Abstract
In order to clarify the mechanism of aerodynamic noise generation, aerodynamic sound source was measured and estimated experimentally with Howe's vortex theory. To measure an instantaneous vorticity field in the wake of a circular cylinder, a dynamic PIV system was utilized. The experimental results show the sound pressure level can be estimated with measured vorticity and the vortex theory. The strong sound source can be observed at the formation region of Karman Vortex Street. The coherence between the measured and estimated sound is relatively high at the fundamental frequency. These results reveal that the dynamic PIV are useful tools of understanding for mechanism of aerodynamic noise generation.
