CN104317982A - Opening straight-flow wind tunnel low-noise design method - Google Patents
Opening straight-flow wind tunnel low-noise design method Download PDFInfo
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- CN104317982A CN104317982A CN201410424990.1A CN201410424990A CN104317982A CN 104317982 A CN104317982 A CN 104317982A CN 201410424990 A CN201410424990 A CN 201410424990A CN 104317982 A CN104317982 A CN 104317982A
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Abstract
The invention discloses an opening straight-flow wind tunnel low-noise design method, which belongs to the technical field of wind tunnel low-noise design. The opening straight-flow wind tunnel low-noise design method is characterized in that a noise reduction piece is installed between a diffusion section and a power section of a wind tunnel, a front fairing is supported on the power section by a front flow deflector, a rear fairing is supported on the power section by a rear flow deflector, a fan is installed between the front fairing and the rear fairing, the lift coefficient of the blades of the fan is less than or equal to 0.5, the front fairing and the rear fairing adopt sound absorption-sound insulation wall design, the rear end of the rear fairing is a venting section, and the venting section adopts sound adsorption wall design. The invention adopts a noise reduction design technology that noise intensity is lowered by starting from a noise source, then, the noise source is isolated, thirdly, noise-abatement equipment is adopted and the sound adsorption wall is adopted for certain positions of cave walls to adsorb parts of noise in airflow is adopted, so that noise can be eliminated from the source, noise generation mechanisms and origins can be fundamentally cut off, and influence on environment by an opening straight-flow wind tunnel is greatly lightened.
Description
Technical field
This patent belongs to wind-tunnel Low-noise Design Technology field, is specifically related to a kind of method for designing of opening direct-action wind tunnel.
Background technology
Opening direct-action wind tunnel is the Special test platform designed for completing helicopter low speed blowing test, its major function carries out the test and study of rotor and helicopter aerodynamics aspect, namely carries out the research of rotor aerodynamic characteristics tests and the experimental study of helicopter Model Selection Scheme.Mainly contain hole body, power system, fan, in compositions such as room (test section), testpieces or testing table, testing apparatus and attitude control systems.Hole body can be divided into inlet plenum, stable section, contraction section, test section, gas collection satin, diffuser, power section and exhaust section to form, and wherein power section is made up of fan and motor and frequency conversion speed-adjusting system etc.Opening direct-action wind tunnel is a kind of device being produced controllable air flow by power system in the body of hole, and the fundamental purpose of building opening direct-action wind tunnel obtains test air-flow that is uniform, that can control at wind regime test section, meets the testing requirements of different rotor.
Summary of the invention
Object of the present invention: provide a kind of opening direct-action wind tunnel Low Noise Design method, adopts the low speed wind regime of the technical program design can greatly reduce the noise of wind regime generation.
Technical scheme of the present invention:
A kind of opening direct-action wind tunnel Low Noise Design method, it is characterized in that, bloop 6 is installed between wind-tunnel diffuser 5 and power section 12, front fairing 7 be supported on by front flow deflector 8 connect in power section 12, rear radome fairing 10 is by provided with fan 9 in rear flow deflector 11 supporting motive force section 12, between front fairing 7 and rear radome fairing 10, lift coefficient≤0.5 of fan 9 blade, front fairing 7 and rear radome fairing 10 adopt the design of sound absorption-sound insulation wall, be exhaust section 13 in rear radome fairing 10 rear end, exhaust section 13 adopts the design of sound absorption wall.
Described bloop 6 is arranged in the form of a ring, and blockage percentage is 30%-32%, and bloop length is 4.5m-5m, and thickness is 150mm-160mm.
Described sound absorption wall is made up of outer hole wall 24, glass fiber blanket C25, bulkhead B26, micropore inwall 27 and aperture outer wall 28, outermost layer is outer hole wall 24, the cotton felt C25 of inside adhering glass, aperture outer wall 28 and micropore inwall 27 successively, inside and outside noise elimination wall, longitudinal through layout bulkhead B26 between hole wall 24 and micropore inwall 27, plays the effect strengthening rigidity.
Thick 1mm-the 1.2mm of described micropore inwall 27, aperture is
percentage of open area is 2.5-3%.
