An attempt to localize the sound sources in a turbulent jet using the results of the measurements of the acoustic field and the velocity fluctuation correlations

被引：10
|
作者：
Krasheninnikov, S. Yu.
Mironov, A. K.
机构：
来源：
FLUID DYNAMICS | 2010年 / 45卷 / 03期
基金：
俄罗斯基础研究基金会;
关键词：
turbulent jets; turbulent jet noise; convective velocity of vortices; sound sources; turbulence intermittence; turbulent fluid; NOISE;
D O I：
10.1134/S0015462810030075
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
A model of noise generation in the mixing layer of a jet is proposed on the basis of the measurements of the acoustic radiation of a free jet by means of a microphone system, which makes it possible to determine the location of sources of sound at a given frequency, and hot-wire measurements of the velocity of the motion of vortices of given dimensions in the mixing layer. It is shown that the acoustic wave generation can be attributed to turbulence intermittence in the jet, that is, an unsteady motion of a region occupied by a "turbulent fluid". As a result, an unsteady motion of the air ejected by the jet produces acoustic waves.
引用
收藏
页码：402 / 414
页数：13
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