To the problem of cavitation and shock that appears in the outside circulation piston pump running, the relation-ship between rotor profile and dead volume, flow rate and cavitation were analyzed.

Laser-induced plasma shock wave and cavitation bubble by pulsed laser ablation of a metal in water are investigated by a high-sensitive optical beam deflection technique.

A convex shape can weaken the shock impact and subsequent cavitation collapse. However, such effect is well limited.