A weak-scattering model for turbine-tone haystacking outside the cone of silence
A weak-scattering model for turbine-tone haystacking outside the cone of silence
We consider the scattering of sound by turbulence in a jet shear layer. The turbulent, time-varying inhomogeneities in the flow scatter tonal sound fields in such a way as to give spectral broadening, which decreases the level of the incident tone, but increases the broadband level around the frequency of the tone. The scattering process is modelled for observers outside the cone of silence of the jet, using high-frequency asymptotic methods and a weak-scattering assumption. An analytical model for the far-field power spectral density of the scattered field is derived, and the result is compared to experimental data. The model correctly predicts the behaviour of the scattered field as a function of jet velocity and tone frequency
17-50
Powles, C.J.
7566be27-f1fe-4ea0-aca3-3aef19cb72de
Tester, B.J.
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McAlpine, A.
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February 2011
Powles, C.J.
7566be27-f1fe-4ea0-aca3-3aef19cb72de
Tester, B.J.
1bd4a793-131b-4173-93cc-3eca70b2d116
McAlpine, A.
aaf9e771-153d-4100-9e84-de4b14466ed7
Powles, C.J., Tester, B.J. and McAlpine, A.
(2011)
A weak-scattering model for turbine-tone haystacking outside the cone of silence.
International Journal of Aeroacoustics, 10 (1), .
(doi:10.1260/1475-472X.10.1.17).
Abstract
We consider the scattering of sound by turbulence in a jet shear layer. The turbulent, time-varying inhomogeneities in the flow scatter tonal sound fields in such a way as to give spectral broadening, which decreases the level of the incident tone, but increases the broadband level around the frequency of the tone. The scattering process is modelled for observers outside the cone of silence of the jet, using high-frequency asymptotic methods and a weak-scattering assumption. An analytical model for the far-field power spectral density of the scattered field is derived, and the result is compared to experimental data. The model correctly predicts the behaviour of the scattered field as a function of jet velocity and tone frequency
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Published date: February 2011
Organisations:
Fluid Dynamics & Acoustics Group
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Local EPrints ID: 172729
URI: http://eprints.soton.ac.uk/id/eprint/172729
ISSN: 1475-472X
PURE UUID: dc146165-fd77-4df8-933c-84f64b836079
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Date deposited: 28 Jan 2011 12:07
Last modified: 14 Mar 2024 02:42
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Author:
C.J. Powles
Author:
B.J. Tester
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