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On the tones and pressure oscillations induced by flow over rectangular cavities

Published online by Cambridge University Press:  19 April 2006

Christopher K. W. Tam  and
Patricia J. W. Block
Christopher K. W. Tam
Affiliation:
Department of Mathematics, Florida State University, Tallahassee
Patricia J. W. Block
Affiliation:
NASA Langley Research Center, Hampton, Virginia 23665
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Abstract

Experimental measurements of the frequencies of discrete tones induced by flow over rectangular cavities were carried out over a range of low subsonic Mach numbers to provide a reliable data base for (aircraft wheel well) cavity noise consideration. A mathematical model of the cavity tones and pressure oscillation phenomenon based on the coupling between shear layer instabilities and acoustic feedback is developed to help in understanding the tone generation mechanism. Good agreement is found between discrete tone frequencies predicted by the model and experimental measurements over a wide range of Mach numbers. Evidence of tones generated by the cavity normal mode resonance mechanism at very low subsonic Mach numbers is also presented.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 89 , Issue 2 , 28 November 1978 , pp. 373 - 399
Copyright
© 1978 Cambridge University Press

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