All Title Author
Keywords Abstract

-  2016 

亚临界雷诺数圆柱绕流远场气动噪声实验研究
Far-field aeroacoustic experimental study of flow around a circular cylinder at subcritical Reynolds number

DOI: 10.13700/j.bh.1001-5965.2015.0364

Keywords: 圆柱绕流,气动噪声实验,亚临界雷诺数,声学特性,噪声产生及传播机理
flow around a circular cylinder
,aerodynamic noise experiment,subcritical Reynolds numbers,acoustic characteristics,mechanism of noise generation and radiation

Full-Text   Cite this paper   Add to My Lib

Abstract:

摘要 针对亚临界雷诺数下圆柱绕流的气动噪声问题,在北京航空航天大学D5气动声学风洞中进行了圆柱绕流远场气动噪声的实验研究。在D5气动声学风洞实验段不同来流条件下,测量消声室中距离圆柱不同位置的自由场传声器的远场声压信号,经过快速傅里叶变换(FFT)获得亚临界雷诺数下圆柱绕流气动噪声随来流速度、接收点距离的变化规律。实验结果表明:圆柱绕流的远场气动噪声在垂直气流方向最大,随着偏离垂直方向角度的增大噪声逐渐减小,属于典型的偶极子噪声源辐射特性;远场气动噪声近似与来流速度的6次方成正比,与接收点到圆柱中心距离的2次方成反比,这说明偶极子类型的噪声源是圆柱绕流的主要噪声源。
Abstract:To study the aeroacoustics of the flow around a circular cylinder at subcritical Reynolds number, the experimental investigation of far-field aerodynamic noise generated from flow past a circular cylinder was carried out in D5 aeroacoustic wind tunnel at Beihang University. Under variable flow conditions in the D5 test section, the signal of the sound pressure obtained from the free-field microphones at different positions in the anechoic chamber was measured. The dependence of far-field noise on free stream velocity and receiver position was acquired with the fast Fourier transform(FFT). With the qualitative and quantitative analysis of the aeroacoustic characteristics, the experimental results validate that the noise emitted from the circular cylinder is the largest in the direction vertical to the flow and decreases with the angle increasing, belonging to the characteristics of the sound radiated from a dipole sound source. The far-field aerodynamic noise generated from the cylinder is proportional to the sixth power of flow speed and inversely proportional to the twice power of the distance between the receiver and the center of the circular cylinder, confirming the domination of the dipolar noise source.

References

[1]  BECKER S,KALTENBACHER M,ALI I.Aeroacoustic investigation of the flow around cylinder geometries:A benchmark test case[C]//13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference).Reston:AIAA,2007:1-14.
[2]  夏雪湔,邓学蓥.工程分离流动力学[M].北京:北京航空航天大学出版社,1991:157-211. XIA X J,DENG X Y.Flow separation engineering mechanics[M].Beijing:Beihang University Press,1991:157-211(in Chinese).
[3]  邢国清.流体力学泵与风机[M].北京:中国电力出版社,2009:14-98. XING G Q.Fluid mechanics pump and fan[M].Beijing:China Electric Power Press,2009:14-98(in Chinese).
[4]  STROUHAL V.Ueber eine besondere art der tonerregung[J].Annalen Der Physik,1878,241(10):216-251.
[5]  唐科范,FRANKE J.用解NS方程和FW-H积分的混合方法计算圆柱绕流噪声[J].水动力学研究与进展,2009,24(2):190-199. TANG K F,FRANKE J.Numerical simulation of noise induced by flow around cylinder using the hybrid method with the solutions of NS equation and FW-H integration[J].Chinese Journal of Hydrodynamics,2009,24(2):190-199(in Chinese).
[6]  陈宗广,郭鹏.圆柱绕流空气动力噪声数值模拟[J].声学技术,2013,32(4):65-68. CHEN Z G,GUO P.Numerical simulation of aerodynamics noise induced by flow around a circular cylinder[J].Technical Acoustics,2013,32(4):65-68(in Chinese).
[7]  ORSELLI R M,MENEGHINI J R,SALTAR F.Two and three dimensional simulation of sound generated by flow around a circular cylinder[C]//15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference).Reston:AIAA,2009:11-13.
[8]  NORBERG C.Fluctuating lift on a circular cylinder:Review and new measurements[J].Journal of Fluids and Structures,2003,17(1):57-96.
[9]  CATALALANO P,WANG M,IACCARINO G.Numerical simulation of the flow around a circular cylinder at high Reynolds numbers[J].International Journal of Heat and Fluid Flow,2003,24(4):463-469.
[10]  GERRARD J H.Measurements of the sound from circular cylinders in an air stream[J].Proceedings of the Physical Society,1955,68:453-461.
[11]  CURLE N.The influence of solid boundaries upon aerodynamic sound[J].Proceedings of the Royal Society A,1955,231(1187):505-514.
[12]  PHILLIPS O M.The intensity of Aeolian tones[J].Journal of Fluid Mechanics,1956,1(6):607-624.
[13]  ETKIN B,KORBACHER G K,KEEFE R T.Acoustic radiation from a stationary cylinder in a fluid stream (Aeolian tones)[J].Acoustical Society of America Journal,1957,29(1):30-36.
[14]  GERRARD J H.An experimental investigation of the oscillating lift and drag of a circular cylinder shedding turbulent vortices[J].Journal of Fluid Mechanics,1961,11(2):244-256.
[15]  龙双丽,聂宏,许鑫.不同雷诺数下圆柱绕流气动噪声数值模拟[J].声学技术,2011,30(2):111-116. LONG S L,NIE H,XU X.Numerical simulation of noise induced by flow around a cylinder at different Reynolds number[J].Technical Acoustics,2011,30(2):111-116(in Chinese).
[16]  REVELL J D,PRYDZ R A,HAYS A P.Experimental study of aerodynamic noise vs drag relationships for circular cylinders[J].AIAA Journal,1978,16(9):889-897.

Full-Text

comments powered by Disqus

Contact Us

service@oalib.com

QQ:3279437679

微信:OALib Journal