Bubble-Collapse Pressure Distributions in Wake behind Symmetrical Wedges.

Abstract

To make clear the behavior of cavitation erosion, flow aspects and bubble-collapse pressures of Karman-vortex cavitation behind several symmetrical wedges are investigated under various flow conditions in due consideration of wall effect. The time histories and intensity distributions of the pressures are measured by means of a pressure transducer and pressure-sensitive films. The cavitation aspects are observed by high-speed photography. The occurrence of bubble-collapse pressures is synchronized to the Karman-vortex shedding frequency. The pressures are most intensive at about cavitation number σ=1.0, where is the transition region between subcavitation and supercavitation. For an increase in wedge angle or angle of attack, the intensity distributions of the pressures distinctly extend towards downstream.