Described sound absorption-sound insulation wall is made up of micropore outer wall 18, middle hole wall 19, real wall 20, glass fiber blanket B21, bulkhead A22 and aperture inwall 23, outermost layer is micropore outer wall 18, inside middle hole wall 19, glass fiber blanket B21, real wall 20, glass fiber blanket B21 and aperture inwall 23 successively, in sound absorption-sound insulation wall, longitudinal through layout bulkhead A22 between micropore outer wall 18 and aperture inwall 23, plays the effect strengthening rigidity.
Thick 1mm-the 1.2mm of micropore outer wall 18 on described sound absorption-sound insulation wall, aperture is
percentage of open area is 2.5-3%; The orifice plate of middle hole wall inner diameter 5mm-5.1mm, percentage of open area is 30-35%; Real wall 20 is thick 8mm-12mm steel plate; Thick 1mm-the 1.2mm of aperture inwall 23, aperture is
percentage of open area is 6-9%; The cotton felt B21 of filling glass between middle hole wall 19 and aperture inwall 23, in order to the noise absorbed and isolation power source produces.This design is adopted to realize the noise that in real wall 20, outside is used in absorption air-flow for double-layer sound-absorption wall.
Described fan 9 inflow velocity, under the maximum running status of opening direct-action wind tunnel, tip speed restriction is no more than 150m/s; The front flow deflector 8 leading edge sweepforward 15-17 ° of fan 9, rear flow deflector 11 leading-edge sweep 15-17 ° of fan, avoids flow deflector overdraught to be separated.
Described Wind Tunnel Contraction employing curvature is the shrinkage curve of bicubic side's curve, and the spread angle of diffuser 5 part hole wall is at 3.5 °-3.8 °; The way that exhaust section 13 adopts segmentation to spread, slows down burbling.
Front flow deflector 8 and rear flow deflector 11 are arranged on before and after fan respectively, front flow deflector 8 is mainly used in supporting front fairing 7 and fan 9 bearing seat, the Main Function of rear flow deflector 11 is the air-flows rotated after guiding fan 9, radome fairing 10 and rectification body and passage after plaing a part to support simultaneously, in order to avoid fan is subject to PERIODIC INTERFERENCE and the noise reduction of flow deflector, the quantity of flow deflector should be odd number.
Technique effect of the present invention: adopt and to start with reduction noise intensity from noise source, secondly noise isolation source, 3rd is adopt noise-abatement equipment and some position of hole wall to adopt sound absorption wall, the noise-reducing design technology absorbing partial noise in air-flow solves the generation of noise from source, fundamentally cut off mechanism and the source of noise generation, greatly reduce the impact of opening direct-action wind tunnel Noise upon Environment.
Accompanying drawing explanation
Fig. 1 opening direct-action wind tunnel low-noise structural composition diagram: inlet plenum 1, stable section 2, contraction section 3, test section 4, diffuser 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 arrangenent diagram of Fig. 2 bloop: bloop 14
Fig. 3 bloop structural representation: microwell plate 15, orifice plate 16, glass fiber blanket A 17;
Fig. 4 sound absorption-sound insulation wall structure schematic diagram: micropore outer wall 18, middle hole wall 19, real wall 20, glass fiber blanket B21, bulkhead A22, aperture inwall 23
Fig. 5 absorbs sound folds in a garment structural representation: outer hole wall 24, glass fiber blanket C25, bulkhead B26, micropore inwall 27, aperture outer wall 28;
Embodiment
The invention of this programme adopts following method for designing to design: a kind of opening direct-action wind tunnel Low Noise Design method, bloop 6 is installed between wind-tunnel diffuser 5 and power section 12, front fairing 7 be supported on by front flow deflector 8 connect in power section 12, rear radome fairing 10 is by provided with fan 9 in rear flow deflector 11 supporting motive force section 12, between front fairing 7 and rear radome fairing 10, lift coefficient≤0.5 of fan 9 blade, front fairing 7 and rear radome fairing 10 adopt the design of sound absorption-sound insulation wall, be exhaust section 13 in rear radome fairing 10 rear end, exhaust section 13 adopts the design of sound absorption wall.
