Analysis of ejection after-effect for underwaterlaunched emulating missile

2D axi-symmetric simulation models for underwater-launched emulating missile ejection aftereffect were built up based on mixture multi-phase model and dynamic meshing technology, which took the cavitations and vaporization effect into consideration. Through simulation, time-variable velocity characteristics of underwater missile, effect of balance gas and vaporization on ejection after-effect were achieved. Simulation results showed that effect of balance gas on after-effect was remarkable, and that of vaporization was negligible. This research method and its conclusions are a good kind of reference to analysis of pressure field near canister outlet and design of the water ballistics of underwater-launched missile.