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Aeroacoustics of supersonic jet issued from corrugated nozzle: new approach and prospects

Kopiev, Victor F.; Ostrikov, Nikolai N.; Chernyshev, Sergey A.; Elliott, John W.

Authors

Victor F. Kopiev

Nikolai N. Ostrikov

Sergey A. Chernyshev

Dr John Elliott J.W.Elliott@hull.ac.uk
Lecturer in Mathematics/ Admissions officer



Abstract

It is generally accepted that one of the main sources of acoustic radiation from a supersonic jet is due to spatial instability wave packets propagating downstream within the jet. This approach has enabled us to explain and predict the principal features of sound radiated by a supersonic jet witha circular nozzle. The aim of this present work is to generalize such an approach to jets with acircular nozzle deformed into a weakly corrugated (s-lobed) shape. This leads to the presence oftwo additional parameters, the lobe number (an integer) characterizing the corrugation wavelength and the corrugation amplitude. Their presence can be shown to lead to a resonant coupling between different instability waves which, in turn, can both intensify and suppress the aerodynamic noise.The assumption of a small corrugation amplitude allows us to consider the problem analytically using disturbance theory methods. The structure of the eigen-oscillations is determined at leading orders, where it is shown that differing azimuthal harmonics are coupled over a wide range of frequencies. The result of such couplings on the radiated sound is significant, even for a small corrugation amplitude. The above suggests that the effect of mode coupling, due to nozzle corrugation, could be used as a tool for noise control in supersonic jets.

Journal Article Type Article
Publication Date 2004-07
Print ISSN 1475-472X
Electronic ISSN 2048-4003
Publisher Multi-Science Publishing
Peer Reviewed Peer Reviewed
Volume 3
Issue 3
Pages 199-228
APA6 Citation Kopiev, V. F., Ostrikov, N. N., Chernyshev, S. A., & Elliott, J. W. (2004). Aeroacoustics of supersonic jet issued from corrugated nozzle: new approach and prospects. International journal of aeroacoustics, 3(3), 199-228. doi:10.1260/1475472042887443
DOI https://doi.org/10.1260/1475472042887443
Keywords Acoustics and Ultrasonics; Aerospace Engineering

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