDFInfo
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Abstract
The present invention provides a kind of design method of Submerged Inlet internal channel, according to area evolution with distance rule, center line calculates air intake duct internal channel entrance to the semicircle radius changing rule of outlet along the journey regularity of distribution and characteristic variable evolution with distance rule, the fillet part radius change rule of round rectangle, the rectangular elevation changing rule of round rectangle, the changing rule of rectangle width, scan and obtain air intake duct internal channel type face, cross sectional shape is fully taken into account from the not rounded progressively transition to circle, area of section is changed stepwise, effectively increase convenience and the flexibility of such air intake duct internal channel design.
Description
Technical field
The present invention relates to engine inlets technical field, more particularly to a kind of design side of Submerged Inlet internal channel
Method.
Background technology
With the fast development of aeronautical technology, there is inexpensive, high Stealth Fighter, the high subsonic flight of high maneuverability
Device/unmanned plane is paid attention to by more and more national.And the important component as aircraft/UAV Propulsion System is entered
Air flue, the quality of its performance then directly affect the operational performance of aircraft.Therefore the research to air intake duct is most important.
Due to its outstanding Stealth Fighter, Submerged Inlet is just obtaining more next on high subsonic flight device/unmanned plane
More it is widely applied.Submerged Inlet is a kind of by among import embedment fuselage or wing, and any jut is not presented
Special air intake duct.Such Radar Cross Section for being designed to effectively reduce aircraft, so as to preferably stealthy
Performance, simultaneously because its front face area reduces, therefore the frontal resistance of fuselage can be significantly reduced.Among other advantages, due to
Submerged Inlet can be melted into a whole with fuselage, aircraft circumferential size can be made relatively reduced, therefore be advantageous to aircraft
Placement, carrying and canister launch.Many advantages cause Submerged Inlet more and more to be closed by domestic and international researcher above
Note.
But it is completely disposed at just because of the import of Submerged Inlet in the boundary layer of fuselage surface, no image of Buddha tradition
Air intake duct makes full use of incoming punching press air inlet like that, is only capable of lip before relying on and is produced perpendicular to the pressure gradient and incline of direction of flow
Raw vortex air inlet.This allows for Submerged Inlet entrance and has sucked substantial amounts of fuselage boundary layer low energy stream, in internal channel
Pitot loss and air-flow mixing loss it is larger, thus total pressure recovery coefficient is relatively low, and discharge flow distortion is larger.Simultaneously as
Submerged Inlet needs to take into account the aerodynamic configuration of fuselage in the design process, and design constraint is more, surface blending gradient is big.This
Outside, because high subsonic flight device air intake duct requires that length is short, offset distance is big, in order to reduce in inlet mouth air-flow and engine
The influence of longitudinal pressure gradient caused by heart line is not coaxial, the swirl strength needs for reducing exit flow field are reasonable in the design process
Arrange parameter.Factors above all increases the design difficulty of Submerged Inlet.
With reference to figure 1, domestic Guo Rong is big to introduce the general of pneumatic S elbow during DESIGN OF THE SUBMERGED INLET first
Read, the import of pneumatic S elbow 2 is completely disposed in the boundary layer on the surface of fuselage 1, can improve the ram efficiency of air intake duct, make into
The total pressure recovery of air flue improves, and distortion reduces.But in practice, the section of the pneumatic S elbow designed by it is only limitted to track and field race
Road shape and change short axle ellipse.In addition, from the document published, also without the complete design method of air intake duct internal channel,
Characteristic parameter evolution with distance rule on section can not be especially found, therefore the design process of air intake duct can not be completed.
The content of the invention
The brief overview on the present invention is given below, to provide the basic reason on certain aspects of the invention
Solution.It should be appreciated that this general introduction is not the exhaustive general introduction on the present invention.It is not intended to determine the key of the present invention
Or pith, nor is it intended to limit the scope of the present invention.Its purpose only provides some concepts in simplified form, with
This is as the preamble in greater detail discussed later.
