Abstract
It is well known that the regular vortex shedding process named Karman vortex streets always occurs in the wake behind bluff bodies under high Reynolds number. The wake flow with cavitation has the same process and the Strouhal number depends on the cavitation number. But, the interference mechanism between the vortex shedding process and cavitation scale has not been clarified. This study investigated the flow visualization about wake vortex cavitation behind a wedge at several cavitation numbers by using PIV and LDV systems. The vortex shedding process had two modes corresponding to the cavitation number. To examine this mechanism, the flow visualization was executed by using the method which lays the vector map on top of the image map.
