Behavior and Erosion of Cavitating Jet Impinging on Oblique Surface

Abstract

It is known that a cavitating jet causes a ring-shaped erosion distribution on an impingement wall. A purpose of the present study is to make clear the mechanism of high impact and erosion due to cavitation cloud. We made some observations of cavitation cloud and erosion using an oblique wall with asymmetrical state of cavitation cloud. We tried to correlate the erosion distribution with behaviors of cavitation cloud using an image analysis about an oblique impingement type of cavitating water jet. As a result, a characteristic erosion distribution and a collapsing behavior of cavitation cloud appear on the test plate. The phenomena of pressure wave propagation with cloud collapses are shown quantitatively using an image analysis in relation to the erosion distribution. It is shown that a chain reaction of cloud collapses and propagation of pressure wave play an important role in the case of oblique impingement of cavitating water jet.