To solve the above problems, the present invention proposes a kind of design method of Submerged Inlet internal channel, improve such
The convenience of air intake duct internal channel design and flexibility.
A kind of design method of Submerged Inlet internal channel, the air intake duct internal channel include first etc. be sequentially connected
Straight section, turnaround section and the straight section such as second, the entrance section of the first grade straight section are shaped as the combination of semicircle and round rectangle,
The cross sectional shape of the second grade straight section is circle；
The design method includes：
According to each section of center position parameter in air intake duct internal channel, center line is obtained along journey point using spline function
Cloth rule；
The area of section of the first grade straight section entrance is calculated according to default running parameter, and obtains turnaround section entrance given cross-sectional
Area, turnaround section venturi given cross-sectional area, turnaround section export the straight sections such as given cross-sectional area and second outlet given cross-sectional
Area, the entrance of the air intake duct internal channel is built to the area evolution with distance rule of outlet using spline function；
Calculate the first grade straight section porch, turnaround section porch, at turnaround section venturi, the semicircle in turnaround section exit section
Shape accounts for the area percentage of whole cross section, and the fillet area of round rectangle accounts for the area hundred in whole round rectangle section
Divide ratio, air intake duct internal channel entrance is obtained to the characteristic variable evolution with distance rule of outlet using spline function；
According to the area evolution with distance rule, center line along the journey regularity of distribution and characteristic variable evolution with distance rule meter
Air flue internal channel entrance is added to the semicircle radius changing rule of outlet, the fillet part radius change rule of round rectangle, circle
Rectangular elevation changing rule, the changing rule of rectangle width of angular moment shape, scan and obtain air intake duct internal channel type face.
The design method of Submerged Inlet internal channel provided by the invention, cross sectional shape is fully taken into account from not rounded to circle
The progressively transition of shape, area of section are changed stepwise, and effectively increase the convenience and flexibly of such air intake duct internal channel design
Property.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural relation figure of Submerged Inlet and fuselage.
Fig. 2 is a kind of structural representation of embodiment of Submerged Inlet internal channel provided by the invention.
Fig. 3 is that a kind of section of embodiment of the grade of Submerged Inlet internal channel first straight section entrance provided by the invention is illustrated
Figure.
Fig. 4 is the section signal that the grade of Submerged Inlet internal channel second straight section provided by the invention exports a kind of embodiment
Figure.
The step of Fig. 5 is a kind of embodiment of design method of Submerged Inlet internal channel provided by the invention is schemed.
Fig. 6 is a kind of flow chart of embodiment of design method of Submerged Inlet internal channel provided by the invention.
Fig. 7 is a kind of schematic diagram of embodiment of Submerged Inlet internal channel center line provided by the invention.
Fig. 8 is Submerged Inlet internal channel center line evolution with distance rule schematic diagram provided by the invention.
Fig. 9 is each cross-sectional area schematic diagram of Submerged Inlet internal channel provided by the invention.
Figure 10 is Submerged Inlet internal channel area evolution with distance rule schematic diagram provided by the invention.
Figure 11 be Submerged Inlet internal channel provided by the invention section in semicircle area schematic diagram.
Figure 12 be Submerged Inlet internal channel provided by the invention section in fillet area schematic diagram.
Figure 13 be Submerged Inlet internal channel provided by the invention section in round rectangle area schematic diagram.
Figure 14 is that the semicircle area of Submerged Inlet internal channel provided by the invention accounts for whole cross section area percentage
Evolution with distance rule schematic diagram.
Figure 15 is that the fillet area of Submerged Inlet internal channel provided by the invention accounts for round rectangle area percentage
The evolution with distance rule schematic diagram of ratio.
Embodiment
Illustrate embodiments of the invention with reference to the accompanying drawings.Retouched in the accompanying drawing of the present invention or a kind of embodiment
The element and feature that the element and feature stated can be shown in one or more other accompanying drawings or embodiment are combined.
It should be noted that in order to understand purpose, eliminated in accompanying drawing and explanation known to unrelated to the invention, those of ordinary skill in the art
Part and processing expression and description.
