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REVIEW ARTICLES: Compressible Free Mixing and Jet Noise Reduction

Physics and Prediction of Supersonic Jet Noise

[+] Author and Article Information
Christopher K. W. Tam

Department of Mathematics, Florida State University, Tallahassee FL 32306-3027

Appl. Mech. Rev 47(6S), S184-S187 (Jun 01, 1994) doi:10.1115/1.3124402 History: Online April 29, 2009

Abstract

Both the large turbulence structures and the fine scale turbulence of the flows of supersonic jets are sources of turbulent mixing noise. At moderately high supersonic Mach numbers especially for hot jets, the dominant part of the noise is generated directly by the large turbulence structures. The large turbulence structures propagate downstream at supersonic velocities relative to the ambient sound speed. They generate strong Mach wave radiation analogous to a supersonically travelling wavy wall. A stochastic instability wave model theory of the large turbulence structures and noise of supersonic jets has recently been developed. The theory can predict both the spectrum and directivity of the dominant part of supersonic jet noise up to a multiplicative empirical constant. Calculated results agree well with measurements.

Copyright © 1994 by American Society of Mechanical Engineers
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