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On turbulence and noise of an axisymmetric shear flow

Published online by Cambridge University Press:  29 March 2006

A. Michalke  and
H. V. Fuchs
A. Michalke
Affiliation:
Institut für Thermo- und Fluiddynamik, Technische Universität, Berlin
H. V. Fuchs
Affiliation:
DFVLR-Institut für Turbulenzforschung, Berlin
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Abstract

The noise produced by mean flow-turbulence interaction of a circular subsonic jet is investigated theoretically, and expanded in azimuthal constituents of the turbulent pressure fluctuations. It is found that the low-order azimuthal constituents are the most efficient sound sources. On the basis of pressure correlation measurements, the azimuthal constituents are determined in a low Mach number jet. It is found that, in a range of Strouhal numbers between 0·2 and 1, the first three to four azimuthal constituents clearly dominate over the rest of the turbulent source quantity. A strictly axisymmetric ring vortex model for the coherent structure of the turbulence is, however, shown to be inappropriate.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 70 , Issue 1 , 15 July 1975 , pp. 179 - 205
Copyright
© 1975 Cambridge University Press

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