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

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

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.

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. https://doi.org/10.1260/1475472042887443

• Journal Article Type: Article
• Acceptance Date: Jan 1, 2004
• Online Publication Date: Nov 30, 2016
• Publication Date: 2004-07
• Print ISSN: 1475-472X
• Publisher: Multi-Science Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 3
• Issue: 3
• Pages: 199-228
• DOI: https://doi.org/10.1260/1475472042887443
• Keywords: Acoustics and Ultrasonics; Aerospace Engineering
• Public URL: https://hull-repository.worktribe.com/output/405411