Measurement of Cavitation Shock around Two-dimensional Elliptic Cylinders

Abstract

In this paper, the intensity of cavitation shock-noise is measured by using 8 models of elliptical cylinders of various eccentricites for the purpous of knowing the effect of a change of the shape of a body in a cavitating flow. In a model which has a longer axis, the maximum intensity of shock noise is lower and the cavitation number corresponding to the maximum noise is smaller. When long elliptic bodies are set inclined to the flow, the maximum noise becomes larger as the angle of inclined to the flow, the maximum noise becomes larger as the angle of incidence increases and at the same time the cavitation umber corresponding to it becomes larger. The periods of cavitation shock are also measured. The period for the semi-circular elliptical cylinders shows a tendency of being reduced as the cavitation number becomes small, but for the long elliptical cylinders having the angle of incidence, contrarily the period increases as the cavitation number becomes smaller.