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Spectral broadening of jet engine turbine tones

Spectral broadening of jet engine turbine tones
Spectral broadening of jet engine turbine tones
The process of turbulent scattering is studied for the generic experiment conducted by Candel et al.1 applying an analytic weak scattering model and CAA computations. For the analytic weak scattering model an approximate form of the Lilley equation is used. The source terms of this equation are in terms of the turbulence and the incident acoustic field. In the CAA simulations the wave equation proposed by Pierce for sound in fluids with unsteady inhomogeneous flow is integrated. The unsteady turbulent base-flow is modeled using a stochastic method to generate turbulence with locally varying turbulence features as provided by time-averaged RANS. To study the spectral broadening effect analytically and computationally, the experimental set-up of Candel is considered, which involves an omnidirectional sound source, located on the axis of a round jet. The analytical predictions show very good agreement with the general trends as measured by Candel for an observer position normal to the jet axis. The computations reveal a spectral shape, which is in good agreement with those found in the experiments.
Ewert, R.
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Kornow, O.
faeab0c7-8a46-4a5f-899a-7883906a7d1d
Powles, C.
e6cfdd17-dc60-4117-a9d8-c3c0f3870012
Tester, B.
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Delfs, J.
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Rose, M.
f48a6b35-6076-4f08-af9c-75fd0b7d4cc2
Ewert, R.
c1fb5fce-6e63-44dd-8436-028ffb2afad1
Kornow, O.
faeab0c7-8a46-4a5f-899a-7883906a7d1d
Powles, C.
e6cfdd17-dc60-4117-a9d8-c3c0f3870012
Tester, B.
1bd4a793-131b-4173-93cc-3eca70b2d116
Delfs, J.
032ed65a-f18b-4be1-bac9-0abe71faa8b3
Rose, M.
f48a6b35-6076-4f08-af9c-75fd0b7d4cc2

Ewert, R., Kornow, O., Powles, C., Tester, B., Delfs, J. and Rose, M. (2008) Spectral broadening of jet engine turbine tones. 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), Vancouver, Canada, 5-7 May 2008. 05 - 07 May 2008. 20 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

The process of turbulent scattering is studied for the generic experiment conducted by Candel et al.1 applying an analytic weak scattering model and CAA computations. For the analytic weak scattering model an approximate form of the Lilley equation is used. The source terms of this equation are in terms of the turbulence and the incident acoustic field. In the CAA simulations the wave equation proposed by Pierce for sound in fluids with unsteady inhomogeneous flow is integrated. The unsteady turbulent base-flow is modeled using a stochastic method to generate turbulence with locally varying turbulence features as provided by time-averaged RANS. To study the spectral broadening effect analytically and computationally, the experimental set-up of Candel is considered, which involves an omnidirectional sound source, located on the axis of a round jet. The analytical predictions show very good agreement with the general trends as measured by Candel for an observer position normal to the jet axis. The computations reveal a spectral shape, which is in good agreement with those found in the experiments.

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More information

Published date: 2008
Venue - Dates: 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), Vancouver, Canada, 5-7 May 2008, 2008-05-05 - 2008-05-07

Identifiers

Local EPrints ID: 57787
URI: https://eprints.soton.ac.uk/id/eprint/57787
PURE UUID: 8a5c3c7d-ae10-41a8-a8bb-8b4c1ea743b7

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Date deposited: 20 Aug 2008
Last modified: 13 Mar 2019 20:33

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Contributors

Author: R. Ewert
Author: O. Kornow
Author: C. Powles
Author: B. Tester
Author: J. Delfs
Author: M. Rose

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