Active Control of Flow-Induced Acoustic Resonance Through Surface Perturbation

摘要

A surface perturbation technique was applied to control the flow-induced acoustic resonance inside downstream cavities. The technique made use of piezoceramic actuators embedded on the surface of an upstream test model in a crossflow to generate a controllable motion to alter vortex formation, as well as the subsequent acoustic resonance. Experiments were conducted using various configurations. It was observed that the flow-induced acoustic resonance could be effectively reduced after applying a surface perturbation technique. This was caused not only by an impairment of the vortex-shedding strength but also by a shift in the shedding frequency resulting from the control action. The vortex-strength abatement mechanism was discussed, and the estimation of the frequency-shift phenomenon as well as its effect on the impairment of acoustic resonance was experimentally assessed.