共鳴を伴うキャビティ音の渦放出に関する考察

抄録

Understanding the vortex flow mechanism of cavity tones is desired to control tones in aeroacoustic field. With respect to cavity tones in deep cavity with acoustic resonances the mechanism of vortex flow has not been made clear enough. When the circulation of the flow around the upstream side edge of the cavity exceeds the predetermined value, the phenomenon that the vortex might flow out is the cause of the cavity tones. It would be the estimated mechanism that the particle velocity of the resonant sound wave influences on the increase of the circulation around the upstream edge. We have tried to simulate the practical phenomenon by simple numerical calculation with this assumption mechanism. As a result of trial and error, it became possible to explain the phenomenon of cavity tones with resonance by the assumption mechanism.