Research on cavity collapse characteristics during high-speed water-exit of the supercavitating projectile

During high-speed water-exit of the supercavitating projectile, cavity interacts with free surface and collapses, instantaneous high collapse pressure impacting on projectile. In order to study characteristics during numerical based Reynolds-averaged equation volume fluid multiphase flow model is conducted in this paper. The results show that near will gradually become larger movement projectile existence attitude angles cause asymmetry collapse. upstream side first generate pressure, while downstream later but higher pressure. becomes stronger increasing angles. time interval sides shorter close tail.