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 › peer-review

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

Access to Document

10.1017/S0022112085000076

Cite this

@article{4c89578bddd44008a8c01d1c35e889f9,

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

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.",

author = "Hussain, {M. F.A.K.} and Hasan, {Z. M.A.}",

year = "1985",

month = jan,

doi = "10.1017/S0022112085000076",

language = "English",

volume = "150",

pages = "159--168",

journal = "Journal of Fluid Mechanics",

issn = "0022-1120",

}

TY - JOUR

T1 - Turbulence suppression in free turbulent shear flows under controlled excitation. Part 2. Jet-noise reduction

AU - Hussain, M. F.A.K.

AU - Hasan, Z. M.A.

PY - 1985/1

Y1 - 1985/1

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.

UR - http://www.scopus.com/inward/record.url?scp=0021877922&partnerID=8YFLogxK

U2 - 10.1017/S0022112085000076

DO - 10.1017/S0022112085000076

M3 - Article

AN - SCOPUS:0021877922

VL - 150

SP - 159

EP - 168

JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

ER -

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this