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"Buzz-saw" noise: a comparison of measurement with prediction

"Buzz-saw" noise: a comparison of measurement with prediction
"Buzz-saw" noise: a comparison of measurement with prediction
Accurate prediction of “buzz-saw” noise in a turbofan inlet duct necessitates consideration of nonlinear acoustics, modelling a complete fan blade set, modelling an acoustic liner, and calculations at high frequencies. A recent series of papers has described new work concerning the application of one-dimensional propagation models to the prediction of buzz-saw noise. A numerical model, termed the frequency domain numerical solution or FDNS, has been developed. It can be used to calculate the nonlinear propagation of the rotor-alone pressure field in either a rigid or acoustically-lined inlet duct. From this the in-duct noise level of the buzz-saw tones can be determined. In previous work, validation of this method by comparison with in-duct noise measurements has been limited to rigid inlet ducts, because of the lack of availability of suitable measurements from lined ducts. In this article new measurements of buzz-saw noise in an acoustically-lined inlet duct are utilized. A comparison of measurements of buzz-saw noise in a lined inlet duct, and noise predictions from numerical simulations by the FDNS is presented. The detailed measurements reveal the effect of an acoustic liner on buzz-saw noise. The suitability of the numerical model to be used to provide realistic noise predictions for supersonic ducted fans is also examined.
0022-460X
1202-1233
McAlpine, A.
aaf9e771-153d-4100-9e84-de4b14466ed7
Fisher, M.J.
9662c037-03c2-4a45-9b58-9b83fe5b323d
Tester, B.J.
1bd4a793-131b-4173-93cc-3eca70b2d116
McAlpine, A.
aaf9e771-153d-4100-9e84-de4b14466ed7
Fisher, M.J.
9662c037-03c2-4a45-9b58-9b83fe5b323d
Tester, B.J.
1bd4a793-131b-4173-93cc-3eca70b2d116

McAlpine, A., Fisher, M.J. and Tester, B.J. (2006) "Buzz-saw" noise: a comparison of measurement with prediction. Journal of Sound and Vibration, 290 (3-5), 1202-1233. (doi:10.1016/j.jsv.2005.05.028).

Record type: Article

Abstract

Accurate prediction of “buzz-saw” noise in a turbofan inlet duct necessitates consideration of nonlinear acoustics, modelling a complete fan blade set, modelling an acoustic liner, and calculations at high frequencies. A recent series of papers has described new work concerning the application of one-dimensional propagation models to the prediction of buzz-saw noise. A numerical model, termed the frequency domain numerical solution or FDNS, has been developed. It can be used to calculate the nonlinear propagation of the rotor-alone pressure field in either a rigid or acoustically-lined inlet duct. From this the in-duct noise level of the buzz-saw tones can be determined. In previous work, validation of this method by comparison with in-duct noise measurements has been limited to rigid inlet ducts, because of the lack of availability of suitable measurements from lined ducts. In this article new measurements of buzz-saw noise in an acoustically-lined inlet duct are utilized. A comparison of measurements of buzz-saw noise in a lined inlet duct, and noise predictions from numerical simulations by the FDNS is presented. The detailed measurements reveal the effect of an acoustic liner on buzz-saw noise. The suitability of the numerical model to be used to provide realistic noise predictions for supersonic ducted fans is also examined.

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Published date: 7 March 2006

Identifiers

Local EPrints ID: 27999
URI: https://eprints.soton.ac.uk/id/eprint/27999
ISSN: 0022-460X
PURE UUID: 1d6d3e10-bd00-4d71-8031-08ee45f4b4d9
ORCID for A. McAlpine: ORCID iD orcid.org/0000-0003-4189-2167

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Date deposited: 28 Apr 2006
Last modified: 20 Jul 2019 01:11

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