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

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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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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 Std 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.",

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N2 - 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 Std 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.

AB - 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 Std 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.

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JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

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

Abstract

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