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概要

Cavitation normally causes severe damage in hydraulic machinery such as pumps and valves. However, cavitation impact can be used for surface enhancement as same way as shot peening. The peening method using cavitation impacts are called “cavitation shotless peening (CSP)” as shots are not required . The great advantage of CSP is that the peened surface is smoother than shot peened one. This is one of reasons why impovement of fatigue strength of metallic materials peened by CSP is better than that of shot peening. In case of CSP, the cavitation bubbles were normally produced by injecting a h igh-speed water jet into a water filled chamber. This type of jet with cavitation named as a cavitating jet in water. Recently, a cavitating jet in air without a water filled chamber was successfully realized by injecting a high-speed water jet into a low-speed water jet, which is injecting into a ir, using a concentric nozzle. The ability of a cavitating jet in air is larger than that of a cavitating jet in water and a normal water jet in air. The ability of a cavitating jet in water with associated jet at optimum condition is also greater than that of a cavitating jet in water without jet.

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