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Thermophysics and Aeromechanics

2003 year, number 2

Control by onset of acoustic resonance in spatial flows with coherent structures

S.A. Kozlov and S.Bardakhanov
Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Pages: 205-214


Onset of powerful resonant acoustic oscillations caused by coincidence of eigen acoustic frequency and coher-ent structures shedding frequency (a source of excitation of oscillations) is experimentally investigated in regions near 2D and 3D spa-tial configurations of rectangular, swept, and round plates mounted in a channel in parallel to its walls. Some new phenomena were revealed, in particular, an interrelation of several systems of the coherent structures, and, respectively, simultaneous  excitation of several resonance frequencies under transient conditions, arising of 3D coherent structures,  and formation of complex standing sound waves near the bodies. The results obtained are considered as different ways to control the aeroacoustic resonance and the flow on the whole.