Abstract
In order to clarify the effect of turbulence on aerodynamic noise generation, aerodynamic sound and noise source distribution were measured. In the case of weak turbulence, the sound source was clearly observed at the formation region of Karman vortex. Except the fundamental frequency of Karmna vortex, sound source distribution depends on the scattering effect of the cylinder surface. On the other hand, the strength of sound source became large in the formation domain of Karman vortex. In the strong turbulence field, the sound source was disappeared. The result showed that the level of sound source around a circular cylinder strongly depended on a velocity fluctuation of mean flow direction.
