Axisymmetrical Instability Wave Control due to Resonance Coupling of Azimuthal Modes in High-Speed Jet Issuing from Corrugated Nozzle

摘要

In the present work we investigate the resonance phenomenon for the instability wave interaction due to periodical azimuthal nonuniformity of the mean flow. Our goal consists in finding the parameters of nonuniformity which lead to coupling of axisymmetrical instability wave n=0 with the nonradiating one. In the previous investigation this type of resonance didn't be founded. The new analytical procedure for describing all types of resonances is proposed in the present work. In the whole, the result is obtained that the appearance of nonaxisymmetrical features in jet flow leads in the first place to effect on axisymmetrical mode. It is very important because the axisymmetrical mode put the main contribution into high-speed jet noise.