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Acoustic Spectra from Turbulent Jets

 

作者: William C. Meecham,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1971)
卷期: Volume 49, issue 1B  

页码: 334-338

 

ISSN:0001-4966

 

年代: 1971

 

DOI:10.1121/1.1912334

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

One of the interesting and important problems involving turbulent jets is that of determining the spectrum of the radiated sound. This has proved to be a difficult theoretical problem because the space‐time correlation of the velocity is central in the prediction of such sound characteristics. In this work, the following assumptions are used in the development. First, it is supposed, as is often the case in turbulence measurements, that the turbulent fluid has approximately Gaussian statistical characteristics. Then, it is supposed that the space‐time characteristics for the needed second‐order velocity correlation can be obtained by assuming that the fluid is approximately in “frozen flow.” From these assumptions, the higher‐frequency sound‐power spectrum is obtained in terms of an integral over the turbulence energy spectrum. For the familiar energy spectrumk−5/3, it is found that the sound spectrum behaves like ω−4/3. This is flatter than most measurements. A measured frequency spectrum of ω−3would be obtained from an energy spectrumk−5/2.

 

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