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Surface-pressure fluctuations induced by boundary-layer flow at finite Mach number

Published online by Cambridge University Press:  28 March 2006

John E. Ffowcs Williams
John E. Ffowcs Williams
Affiliation:
Department of Mathematics, Imperial College, London
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Abstract

A theory describing boundary-layer surface-pressure fluctuations on a rigid surface is presented in a form that illustrates the main effect of compressibility. The most significant effect is that the correlation area is proportional to the square of mean-flow Mach number so it does not vanish in flow of finite compressibility. Modifications of the wave-number and frequency spectra by this effect are described, and the results applied to the computation of large plate response. That computation incorporates the effect of fluid loading, which enters the response equations as a dissipative term for components at supersonic phase velocity but merely as an added loading for subsonic components.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 22 , Issue 3 , July 1965 , pp. 507 - 519
Copyright
© 1965 Cambridge University Press

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