CN104317982B - A kind of opening direct- action wind tunnel Low Noise Design method - Google Patents
A kind of opening direct- action wind tunnel Low Noise Design method Download PDFInfo
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- CN104317982B CN104317982B CN201410424990.1A CN201410424990A CN104317982B CN 104317982 B CN104317982 B CN 104317982B CN 201410424990 A CN201410424990 A CN 201410424990A CN 104317982 B CN104317982 B CN 104317982B
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Abstract
A kind of opening direct- action wind tunnel Low Noise Design method, belong to wind-tunnel Low-noise Design Technology field, it is characterized in that, bloop is installed between wind-tunnel diffuser and power section, front fairing is supported in power section by front flow deflector, rear radome fairing is supported in power section by rear flow deflector, installs fan between front fairing and rear radome fairing, lift coefficient≤0.5 of fan blade, front fairing and rear radome fairing are using sound absorption-sound insulation wall design, it is exhaust section in rear radome fairing rear end, exhaust section is designed using sound absorption wall.The present invention reduces noise intensity using starting with from noise source, secondly isolation noise source, third is using silencing apparatus and the certain positions of hole wall using sound absorption wall, to absorb the generation that the noise-reducing design technology of partial noise in air-flow solves noise from source, mechanism and the source for fundamentally having cut off noise generation, greatly reduce the influence of opening direct- action wind tunnel Noise upon Environment.
Description
Technical field
This patent belongs to wind-tunnel Low-noise Design Technology field, and in particular to a kind of design side for the direct- action wind tunnel that is open
Method.
Background technique
Opening direct- action wind tunnel is to complete helicopter low speed blowing test and the Special test platform that designs, main function
It can be the test and research in terms of carrying out rotor and helicopter aerodynamics, i.e. progress rotor aerodynamic characteristics tests research and straight
Rise the experimental study of machine Model Selection Scheme.Mainly there is hole body, dynamical system, fan, stay room (test section), testpieces or testing stand, survey
Try the composition such as equipment and attitude control system.Hole body can be divided into inlet plenum, stable section, contraction section, test section, gas collection satin, expansion
Section, power section and exhaust section composition are dissipated, wherein power section is made of fan and motor and frequency conversion speed-adjusting system etc..Opening is straight
Streaming wind-tunnel is a kind of device for generating controllable air flow in the body of hole by dynamical system, builds the main of opening direct- action wind tunnel
Purpose is to obtain test air-flow that is uniform, can control in wind regime test section, meets the test requirements document of different rotors.
Summary of the invention
The purpose of the present invention: a kind of opening direct- action wind tunnel Low Noise Design method is provided, is designed using the technical program
Low speed wind regime can greatly reduce wind regime generation noise.
Technical solution of the present invention:
A kind of opening direct- action wind tunnel Low Noise Design method, which is characterized in that wind-tunnel diffuser 5 and power section 12 it
Between install bloop 6, front fairing 7 is supported in power section 12 by front flow deflector 8, rear radome fairing 10 is supported by rear flow deflector 11
In power section 12, fan 9 is installed between front fairing 7 and rear radome fairing 10, lift coefficient≤0.5 of 9 blade of fan is preceding whole
Stream cover 7 and rear radome fairing 10 are exhaust section 13 in rear 10 rear end of radome fairing, exhaust section 13 uses using sound absorption-sound insulation wall design
Sound absorption wall design.
Annularly arrangement, blockage percentage 30%-32%, noise reduction leaf length are 4.5m -5m to the bloop 6, with a thickness of
150mm—160mm。
The sound absorption wall is by outer hole wall 24, third blanket of glass wool 25, the second bulkhead 26, micropore inwall 27 and aperture outer wall 28
Composition, outermost layer are outer hole wall 24, are successively inwardly bonded third blanket of glass wool 25, aperture outer wall 28 and micropore inwall 27, are inhaling
The second bulkhead 26 of longitudinally through arrangement between outer hole wall 24 and micropore inwall 27 in sound wall plays the role of reinforcing rigidity.
The 27 thickness 1mm -1.2mm of micropore inwall, aperture isPercent opening is 2.5-
3%.
Sound absorption-the sound insulation wall is by micropore outer wall 18, middle hole wall 19, solid wall 20, the second blanket of glass wool 21, the first bulkhead 22
And aperture inner wall 23 form, outermost layer be micropore outer wall 18, successively inside middle hole wall 19, the second blanket of glass wool 21, solid wall 20,
Second blanket of glass wool 21 and aperture inner wall 23, in sound absorption-sound insulation wall between micropore outer wall 18 and aperture inner wall 23 it is longitudinally through
It arranges the first bulkhead 22, plays the role of reinforcing rigidity.