The present embodiment provides a kind of design method of Submerged Inlet internal channel, as shown in Fig. 2 air intake duct internal channel bag
The straight section CD such as the first grade straight section AB, the turnaround section BC and second being sequentially connected are included, as shown in figure 3, the first grade straight section AB entrances
Cross sectional shape be the combination of semicircle and round rectangle, as shown in figure 4, the second grade straight section CD cross sectional shape is circle；
With reference to figure 5 and Fig. 6, design method includes：
Step S101, according to each section of center position parameter in air intake duct internal channel, in being obtained using spline function
Heart line is along the journey regularity of distribution；
Step S102, the area of section of the first grade straight section entrance is calculated according to default running parameter, and is obtained turnaround section and entered
Mouth given cross-sectional area, turnaround section venturi given cross-sectional area, turnaround section export the straight sections such as given cross-sectional area and second and gone out
Mouth given cross-sectional area, the entrance that the air intake duct internal channel is built using spline function are advised to the area evolution with distance of outlet
Rule；
Step S103, calculate the first grade straight section porch, turnaround section porch, at turnaround section venturi, turnaround section exit
The semicircle in section accounts for the area percentage of whole cross section, and the fillet area of round rectangle accounts for whole round rectangle section
The area percentage in face, air intake duct internal channel entrance is obtained to the characteristic variable evolution with distance rule of outlet using spline function；
Step S104, according to the area evolution with distance rule, center line along the journey regularity of distribution and characteristic variable along journey
Changing rule calculates fillet partial radius change of the air intake duct internal channel entrance to the semicircle radius changing rule, round rectangle of outlet
Law, the rectangular elevation changing rule of round rectangle, the changing rule of rectangle width, scan and obtain air intake duct internal channel type
Face.
Submerged Inlet, according to the flight path of aircraft and the requirement of typical cruising condition, selectes typical case in design
Design point, while consider the constraint in terms of physical dimension, thereby determine that the main relevant design parameter of air intake duct.In the present embodiment
In, Design of Inlet point is：Flying height 0km, free stream Mach number 0.7, the angle of attack are 0 °.
The entrance of Submerged Inlet, i.e., the first grade straight section AB entrances, cross sectional shape are the combination of semicircle and round rectangle,
Circle is gradually transition to, the second grade straight section CD cross sectional shape is circle, realizes the slitless connection with engine.
Further, according to each section of center position parameter in air intake duct internal channel, in being obtained using spline function
Heart line is along the journey regularity of distribution.
The design of centre line shape directly influences the aeroperformance of air intake duct.Because the shape of center line determines air-flow
In the deflection situation of air intake duct, in bending channel, for air-flow due to being acted on by inertia force, Flow Field Distribution is uneven, distort compared with
Greatly.Centre line shape is only rationally designed, ensures air intake duct internal channel entrance to smoothly transitting for each kernel of section is exported,
Flow distortion degree can be reduced as far as possible.
In numerical analysis, batten is a kind of special function, there is polynomial pieces definition, is a kind of smooth and each
Also there is the function of certain slickness section junction, it is contemplated that excellent ability of the spline function in terms of geometry molded line is built, and
Successful application in terms of shape design for aerocraft, in the present invention, first extensive use in Computer-aided Geometric Design
Spline method be incorporated into internal channel
With reference to figure 7, the first grade straight section entrance section central point A coordinate informations, the first grade straight section center line and X are obtained respectively
Axle angle α, turnaround section entrance section central point B coordinate informations, the straight section center line such as first are in turnaround section entrance section central point B
Tangent line and X-axis angle β, the central point C coordinate informations of turnaround section outlet, turnaround section center line in turnaround section outlet
Central point C tangent line exists with X-axis angle γ, the straight section outlet central point D coordinate informations such as second, the straight section center line such as second
Second grade straight section outlet central point D tangent line and X-axis angle ψ, under this qualifications, ensure that B points and C points are continuous, protect
Card obtains center line along the journey regularity of distribution using spline function.
