潜射模拟弹筒口压力场仿真

Simulation of Pressure Field near Canister Outlet for Underwater-launched Emulated Missile

基于含相变VOF模型和动网格技术并采用三维对称模型对潜射模拟弹筒口压力场特性进行了仿真分析,获取了3种不同出口速度条件下的筒口气泡脉动规律、作用在筒盖上的压强变化特性以及筒盖上的受载力矩时程,对比分析了水的可压缩性和工质气体初温对筒盖受载以及受载脉动脉宽的影响。结果表明,仿真与测试数据吻合较好,工质气体的初始温度对筒盖受载脉宽影响较大,水的可压缩性对仿真结果也有不容忽视的影响。可为筒盖系统受载分析以及筒盖系统设计提供参考。

The fluid field near canister outlet for underwater-launched emulating missile was simulated by using a 3D symmetric model based on dynamic meshing technology and VOF with phase transfer. The characteristics of bubble pulsation near canister outlet, pressure-time curves and moment-time curve over the cover were achieved through several simulation cases; also effects of water compressibility and the initial temperature of work gas on load characteristics over cover system were analyzed and compared. The simulation results agreed with the test data very well in several key bubble pulsation characteristics. The simulations also show that the initial temperature of work gas has great effect on the load pulsation duration over the cover and water compressibility is an un-negligible factor for simulation creditability. It provides a new kind of reference standard for load analysis of the cover system and the cover system design.