18 thickness 1mm -1.2mm of micropore outer wall on the sound absorption-sound insulation wall, aperture is It opens
Porosity is 2.5-3%；The orifice plate of middle hole wall inner diameter 5mm-5.1mm, percent opening 30-35%,；Solid wall 20 is thickness 8mm-
12mm steel plate；23 thickness 1mm -1.2mm of aperture inner wall, aperture isPercent opening is 6-9%；Mesoporous
The second blanket of glass wool 21 is filled between wall 19 and aperture inner wall 23, to absorb and be isolated the noise of power source generation, using this
Design realizes that outside is that double-layer sound-absorption wall is used to absorb the noise in air-flow in solid wall 20.
9 inflow velocity of fan, under the direct- action wind tunnel maximum operating status that is open, tip speed limitation is no more than
150m/s；8 15-17 ° of the leading edge sweepforward of front flow deflector of fan 9,15-17 ° of 11 leading-edge sweep of rear flow deflector of fan avoid leading
Flow overdraught separates.
The Wind Tunnel Contraction uses curvature for the shrinkage curve of double cubic curve, the diffusion of 5 part hole wall of diffuser
Angle is at 3.5 ° -3.8 °；Exhaust section 13 slows down air-flow separation using the method for segmentation diffusion.
Front flow deflector 8 and rear flow deflector 11 are separately mounted to before and after fan, and front flow deflector 8 is mainly used for supporting front fairing
7 and 9 bearing block of fan, the main function of rear flow deflector 11 is to guide the air-flow rotated after fan 9, while playing radome fairing after support
10 and rectification body and channel effect, in order to avoid fan is by the PERIODIC INTERFERENCE and noise reduction of flow deflector, the quantity of flow deflector is answered
For odd number.
Technical effect of the invention: noise intensity is reduced using starting with from noise source, noise source is secondly isolated, third is to adopt
Sound absorption wall is used with silencing apparatus and the certain positions of hole wall, to absorb the noise-reducing design technology of partial noise in air-flow from source
It solves the generation of noise, has fundamentally cut off mechanism and the source of noise generation, greatly reduce opening direct- action wind tunnel and make an uproar
Influence of the sound to environment.
Detailed description of the invention
Fig. 1 opening direct- action wind tunnel low-noise structural composition figure: inlet plenum 1, contraction section 3, test section 4, expands stable section 2
Dissipate section 5, bloop 6, front fairing 7, front flow deflector 8, fan 9, rear radome fairing 10, rear flow deflector 11, power section 12, exhaust section
13
The layout drawing of Fig. 2 bloop: bloop 14
Fig. 3 bloop structural schematic diagram: microwell plate 15, orifice plate 16, the first blanket of glass wool 17；
Fig. 4 sound absorption-sound insulation wall structure schematic diagram: micropore outer wall 18, middle hole wall 19, solid wall 20, the second blanket of glass wool 21, first
Bulkhead 22, aperture inner wall 23
Fig. 5 absorbs sound folds in a garment structural schematic diagram: outer hole wall 24, third blanket of glass wool 25, the second bulkhead 26, micropore inwall 27, small
Outer wall of hole 28；
Specific embodiment
The invention of this programme is designed using following design method: a kind of opening direct- action wind tunnel Low Noise Design side
Method installs bloop 6 between wind-tunnel diffuser 5 and power section 12, and front fairing 7 is supported on power section 12 by front flow deflector 8
Upper, rear radome fairing 10 is supported in power section 12 by rear flow deflector 11, installs fan 9 between front fairing 7 and rear radome fairing 10,
Lift coefficient≤0.5 of 9 blade of fan, front fairing 7 and rear radome fairing 10 are using sound absorption-sound insulation wall design, in rear radome fairing
10 rear ends are exhaust section 13, and exhaust section 13 is designed using sound absorption wall.
Program specific implementation design method is divided into the following aspects:
1 reduces the noise intensity implementation method of sound source
Fan 9 is the main sound source for generating aerodynamic noise, and fan 9 is designed according to the requirement of low noise fan 9, fan
Design lift coefficient≤0.5 of 9 blades makes blade work under little inflow angle, guarantees that the flowing on blade does not separate；It is low
9 inflow velocity of fan, under the direct- action wind tunnel maximum operating status that is open, tip speed be no more than in 150m/s；Fan 9
8 leading edge sweepforward of front flow deflector, 11 leading-edge sweep of rear flow deflector of fan 9, avoids flow deflector overdraught from separating, contraction section is adopted
It is the shrinkage curve of double cubic curve with curvature, reduces angle of flare, using the method for segmentation diffusion, slows down air-flow separation.
