回转体边界层的高频声辐射

详细信息

On the high frequency acoustic radiation from boundary layer of an axisymmetric body

1. College Of Marine Engineering, Northwestern Polytechnical University Xi'an 710072;
2. College of Navy Aeronautics Engineeriny Qingdao 266001

摘要: 已就回转体边界层声辐射的机理作了分析,并对回转体边界层的辐射声压谱进行了估算。结果表明,回转体边界层声辐射由转捩区和湍流边界层的声辐射组成;在低频段,转换区的声辐射将占主导地位,而在高频段,则湍流边界层的声辐射起主要作用。采用本文的方法所得的理论值与实测值之间的一致性较好。

Abstract: The mechanism of acoustic radiation from transition and turbulent boundary layer of an axisymmetricbody is analyzed,and the sound pressure spectrum of boundary layer radiation is predicted.It is shown that theacoustic radiation result from the transition and turbulent boundary layer,and the acoustic radiation from transitionis predominant at low frequency domain;turbulellt boundary layer has the decisive effect on acoustic radiation at highfrequency domain.The calculated values are in agreement with the experimeotal data very well.