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Dynamics of an impinging jet. Part 2. The noise generation

Published online by Cambridge University Press:  20 April 2006

Nagy S. Nosseir  and
Chih-Ming Ho
Nagy S. Nosseir
Affiliation:
Department of Aerospace Engineering, University of Southern California, University Park, Los Angeles Present address: Department of Applied Science, New York University, 26–36 Stuyvesant St, New York NY 10003.
Chih-Ming Ho
Affiliation:
Department of Aerospace Engineering, University of Southern California, University Park, Los Angeles
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Abstract

The aerodynamic noise generated by a subsonic jet impinging on a flat plate is studied from measurements of near-field and surface-pressure fluctuations. The far-field noise measured at 90° to the jet axis is found to be generated by two different physical mechanisms. One mechanism is the impinging of the large coherent structures on the plate, and the other is associated with the initial instability of the shear layer. These two sources of noise radiate to the far field via different acoustical paths.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 116 , March 1982 , pp. 379 - 391
Copyright
© 1982 Cambridge University Press

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