Abstract: Based on Zwart-Gerber-Belamri cavitation model, a numerical calculation method of cavitating flow of water-exit missile with complex configuration was proposed. The influence of velocity of water-exit and angle of attack to cavitation of parts of missile was analyzed. The simulation results showed that in the beginning of water-exit course, body-attached bubble quickly grew due to reduction of cavitation number. After that, the effect of bubble break-off and oscillation became more obvious. In water-exit course of zero angle of attack, the length and thickness of bubble of shoulder increased linearly with velocity. The ability of the protrusion to induce the cavitation of nearby missile body was enhanced with the increase of velocity. The influence of the cavitation of the rudder by velocity was not significant. On the other hand, the influence of angle of attack on the asymmetry of the bubble of shoulder and the cavitation of the rudder was small when attack angle is less than 5°. The asymmetry of the bubble of shoulder was notable when attack angle increased to 10°. As well as the cavitation area of rudder was increasing rapidly. The influence of the angle of attack on the cavitation of the protrusion was not significant when attack angle was less than 20°.

Key words: submarine-launched missile, cavitation flow, water-exit course, bubble dynamics