The program is specifically implemented method for designing and is divided into the following aspects:
The noise intensity implementation method of 1 reduction sound source
Fan 9 is the main sound source producing aerodynamic noise, and fan 9 designs according to the requirement of low noise fan 9, design lift coefficient≤0.5 of fan 9 blade, and blade is worked under little inflow angle, ensures that the flowing on blade is not separated; Low fan 9 inflow velocity, under the maximum running status of opening direct-action wind tunnel, tip speed is no more than at 150m/s; The front flow deflector 8 leading edge sweepforward of fan 9, rear flow deflector 11 leading-edge sweep of fan 9, avoids flow deflector overdraught to be separated, and contraction section employing curvature is the shrinkage curve of bicubic side's curve, reduces spread angle, adopts the way of segmentation diffusion, slows down burbling.
2 isolation sound source implementation methods
Radome fairing adopts sound absorption-sound insulation wall, and absorption portion noise also reduces the intensity outwards propagated as far as possible.Centrifugally glass-wool felt B21 is filled, in order to the noise absorbed and isolation power source produces between middle hole wall 19, real wall 20 and aperture inwall 23.For double-layer sound-absorption wall is used for absorbing the noise in air-flow outside real wall 20.
3 noise elimination wall implementation methods
The part hole such as power section 12, diffuser 13 wall of hole body adopts sound absorption wall to absorb pneumatic noise.Innermost layer is stainless steel micropore inwall 27, and micropore inwall 27 sound suppressor formed like this, noise elimination frequency band is wider, better to Low Medium Frequency effect.Be the steel plate outer hole wall 24 of hole body outside aperture outer wall 28, little hole wall 28, fill out with centrifugally glass-wool felt C925 in chamber between outer hole wall 24 and bulkhead B26.The sound suppressor of such formation claims dissipative muffler, and its noise elimination effect is effective to high frequency noise
4 anechoic sheet implementation methods
Anechoic sheet 14 is arranged between diffuser 5 and power section 12, in order to absorb the noise transmitted from power section.Bloop 14 is arranged in the form of a ring, and this structure can be eliminated from medium and 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 arranged on before and after fan 9 respectively, front flow deflector 8 is mainly used in supporting front fairing 7 and fan 9 bearing seat, the Main Function of rear flow deflector is the air-flow rotated after leading straight fan, play a part to support rear radome fairing 10 and passage simultaneously, in order to avoid fan 9 is subject to PERIODIC INTERFERENCE and the noise reduction of rear flow deflector 11, the quantity of flow deflector should be odd number
6 sound absorption-sound insulation wall implementation methods
Be made up of micropore outer wall 18, middle hole wall 19, real wall 20, glass fiber blanket B21, bulkhead A22 and aperture inwall 23, outermost layer is micropore outer wall 18, inside middle hole wall 19, glass fiber blanket B21, real wall 20, glass fiber blanket B21 and aperture inwall 23 successively, longitudinal through layout bulkhead A22 between micropore outer wall 18 and aperture inwall 23 in sound absorption-sound insulation wall, play the effect strengthening rigidity, centrifugally glass-wool felt B21 is filled, in order to the noise absorbed and isolation power source produces between it and the real wall 20 in outside.For double-layer sound-absorption wall is used for absorbing the noise in air-flow outside real wall 20.
Claims (9)
1. an opening direct-action wind tunnel Low Noise Design method, it is characterized in that, bloop (6) is installed between wind-tunnel diffuser (5) and power section (12), front fairing (7) is supported on by front flow deflector (8) and connects in power section (12), rear radome fairing (10) is by rear flow deflector (11) supporting motive force section (12), provided with fan (9) between front fairing (7) and rear radome fairing (10), lift coefficient≤0.5 of fan (9) blade, front fairing (7) and rear radome fairing (10) adopt the design of sound absorption-sound insulation wall, be exhaust section (13) in rear radome fairing (10) rear end, exhaust section (13) adopts the design of sound absorption wall.
2. opening single flow Low Noise Wind Tunnel method for designing according to claim 1, it is characterized in that, described bloop (6) is arranged in the form of a ring, and blockage percentage is 30%-32%, and bloop length is 4.5m-5m, and thickness is 150mm-160mm.