2 isolation sound source implementation methods
Radome fairing uses sound absorption-sound insulation wall, absorbs partial noise and reduces the intensity propagated outward to the greatest extent.Middle hole wall 19,
The second blanket of glass wool 21 of filling centrifugation between solid wall 20 and aperture inner wall 23, to absorb and be isolated the noise of power source generation.
It is used to absorb the noise in air-flow for double-layer sound-absorption wall on the outside of solid wall 20.
3 sound absorption wall implementation methods
The parts hole walls such as the power section 12 of hole body, diffuser 13 absorb pneumatic noise using sound absorption wall.Innermost layer is stainless
Steel micropore inwall 27,27 silencer of micropore inwall constituted in this way, noise elimination frequency band is wider, preferable to Low Medium Frequency effect.In aperture
It is the steel plate outer hole wall 24 of hole body on the outside of outer wall 28, it is intracavitary between small hole wall 28, outer hole wall 24 and the second bulkhead 26 to fill out to be centrifuged
Third blanket of glass wool 925.The silencer constituted in this way claims dissipative muffler, its noise elimination effect is good to high-frequency noise effect
4 anechoic sheet implementation methods
Anechoic sheet 14 is mounted between diffuser 5 and power section 12, to absorb the noise transmitted from power section.Bloop
14 arrangements annular in shape, this structure can eliminate therefrom low frequency to the noise within the scope of high frequency broad frequency band.
5 flow deflector implementation methods
Front flow deflector 8 and rear flow deflector 11 are separately mounted to 9 front and back of fan, and front flow deflector 8 is mainly used for supporting preceding rectification
Cover 7 and 9 bearing block of fan, the main function of rear flow deflector are to lead the air-flow rotated after straight fan, while playing radome fairing after support
10 and channel effect, in order to avoid fan 9 is by the PERIODIC INTERFERENCE and noise reduction of rear flow deflector 11, the quantity of flow deflector should be odd
Number
6 sound absorptions-sound insulation wall implementation method
By micropore outer wall 18, middle hole wall 19, solid wall 20, the second blanket of glass wool 21, the first bulkhead 22 and aperture inner wall 23
Composition, outermost layer are micropore outer wall 18, successively inside middle hole wall 19, the second blanket of glass wool 21, solid wall 20, the second blanket of glass wool 21
And aperture inner wall 23, in the first bulkhead of longitudinally through arrangement between micropore outer wall 18 and aperture inner wall 23 in sound absorption-sound insulation wall
22, play the role of reinforce rigidity, it filled the solid wall 20 in outside between is centrifuged the second blanket of glass wool 21, to absorb and every
The noise generated from power source.It is used to absorb the noise in air-flow for double-layer sound-absorption wall on the outside of solid wall 20.
Claims (7)
1. a kind of opening direct- action wind tunnel Low Noise Design method, which is characterized in that in wind-tunnel diffuser (5) and power section (12)
Between install bloop (6), front fairing (7) is supported on power section (12) by front flow deflector (8), rear radome fairing (10) is by rear
Flow deflector (11) is supported on power section (12), installs fan (9) between front fairing (7) and rear radome fairing (10), fan (9)
Lift coefficient≤0.5 of blade, front fairing (7) and rear radome fairing (10) are using sound absorption-sound insulation wall design, in rear radome fairing
(10) rear end is exhaust section (13), and exhaust section (13) is designed using sound absorption wall；
The sound absorption wall by outer hole wall (24), third blanket of glass wool (25), the second bulkhead (26), micropore inwall (27) and aperture outside
Wall (28) composition, outermost layer are outer hole wall (24), are successively inwardly bonded third blanket of glass wool (25), aperture outer wall (28) and micropore
Inner wall (27), the second bulkhead of longitudinally through arrangement (26), is played between outer hole wall in sound absorption wall (24) and micropore inwall (27)
Reinforce the effect of rigidity；
Sound absorption-the sound insulation wall by micropore outer wall (18), middle hole wall (19), solid wall (20), the second blanket of glass wool (21), first every
Frame (22) and aperture inner wall (23) composition, outermost layer are micropore outer wall (18), successively inside middle hole wall (19), the second mineral wool
Felt (21), solid wall (20), the second blanket of glass wool (21) and aperture inner wall (23), in sound absorption-sound insulation wall micropore outer wall (18) and
The first bulkhead of longitudinally through arrangement (22) between aperture inner wall (23) plays the role of reinforcing rigidity.
