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

M. F.A.K. Hussain; Z. M.A. Hasan

doi:10.1017/S0022112085000076

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

M. F.A.K. Hussain, Z. M.A. Hasan

Mechanical Engineering

Research output: Contribution to journal › Article

37 Scopus citations

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 < St₀ < 0.02, where St_d 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.

Original language	English
Pages (from-to)	159-168
Number of pages	10
Journal	Journal of Fluid Mechanics
Volume	150
DOIs	https://doi.org/10.1017/S0022112085000076
State	Published - Jan 1985

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Hussain, M. F. A. K., & Hasan, Z. M. A. (1985). Turbulence suppression in free turbulent shear flows under controlled excitation. Part 2. Jet-noise reduction. Journal of Fluid Mechanics, 150, 159-168. https://doi.org/10.1017/S0022112085000076

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