流管侧向微缝共振器的声学特性

戴习文; 景晓东; 孙晓峰

流管侧向微缝共振器的声学特性

北京航空航天大学能源与动力工程学院,北京 100191

基金项目: 国家自然科学基金(50890181,51076005); 航空基金(2009ZB51)

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出版历程
- 收稿日期: 2010-11-10
- 修回日期: 2011-05-13
- 刊出日期: 2011-06-28

Acoustic properties of a slit resonator attached to a pipe with flow

School of Jet Propulsion, Beijing University of Aeronautics and Astronautics,Beijing 100191,China

摘要

摘要: 为研究有流动管道侧向微缝共振器的声学特性,基于离散涡方法建立了一个理论模型.管道安装共振器处利用质量和动量守恒建立间断条件,再结合离散涡模型,计算出共振器的声阻抗和吸声系数.数值模拟表明微缝处流场主要取决于脱落涡层的卷起和拍动,这与流场显示实验结果一致,并验证了半经验模型中微缝剪切层的“盖子”假设.结果还表明共振器声阻主要由声压级和切向流速度决定,声抗由背腔深度和面板厚度及末端修正决定.
- 微缝共振器 /
- 声衬 /
- 切向流 /
- 涡声相互作用 /
- 离散涡方法
Abstract: To investigate the acoustic properties of a slit resonator attached to a pipe with flow,a theoretical model based on the discrete vortex method was set up.The discontinuity conditions at the joint between the pipe and the resonator were formulated using the mass and momentum conservations,then combined with a discrete vortex model the acoustic impedance and the absorption coefficient of the resonator were computed.The numerical simulation indicates that the flow field around the slit is dominated by the rolling-up and flapping motion of the shed vortex sheet,which agrees with the previous flow visualization results and validates the "lip" assumption of the shear layer at the slit in the semi-empirical models.The present results reveal that the acoustic resistance of the resonator is mainly determined by the sound pressure levels and the grazing flow speed,while the acoustic reactance is dominated by the depth of the cavity,the thickness of the plate and end correction.
- slit resonator /
- acoustic liner /
- grazing flow /
- vortex/sound interaction /

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参考文献(15)

[1]	Dupere I D J,Dowling A P.The use of Helmholtz resonators in a practical combustor[J].Journal of Engineering for Gas Turbines and Power,2005,127(2):268-275.
[2]	Smits J M A,Kosten C W.Sound absorption by slit resonators[J].Acustica,1951,1(1):114-122.
[3]	Gomperts M C.The sound insulation of circular and slit-shaped apertures[J].Acustica,1964,14(1):1-16.
[4]	马大猷.微缝吸声体理论[J].声学学报,2000,25(6):481-485. MA Dayou.Theory of microslit absorbers[J].ACTA Acustica,2000,25(6):481-485.(in Chinese)
[5]	刘克.微穿孔板和微缝板吸声体究进展[J].应用声学,2002,21(1):3-6,25. LIU Ke.Advances in the study of microperforated-panel and microslit acoustic absorbers[J].Applied Acoustics,2002,21(1):3-6,25.(in Chinese)
[6]	Jing X,Sun X.Effect of grazing flow on the acoustic impedance of an orifice[J].AIAA Journal,2001,38(9):1478-1484.
[7]	Dowling A P,Hughes I J.Sound absorption by a screen with a regular array of slits[J].Journal of Sound and Vibration,1992,156(3):387-405.
[8]	Howe M S.The influence of vortex shedding on the diffraction of sound by a perforated screen[J].Journal of Fluid Mechanics,1980,97(1):641-653.
[9]	Tam C K,Ju H,Walker B E.Numerical simulation of a slit resonator in a grazing flow under acoustic excitation[J].Journal of Sound and Vibration,2008,313(3-5):449-471.
[10]	郭庆,刘克,李嵩,等.具有流动和侧向Helnholtz共振器的驻波管内声场研究Ⅰ :理论分析[J].声学学报,2003,28(5):409-405. GUO Qing,LIU Ke,LI Song,et al.A study of sound field in a standing wave tube with flow and lateral Helmholtz resonatorⅠ :theoretical analysis[J].ACTA Acustica,2003,28(5):409-405.(in Chinese)
[11]	Brown C E,Michael W H.Effect of leading edge separation on the lift of a delta wing[J].Journal of the Acoustical Society of America,1954,21(5):690-706.
[12]	Rott N.Diffraction of a weak shock with vortex generation[J].Journal of Fluid Mechanics,1956,1(1):111-128.
[13]	Hersh A S,Walker B.Effect of grazing flow on the acoustic impedance of Helmholtz resonators consisting of single and clustered orifices .NASA CR-3177,1979.
[14]	Baumeister K J,Rice E J.Visual study of the effect of grazing flow on the oscillatory flow in a resonator orifice .NASA TM X-3288,1975.
[15]	Guess A W.Calculation of perforated plate liner parameters from specified acoustic resistance and reactance[J].Journal of Sound and Vibration,1975,40(1):119-137.