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Improved jet noise modeling using a new time-scale

Improved jet noise modeling using a new time-scale
Improved jet noise modeling using a new time-scale
To calculate the noise emanating from a turbulent flow using an acoustic analogy knowledge concerning the unsteady characteristics of the turbulence is required. Specifically, the form of the turbulent correlation tensor together with various time and length-scales are needed. However, if a Reynolds Averaged Navier–Stores calculation is used as the starting point then one can only obtain steady characteristics of the flow and it is necessary to model the unsteady behavior in some way. While there has been considerable attention given to the correct way to model the form of the correlation tensor less attention has been given to the underlying physics that dictate the proper choice of time-scale. In this paper the authors recognize that there are several time dependent processes occurring within a turbulent flow and propose a new way of obtaining the time-scale. Isothermal single-stream flow jets with Mach numbers 0.75 and 0.90 have been chosen for the present study. The Mani–Gliebe–Balsa–Khavaran method has been used for prediction of noise at different angles, and there is good agreement between the noise predictions and observations. Furthermore, the new time-scale has an inherent frequency dependency that arises naturally from the underlying physics, thus avoiding supplementary mathematical enhancements needed in previous modeling.
0001-4966
1015-1025
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.
8b96166d-fc06-48e7-8c76-ebb3874b0ef7

Azarpeyvand, M. and Self, R.H. (2009) Improved jet noise modeling using a new time-scale. Journal of the Acoustical Society of America, 126 (3), 1015-1025. (doi:10.1121/1.3192221).

Record type: Article

Abstract

To calculate the noise emanating from a turbulent flow using an acoustic analogy knowledge concerning the unsteady characteristics of the turbulence is required. Specifically, the form of the turbulent correlation tensor together with various time and length-scales are needed. However, if a Reynolds Averaged Navier–Stores calculation is used as the starting point then one can only obtain steady characteristics of the flow and it is necessary to model the unsteady behavior in some way. While there has been considerable attention given to the correct way to model the form of the correlation tensor less attention has been given to the underlying physics that dictate the proper choice of time-scale. In this paper the authors recognize that there are several time dependent processes occurring within a turbulent flow and propose a new way of obtaining the time-scale. Isothermal single-stream flow jets with Mach numbers 0.75 and 0.90 have been chosen for the present study. The Mani–Gliebe–Balsa–Khavaran method has been used for prediction of noise at different angles, and there is good agreement between the noise predictions and observations. Furthermore, the new time-scale has an inherent frequency dependency that arises naturally from the underlying physics, thus avoiding supplementary mathematical enhancements needed in previous modeling.

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More information

Published date: September 2009
Organisations: Fluid Dynamics & Acoustics Group

Identifiers

Local EPrints ID: 71542
URI: https://eprints.soton.ac.uk/id/eprint/71542
ISSN: 0001-4966
PURE UUID: 022db9c2-ce4a-4c5b-aa8c-c4a1d9d49839

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Date deposited: 10 Mar 2010
Last modified: 19 Jul 2019 23:45

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