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Jet noise prediction using different turbulent scales

Jet noise prediction using different turbulent scales
Jet noise prediction using different turbulent scales
The turbulent energy dissipation rate time-scale and length-scale has been routinely used for the prediction of noise from turbulent flows, particularly jet streams. However, this is not the only possible choice. In general, scales evolving in a turbulent medium are threefold. First, those associated with the mean flow; second, those attributed to the turbulence and the mean flow interactions; and third, scales related to the turbulence-turbulence interactions. In this paper, special attention will be paid to further study of the underlying physics of aerodynamic noise by examining various time-scales. To do so, three time scales, namely, dissipation, production, and strain rate time scales, are defined and used in the source modelling to emphasis the effect of the turbulence structures at different jet regions on the jet noise production mechanism. The required mean value and turbulence parameters are obtained using a modified k ? ? turbulence model, and Lighthill’s Acoustic Analogy is used for the prediction of the emanated noise.
433-440
Self, R.H.
8b96166d-fc06-48e7-8c76-ebb3874b0ef7
Azarpeyvand, M.
05191a9a-040a-45d2-a5d7-d4044b4c60ba
Self, R.H.
8b96166d-fc06-48e7-8c76-ebb3874b0ef7
Azarpeyvand, M.
05191a9a-040a-45d2-a5d7-d4044b4c60ba

Self, R.H. and Azarpeyvand, M. (2009) Jet noise prediction using different turbulent scales. Acoustical Physics, 55 (3), 433-440. (doi:10.1134/S106377100903021X).

Record type: Article

Abstract

The turbulent energy dissipation rate time-scale and length-scale has been routinely used for the prediction of noise from turbulent flows, particularly jet streams. However, this is not the only possible choice. In general, scales evolving in a turbulent medium are threefold. First, those associated with the mean flow; second, those attributed to the turbulence and the mean flow interactions; and third, scales related to the turbulence-turbulence interactions. In this paper, special attention will be paid to further study of the underlying physics of aerodynamic noise by examining various time-scales. To do so, three time scales, namely, dissipation, production, and strain rate time scales, are defined and used in the source modelling to emphasis the effect of the turbulence structures at different jet regions on the jet noise production mechanism. The required mean value and turbulence parameters are obtained using a modified k ? ? turbulence model, and Lighthill’s Acoustic Analogy is used for the prediction of the emanated noise.

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Published date: May 2009

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Local EPrints ID: 155873
URI: http://eprints.soton.ac.uk/id/eprint/155873
PURE UUID: 90946c5c-68ed-4d4e-a8e8-2c7b8002324f

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Date deposited: 28 May 2010 15:24
Last modified: 14 Mar 2024 01:41

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Contributors

Author: R.H. Self
Author: M. Azarpeyvand

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