The silent base flow and the sound sources in a laminar jet
The silent base flow and the sound sources in a laminar jet
An algorithm to compute the silent base flow sources of sound in a jet is introduced. The algorithm is based on spatiotemporal filtering of the flow field and is applicable to multifrequency sources. It is applied to an axisymmetric laminar jet and the resulting sources are validated successfully. The sources are compared to those obtained from two classical acoustic analogies, based on quiescent and time-averaged base flows. The comparison demonstrates how the silent base flow sources shed light on the sound generation process. It is shown that the dominant source mechanism in the axisymmetric laminar jet is “shear-noise,” which is a linear mechanism. The algorithm presented here could be applied to fully turbulent flows to understand the aerodynamic noise-generation mechanism.
1959-1968
Sinayoko, Samuel
0e4346ca-1a26-481d-8241-f83730f6b0e4
Agarwal, Anurag
f63a9325-bd24-4341-8727-42a87cc5a163
2012
Sinayoko, Samuel
0e4346ca-1a26-481d-8241-f83730f6b0e4
Agarwal, Anurag
f63a9325-bd24-4341-8727-42a87cc5a163
Sinayoko, Samuel and Agarwal, Anurag
(2012)
The silent base flow and the sound sources in a laminar jet.
Journal of the Acoustical Society of America, 131, .
(doi:10.1121/1.3672804).
(PMID:22423693)
Abstract
An algorithm to compute the silent base flow sources of sound in a jet is introduced. The algorithm is based on spatiotemporal filtering of the flow field and is applicable to multifrequency sources. It is applied to an axisymmetric laminar jet and the resulting sources are validated successfully. The sources are compared to those obtained from two classical acoustic analogies, based on quiescent and time-averaged base flows. The comparison demonstrates how the silent base flow sources shed light on the sound generation process. It is shown that the dominant source mechanism in the axisymmetric laminar jet is “shear-noise,” which is a linear mechanism. The algorithm presented here could be applied to fully turbulent flows to understand the aerodynamic noise-generation mechanism.
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Sinayoko_Agarwal_JASA_2012.pdf
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e-pub ahead of print date: 15 March 2012
Published date: 2012
Organisations:
Acoustics Group
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Local EPrints ID: 359087
URI: http://eprints.soton.ac.uk/id/eprint/359087
ISSN: 0001-4966
PURE UUID: 1ac52718-f86f-4977-aad4-08b5e837d901
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Date deposited: 22 Oct 2013 09:00
Last modified: 14 Mar 2024 15:16
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Author:
Samuel Sinayoko
Author:
Anurag Agarwal
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