As a kind of embodiment, set the first grade straight section entrance section central point A coordinates for (4.7172, -0.46446,
0), turnaround section entrance section central point B coordinates are (5.5774, -0.0993,0), the straight section center line such as first in turnaround section entrance
Kernel of section point B tangent line and X-axis angle α are 23 °, the central point C coordinates of turnaround section outlet for (5.88 ,-
0.042617,0), turnaround section center line turnaround section outlet central point C tangent line and X-axis angle β be 3 °, it is second etc. straight
Section outlet central point D coordinates are (5.93, -0.04,0), the straight section center line such as second in the straight section outlet such as second
Heart point D tangent line is 3 ° with X-axis angle ψ, and obtained center line is as shown in Figure 8 along the journey regularity of distribution.
Further, the first grade straight section inlet area is calculated according to default running parameter, and obtains turnaround section entrance and preset
It is default that area of section, turnaround section venturi given cross-sectional area, turnaround section export the outlet of the straight sections such as given cross-sectional area and second
Area of section, the entrance of the air intake duct internal channel is built to the area evolution with distance rule of outlet using spline function.
The area distributions rule of air intake duct determine flowed in pipe diffusion than change, inappropriate area distributions are plus curved
Triton road interior air-flow is acted on by inertia force, and the flowing in air intake duct is easy to separate.
Default running parameter includes capture flow, discharge coefficient, incoming stagnation pressure, the incoming stagnation temperature of air intake duct, according to entering
The engine behavior that air flue matches, air intake duct capture flow is obtained, according to air intake duct own characteristic, when determining its work
Discharge coefficient, thus calculate the first grade straight section inlet area.
The area of section of first grade straight section entrance is calculated by below equation：
Wherein,Flow, P are captured for air intake duct*For incoming stagnation pressure, T*For incoming stagnation temperature, A is the first grade straight section entrance
Area of section, q are preset flow coefficient, and K is constant, K=0.0404.
Obtain the first grade straight section inlet area, turnaround section entrance given cross-sectional area, turnaround section venturi given cross-sectional area,
Turnaround section exports given cross-sectional area and the second grade straight section outlet given cross-sectional area；
According to the first grade straight section entrance section product, turnaround section entrance section product, turnaround section throatpiston area, turn
The entrance that section discharge area and the second grade straight section discharge area obtain air intake duct internal channel becomes to the area of outlet along journey
Law.
With reference to figure 9, the area of section of the grade straight section of air intake duct first entrance 3 is set as CA3, the default of turnaround section entrance 4 cut
Face area is CA4, turnaround section venturi 5 given cross-sectional area CA5, the given cross-sectional area of turnaround section outlet 6 is CA6, second etc.
The given cross-sectional area of straight section outlet 7 is CA7, the center point coordinate X of respective cross-section is obtained, forms cross-sectional area function CA=f
(X), in the present embodiment, the function meets following condition：
CA3=f (X3)=0.10936m2；
CA4=f (X4)=0.10936m2；
CA5=f (X5)=0.10532m2；
CA6=f (X6)=0.117m2；
CA7=f (X7)=0.117m2；
Wherein, X3For the kernel of section point coordinates of the first grade straight section entrance, X4Sat for the kernel of section point of turnaround section entrance
Mark, X5For the kernel of section point coordinates of turnaround section venturi, X6The kernel of section point coordinates of turnaround section outlet, X7For the second grade straight section
The kernel of section point coordinates of outlet, Figure 10 show each cross-sectional area in centre for meeting above-mentioned condition, being built by spline function
The regularity of distribution.
Further, the first grade straight section porch of calculating, turnaround section porch, the semicircle in turnaround section exit section account for
The area percentage of whole cross section, and the fillet area of round rectangle account for the area percentage in whole round rectangle section
Than obtaining air intake duct internal channel entrance to the characteristic variable evolution with distance rule of outlet using spline function.