3. opening single flow Low Noise Wind Tunnel method for designing according to claim 1, , describedly to it is characterized in that, described sound absorption wall is by Wai Dongbi (24), glass fiber blanket C (25), bulkhead B (26), micropore inwall (27) and aperture outer wall (28) composition, outermost layer is outer hole wall (24), cotton felt C (25) of inside adhering glass successively, aperture outer wall (28) and micropore inwall (27), longitudinal through layout bulkhead B (26) between hole wall (24) and micropore inwall (27) inside and outside noise elimination wall, play the effect strengthening rigidity.
4. the opening single flow Low Noise Wind Tunnel method for designing according to claim 1 or 3, the thick 1mm-1.2mm of described micropore inwall (27), aperture is
percentage of open area is 2.5-3%.
5. opening single flow Low Noise Wind Tunnel method for designing according to claim 1, , describedly to it is characterized in that, described sound absorption-sound insulation wall is by micropore outer wall (18), middle hole wall (19), real wall (20), glass fiber blanket B (21), bulkhead A (22) and aperture inwall (23) composition, outermost layer is micropore outer wall (18), inside middle hole wall (19) successively, glass fiber blanket B (21), real wall (20), glass fiber blanket B (21) and aperture inwall (23), micropore outer wall (18) in sound absorption-sound insulation wall, and longitudinal through layout bulkhead A (22) between aperture inwall (23), play the effect strengthening rigidity.
6. opening single flow Low Noise Wind Tunnel method for designing according to claim 1, is characterized in that, micropore outer wall (18) thick 1mm-1.2mm on described sound absorption-sound insulation wall, aperture is
percentage of open area is 2.5-3%; The orifice plate of middle hole wall inner diameter 5mm-5.1mm, percentage of open area is 30-35%; Real wall (20) is thick 8mm-12mm steel plate; Aperture inwall (23) thick 1mm-1.2mm, aperture is
percentage of open area is 6-9%; Cotton felt B (21) of filling glass between middle hole wall (19) and aperture inwall (23), in order to the noise absorbed and isolation power source produces.This design is adopted to realize the noise that in real wall (20), outside is used in absorption air-flow for double-layer sound-absorption wall.
7. opening single flow Low Noise Wind Tunnel method for designing according to claim 1, is characterized in that, described fan (9) inflow velocity, and under the maximum running status of opening direct-action wind tunnel, tip speed restriction is no more than 150m/s; Front flow deflector (8) the leading edge sweepforward 15-17 ° of fan (9), rear flow deflector (11) leading-edge sweep 15-17 ° of fan, avoids flow deflector overdraught to be separated.
8. opening single flow Low Noise Wind Tunnel method for designing according to claim 1, is characterized in that, described Wind Tunnel Contraction employing curvature is the shrinkage curve of bicubic side's curve, and the spread angle of diffuser (5) part hole wall is at 3.5 °-3.8 °; Exhaust section (13) adopts the way of segmentation diffusion, slows down burbling.
9. the opening single flow Low Noise Wind Tunnel method for designing according to claim 1 and 7, it is characterized in that, front flow deflector (8) and rear flow deflector (11) are arranged on before and after fan respectively, front flow deflector (8) is mainly used in supporting front fairing (7) and fan (9) bearing seat, the Main Function of rear flow deflector (11) is the air-flow guiding fan (9) to rotate afterwards, radome fairing (10) and rectification body and passage after plaing a part to support simultaneously, in order to avoid fan is subject to PERIODIC INTERFERENCE and the noise reduction of flow deflector, the quantity of flow deflector is odd number.
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Cited By (6)
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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 |
| CN111640412A (en) * | 2020-05-29 | 2020-09-08 | 扬州大学 | Air suction type direct-current low-speed wind tunnel noise reduction processing method |
| CN111912596A (en) * | 2020-07-27 | 2020-11-10 | 西北工业大学 | Small-sized straight-flow wind tunnel diffusion section with ultra-long fairing and annular separation-preventing net |
| CN112613198A (en) * | 2021-03-08 | 2021-04-06 | 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 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111640412A (en) * | 2020-05-29 | 2020-09-08 | 扬州大学 | Air suction type direct-current low-speed wind tunnel noise reduction processing method |
| CN111912596A (en) * | 2020-07-27 | 2020-11-10 | 西北工业大学 | Small-sized straight-flow wind tunnel diffusion section with ultra-long fairing and annular separation-preventing net |
| 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 |
| CN112613198A (en) * | 2021-03-08 | 2021-04-06 | 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 |
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