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Modelling installed jet noise due to the scattering of jet instability waves by swept wings

Published online by Cambridge University Press:  14 May 2019

Benshuai Lyu Open the ORCID record for Benshuai Lyu [Opens in a new window]  and
Ann P. Dowling
Benshuai Lyu*
Affiliation:
Department of Engineering, University of Cambridge, CambridgeCB2 1PZ, UK
Ann P. Dowling
Affiliation:
Department of Engineering, University of Cambridge, CambridgeCB2 1PZ, UK
*
†Email address for correspondence: [email protected]
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Abstract

Jet noise is a significant contributor to aircraft noise, and on modern aircraft it is considerably enhanced at low frequencies by a closely installed wing. Recent research has shown that this noise increase is due to the scattering of jet instability waves by the trailing edge of the wing. Experimentalists have recently shown that noise can be reduced by using wings with swept trailing edges. To understand this mechanism, in this paper, we develop an analytical model to predict the installed jet noise due to the scattering of instability waves by a swept wing. The model is based on the Schwarzschild method and Amiet’s approach is used to obtain the far-field sound. The model can correctly predict both the reduction in installed jet noise and the change to directivity patterns observed in experiments due to the use of swept wings. The agreement between the model and experiment is very good, especially for the directivity at large azimuthal angles. It is found that the principal physical mechanism of sound reduction is due to destructive interference. It is concluded that in order to obtain an effective noise reduction, both the span and the sweep angle of the wing have to be large. Such a model can greatly aid in the design of quieter swept wings and the physical mechanism identified can provide significant insight into developing other innovative noise-reduction strategies.

JFM classification

Instability: Absolute/convective instability Acoustics: Aeroacoustics Acoustics: Jet noise
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 870 , 10 July 2019 , pp. 760 - 783
Copyright
© 2019 Cambridge University Press 

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