The cross sectional shape of first grade straight section entrance is the combination of semicircle and round rectangle, and selected semicircle accounts for whole cross section
Area percentage, and the fillet area of round rectangle account for the area percentage in round rectangle section as characteristic variable,
With reference to figure 11, the semicircle area on section is dash area, and the area percentage that semicircle accounts for whole cross section uses HCAP tables
Show, the ratio of area of its numerical value equal to semicircle ABC and whole entrance section area, the fillet area of round rectangle is determined
Adopted reference chart 12, the rectangular area of round rectangle defines accounts for the percentage of round rectangle area with reference to figure 13, fillet area
Represented using APP, its numerical value be equal to 1/4 circle GOP and 1/4 circle EPD area sum and round rectangle ACDEFG area it
Than.
Structure semicircle accounts for the spline function HCAP=f (X) of the area percentage evolution with distance rule of whole cross section respectively
And the fillet area of round rectangle accounts for the spline function AAP of the area percentage evolution with distance rule in round rectangle section
=g (X), X are the coordinate of respective point on air intake duct internal channel center line.
In the present embodiment, above-mentioned function meets following condition：
HCAP3=f (X3)=0.4417；
HCAP4=f (X4)=0.5；
HCAP6=f (X6)=0.5；
HCAP7=f (X7)=0.5；
AAP3=g (X3)=0.06636；
AAP6=g (X6)=1.0；
AAP7=g (X7)=1.0；
Wherein, X3For the first grade straight section entrance kernel of section point X to coordinate, X4For the kernel of section point X of turnaround section entrance
To coordinate, X6For turnaround section outlet kernel of section point X to coordinate, X7For the outlet of the second grade straight section kernel of section point X to seat
Mark, meets the characteristic variable evolution with distance rule of above-mentioned condition as shown in Figure 14 and Figure 15.
Further, solve air intake duct internal channel entrance to export semicircle radius, round rectangle fillet partial radius,
Rectangular elevation, the rectangle width of round rectangle, obtain its changing rule.
The fillet partial radius of round rectangle is calculated by below equation：
Wherein, r is the fillet partial radius of round rectangle, and CA is the area of respective cross-section, and HCAP is the half of respective cross-section
Circle accounts for the area percentage of whole cross section, and APP is that the fillet area of respective cross-section accounts for the face in whole round rectangle section
Product percentage.
Semicircle radius is calculated by below equation：
Wherein, R is semicircle radius, and CA is the area of respective cross-section, and HCAP is that the semicircle of respective cross-section accounts for whole cross section
Area percentage.
The rectangle width of round rectangle is calculated by below equation：
W=2R；
Wherein, R is semicircle radius, and w is the rectangle width of round rectangle.
The rectangular elevation of round rectangle is calculated according to below equation：
Wherein, h is the rectangular elevation of round rectangle, and r is the fillet partial radius of round rectangle, and CA is the face of respective cross-section
Product, HCAP are that the semicircle of respective cross-section accounts for the area percentage of whole cross section, and w is the rectangle width of round rectangle.
The design method of Submerged Inlet internal channel provided by the invention, smoothly transitting for complex section is completed, protected
The slickness in air inlet channel type face is demonstrate,proved, designing obtained air intake duct internal channel has higher total pressure recovery coefficient and relatively low abnormal
Varying index.
Although the present invention and its advantage is described in detail it should be appreciated that without departing from by appended claim
Various changes, replacement and conversion can be carried out in the case of the spirit and scope of the present invention limited.Moreover, the model of the application
Enclose the process described by specification of being not limited only to, equipment, means, the specific embodiment of method and steps.In the art is common
Technical staff will readily appreciate that from the disclosure, can be used and performed and corresponding reality described herein according to the present invention
Apply the essentially identical function of example or obtain process essentially identical with it result, existing and that future is to be developed, equipment,
Means, method or step.Therefore, appended claim is intended to include such process, equipment, hand in the range of them
Section, method or step.
