@article { , title = {Aeroacoustics of supersonic jet issued from corrugated nozzle: new approach and prospects}, 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.}, doi = {10.1260/1475472042887443}, eissn = {2048-4003}, issn = {1475-472X}, issue = {3}, note = {Batch 005. Output ID 36959.}, pages = {199-228}, publicationstatus = {Published}, publisher = {Multi-Science Publishing}, url = {https://hull-repository.worktribe.com/output/405411}, volume = {3}, keyword = {Specialist Research - Other, Acoustics and Ultrasonics, Aerospace Engineering}, year = {2004}, author = {Kopiev, Victor F. and Ostrikov, Nikolai N. and Chernyshev, Sergey A. and Elliott, John W.} }