Resonance Behaviors of Cavity Flow around a Rectangular Cylinder

Abstract

Resonance behaviors of two-dimensional cavity flow around a rectangular cylinder, accompanied by severe vibration at some values of cavitation number, were experimentally studied by measuring the fluid dynamic forces and surface pressures, and by the flow visualization. The width-to-height ratio of the cylinder tested is 2.8, which is called the critical value. Periodic fluctuations of the surface pressure were investigated using a phase-averaging technique. Severe vibration occurs at a cavitation number, in which the fixed-type cavitation is formed in the separation bubble on the side surface and the surface pressure fluctuates during the time when a cloud of bubbles is shed from its cavity termination.