Claims (9)
1. a kind of design method of Submerged Inlet internal channel, it is characterised in that the air intake duct internal channel includes connecting successively
The first grade straight section for connecing, turnaround section and the straight section such as second, the entrance section of the first grade straight section be shaped as one it is semicircle and
One round rectangle combines, and rectangle only has a fillet wherein at the both ends of a long side, semicircular diameter and rectangle it is another
One long side overlaps, and the cross sectional shape of the second grade straight section is circle；
The design method includes：
According to each section of center position parameter in air intake duct internal channel, center line is obtained using spline function and is distributed rule along journey
Rule；
The area of section of the first grade straight section entrance is calculated according to default running parameter, and obtains turnaround section entrance given cross-sectional face
Product, turnaround section venturi given cross-sectional area, turnaround section export the straight sections such as given cross-sectional area and second outlet given cross-sectional face
Product, the entrance of the air intake duct internal channel is built to the area evolution with distance rule of outlet using spline function；
Calculate the first grade straight section porch, turnaround section porch, at turnaround section venturi, the semicircle in turnaround section exit section accounts for
The area percentage of whole cross section, and the fillet area of round rectangle account for the area percentage in whole round rectangle section
Than obtaining air intake duct internal channel entrance to the characteristic variable evolution with distance rule of outlet using spline function；
According to the area evolution with distance rule, center line along the journey regularity of distribution and characteristic variable evolution with distance rule calculate into
Air flue internal channel entrance to outlet semicircle radius changing rule, the fillet part radius change rule of round rectangle, fillet square
Rectangular elevation changing rule, the changing rule of rectangle width of shape, scan and obtain air intake duct internal channel type face.
2. the design method of Submerged Inlet internal channel according to claim 1, it is characterised in that described according to air inlet
Each section of center position parameter in road internal channel, center line is obtained along the journey regularity of distribution using spline function, including：
The first grade straight section entrance section center point coordinate information, the straight section center line such as first and X-axis angle, turnaround section are obtained respectively
Entrance section center point coordinate information, the straight section center line such as first turnaround section entrance section central point tangent line and X-axis angle,
The center point coordinate information of turnaround section outlet, turnaround section center line turnaround section outlet central point tangent line and X-axis
The straight section such as angle, second outlet center point coordinate information, the straight section center line such as second are in the straight section outlet such as second
The tangent line of heart point and X-axis angle, center line is obtained along the journey regularity of distribution using spline function.
3. the design method of Submerged Inlet internal channel according to claim 1, it is characterised in that first grade is straight
The area of section of section entrance is calculated by below equation：
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<mi>m</mi>
<mo>&CenterDot;</mo>
</mover>
<mo>=</mo>
<mfrac>
<msup>
<mi>P</mi>
<mo>*</mo>
</msup>
<msqrt>
<msup>
<mi>T</mi>
<mo>*</mo>
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<mi>A</mi>
<mo>&CenterDot;</mo>
<mi>q</mi>
<mo>&CenterDot;</mo>
<mi>K</mi>
<mo>;</mo>
</mrow>
Wherein,Flow, P are captured for air intake duct*For incoming stagnation pressure, T*For incoming stagnation temperature, A is the first grade straight section inlet area, q
For preset flow coefficient, K is constant.
4. the design method of Submerged Inlet internal channel according to claim 3, it is characterised in that described to use batten
Function builds the entrance of the air intake duct internal channel to the area evolution with distance rule of outlet, including：
Obtain the area of section, turnaround section entrance given cross-sectional area, turnaround section venturi given cross-sectional face of the first grade straight section entrance
Product, turnaround section export the straight sections such as given cross-sectional area and second outlet given cross-sectional area；
Gone out according to the first grade straight section entrance section product, turnaround section entrance section product, turnaround section throatpiston area, turnaround section
Mouth sectional area and the second grade straight section discharge area establish spline function and obtain the entrance of air intake duct internal channel to the face of outlet
Product evolution with distance rule.