2. opening direct- action wind tunnel Low Noise Design method according to claim 1, which is characterized in that the bloop
(6) arrangement annular in shape, blockage percentage 30%-32%, noise reduction leaf length is 4.5m -5m, with a thickness of 150mm -160mm.
3. opening direct- action wind tunnel Low Noise Design method according to claim 1, micropore inwall (27) thickness 1mm-
1.2mm, apertureFor 0.8mm-1.1mm, percent opening is 2.5-3%.
4. opening direct- action wind tunnel Low Noise Design method according to claim 1, which is characterized in that it is described sound absorption-every
Micropore outer wall (18) thickness 1mm -1.2mm, aperture on sound wallFor 0.8mm-1.1mm, percent opening is 2.5-3%；In middle hole wall
The orifice plate of wall diameter 5mm-5.1mm, percent opening 30-35%；Solid wall (20) is thickness 8mm -12mm steel plate；Aperture inner wall (23)
Thick 1mm -1.2mm, apertureFor 1.1mm-1.3mm, percent opening is 6-9%；Between middle hole wall (19) and aperture inner wall (23)
The second blanket of glass wool (21) are filled, to absorb and be isolated the noise of power source generation, are realized in solid wall (20) using the design
Outside is that double-layer sound-absorption wall is used to absorb the noise in air-flow.
5. opening direct- action wind tunnel Low Noise Design method according to claim 1, which is characterized in that the fan (9)
Inflow velocity, under the direct- action wind tunnel maximum operating status that is open, tip speed limitation is no more than 150m/s；Before fan (9)
15-17 ° of leading edge sweepforward of flow deflector (8), 15-17 ° of leading-edge sweep of the rear flow deflector (11) of fan avoid flow deflector overdraught from sending out
It is estranged from.
6. opening direct- action wind tunnel Low Noise Design method according to claim 1, which is characterized in that Wind Tunnel Contraction is adopted
It is the shrinkage curve of double cubic curve with curvature, the angle of flare of diffuser (5) part hole wall is at 3.5 ° -3.8 °；Exhaust section
(13) method for using segmentation diffusion slows down air-flow separation.
7. opening direct- action wind tunnel Low Noise Design method according to claim 1, which is characterized in that front flow deflector (8)
Before and after being separately mounted to fan with rear flow deflector (11), front flow deflector (8) is used to support front fairing (7) and fan (9) bearing
Seat, the effect of rear flow deflector (11) is the air-flow for guiding fan (9) to rotate afterwards, while playing radome fairing (10) and rectification body after support
With the effect in channel, in order to avoid fan is by the PERIODIC INTERFERENCE and noise reduction of flow deflector, the quantity of flow deflector is odd number.
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| CN201410424990.1A CN104317982B (en) | 2014-08-26 | 2014-08-26 | A kind of opening direct- action wind tunnel Low Noise Design method |
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| CN201410424990.1A CN104317982B (en) | 2014-08-26 | 2014-08-26 | A kind of opening direct- action wind tunnel Low Noise Design method |
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| CN104317982B true CN104317982B (en) | 2018-12-11 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110095636A (en) * | 2019-05-27 | 2019-08-06 | 山东省气象局大气探测技术保障中心 | A kind of meteorological circuit wind tunnel system |
| CN111640412B (en) * | 2020-05-29 | 2023-07-18 | 扬州大学 | Noise reduction processing method for air suction type direct-current low-speed wind tunnel |
| CN111912596B (en) * | 2020-07-27 | 2022-06-07 | 西北工业大学 | Small-sized straight-flow wind tunnel diffusion section with ultra-long fairing and annular separation-preventing net |
| CN112613198B (en) * | 2021-03-08 | 2021-05-11 | 中国空气动力研究与发展中心低速空气动力研究所 | Data processing method for removing interference of wind tunnel fan |
| CN113899522A (en) * | 2021-09-30 | 2022-01-07 | 中国航空工业集团公司哈尔滨空气动力研究所 | Noise elimination device for large-scale low-speed wind tunnel gradual change circular pipeline |
| CN114252229A (en) * | 2021-12-20 | 2022-03-29 | 中国航空工业集团公司哈尔滨空气动力研究所 | Similar wing section wind tunnel noise elimination corner flow deflector |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2665841Y (en) * | 2003-11-13 | 2004-12-22 | 杜江 | Weightlessness simulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2665841Y (en) * | 2003-11-13 | 2004-12-22 | 杜江 | Weightlessness simulator |
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| Title |
|---|
| 多点静压落差法在风洞稳速压控制系统中的分析与应用;易晖等;《直升机技术》;20130430(第4期);第60-67页 * |
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