J0504-4-3 Relation between a stationary vortex inside a cavity and aerodynamic noise generation

Abstract

An aeroacoustic noise generated from a rectangular cavity can be suppressed by placing a square rod at a proper location on the bottom surface of the cavity. The present paper focuses on the relation between the fluid motions inside the cavity and the generation of cavity noise. The results of flow measurement and the wavelet analysis of sound signal imply that the rod causes the formation of the feedback loop system take place intermittently and occasionally, suppressing the cavity noise.