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Turbulence suppression in free turbulent shear flows under controlled excitation. Part 2. Jet-noise reduction

Published online by Cambridge University Press:  20 April 2006

A. K. M. F. Hussain  and
M. A. Z. Hasan
A. K. M. F. Hussain
Affiliation:
Department of Mechanical Engineering, University of Houston, Texas
M. A. Z. Hasan
Affiliation:
Department of Mechanical Engineering, University of Houston, Texas Present address: Department of Mechanical Engineering, The Catholic University of America, Washington, D.C. 20064.
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Abstract

It is shown that reduction of broadband (even total) far-field jet noise can be achieved via controlled excitation of a jet at a frequency in the range 0.01 < Stθ < 0.02, where Stθ is the Strouhal number based on the exit momentum thickness of the shear layer. Hot-wire measurements in the noise-producing region of the jet reveal that the noise suppression is a direct consequence of turbulence suppression, produced by early saturation and breakdown of maximally growing instability modes.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 150 , January 1985 , pp. 159 - 168
Copyright
© 1985 Cambridge University Press

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