Abstract
In the present study, a wake-flow field behind a circular cylinder was examined as a representative example of bluff bodies which have a fundamental pattern of separated vortex flow. Cavitation impulses were measured by an accelerometer installed on the outside wall of the test section as well as an impulsive-force sensor flush-mounted on the inside wall. Appearances of cavitation bubbles were observed by a high-speed video camera. Especially, bubble-collapsing behavior near the wall was observed in detail from various view-angles. According to the result, Karman-vortex-like cavities shed downstream are divided into some parts. Then the cavity positioning near the wall collapses rapidly with various kinds of motion patterns.