5. the design method of Submerged Inlet internal channel according to claim 1, it is characterised in that described to use batten
Function obtains air intake duct internal channel entrance to the characteristic variable evolution with distance rule of outlet, including：
Calculate the first grade straight section porch, turnaround section porch, the semicircle in turnaround section exit section account for the face of whole cross section
Product percentage, and the fillet area of round rectangle account for the area percentage in round rectangle section, lead to according in air intake duct
The coordinate structure semicircle of respective point on road center line accounts for the spline function and fillet square of the area percentage of whole cross section
The fillet area of shape accounts for the spline function of the area percentage in whole round rectangle section, obtains air intake duct internal channel entrance
To the characteristic variable evolution with distance rule of outlet.
6. the design method of Submerged Inlet internal channel according to claim 1, it is characterised in that the round rectangle
Fillet partial radius calculated by below equation：
<mrow>
<mi>r</mi>
<mo>=</mo>
<msqrt>
<mrow>
<mfrac>
<mn>2</mn>
<mi>&pi;</mi>
</mfrac>
<mo>&CenterDot;</mo>
<mi>C</mi>
<mi>A</mi>
<mo>&CenterDot;</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>H</mi>
<mi>C</mi>
<mi>A</mi>
<mi>P</mi>
<mo>)</mo>
</mrow>
<mo>&CenterDot;</mo>
<mi>A</mi>
<mi>A</mi>
<mi>P</mi>
</mrow>
</msqrt>
<mo>;</mo>
</mrow>
Wherein, r is the fillet partial radius of round rectangle, and CA is the area of respective cross-section, and HCAP is the semicircle of respective cross-section
The area percentage of whole cross section is accounted for, APP is that the fillet area of respective cross-section accounts for the area hundred in whole round rectangle section
Divide ratio.
7. the design method of Submerged Inlet internal channel according to claim 6, it is characterised in that the semicircle radius
Calculated by below equation：
<mrow>
<mi>R</mi>
<mo>=</mo>
<msqrt>
<mrow>
<mfrac>
<mn>2</mn>
<mi>&pi;</mi>
</mfrac>
<mo>&CenterDot;</mo>
<mi>C</mi>
<mi>A</mi>
<mo>&CenterDot;</mo>
<mi>H</mi>
<mi>C</mi>
<mi>A</mi>
<mi>P</mi>
</mrow>
</msqrt>
<mo>;</mo>
</mrow>
Wherein, R is semicircle radius, and CA is the area of respective cross-section, and HCAP is that the semicircle of respective cross-section accounts for the face of whole cross section
Product percentage.
8. the design method of Submerged Inlet internal channel according to claim 7, it is characterised in that the square of round rectangle
Shape width is calculated by below equation：
W=2R；
Wherein, R is semicircle radius, and w is the rectangle width of round rectangle.
9. the design method of Submerged Inlet internal channel according to claim 8, it is characterised in that the round rectangle
Rectangular elevation calculated according to below equation：
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<mi>h</mi>
<mo>=</mo>
<mi>r</mi>
<mo>+</mo>
<mrow>
<mo>(</mo>
<mi>C</mi>
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<mo>(</mo>
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<mi>H</mi>
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<mi>A</mi>
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</mrow>
<mo>)</mo>
<mo>-</mo>
<mfrac>
<mi>&pi;</mi>
<mn>2</mn>
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<mo>&CenterDot;</mo>
<msup>
<mi>r</mi>
<mn>2</mn>
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<mo>-</mo>
<mo>(</mo>
<mrow>
<mi>w</mi>
<mo>-</mo>
<mn>2</mn>
<mo>&CenterDot;</mo>
<mi>r</mi>
</mrow>
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<mi>r</mi>
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</mrow>
Wherein, h is the rectangular elevation of round rectangle, and r is the fillet partial radius of round rectangle, and CA is the area of respective cross-section,
HCAP is that the semicircle of respective cross-section accounts for the area percentage of whole cross section, and w is the rectangle width of round rectangle.
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| CN112591134B (en) * | 2020-12-24 | 2023-03-14 | 中国航空工业集团公司西安飞机设计研究所 | Design method for section of air inlet of nacelle |
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