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Flow-acoustic interaction near a flexible wall

Published online by Cambridge University Press:  20 April 2006

A. P. Dowling
A. P. Dowling
Affiliation:
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ
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Abstract

The Lighthill theory has been extended so that it may be used to determine the flow noise induced by a turbulent boundary layer over a plane homogeneous flexible surface. The influence of the surface properties and the mean flow on the sound generated is brought out explicitly through the use of a Green function. It is found that there is an analogy between the sound generated by turbulence and equivalent sources placed between a surface with the same compliance as the physical surface and a hypothetical vortex sheet positioned at the outer edge of the boundary layer. This analogy is used to determine the spectrum of the surface-pressure fluctuations under statistically stationary turbulence. The form of this wall-pressure spectrum is investigated in detail for three particular types of surface: rigid surfaces, bending plates and sound-absorbent liners.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 128 , March 1983 , pp. 181 - 198
Copyright
© 1983 Cambridge University Press

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