Abstract
Cavitation is well known as evil phenomenon which causes severe erosion in hydraulic machinery such as pumps, valves and propellers because of impacts produced at cavitation bubbles collapse. However, a cavitating jet which is a submerged high-speed water jet with cavitation is used for surface modification such as introduction of compressive residual stress and improvement of fatigue strength in the same way of shot peening. In order to enhance ability of cavitating jet which depend on nozzle throat diameter and injection pressure, an erosion test for aluminum and a measurement of compressive residual sterss of duralumin induced by cavitation peening were carried out.
