水下垂直发射燃气后效对筒盖系统的影响研究

在蒸汽-燃气弹射式水下垂直发射过程中，当弹尾离开发射筒时，燃气在筒内余压作用下瞬间溢出，与海水掺混，形成的筒口燃气泡。燃气泡周期性的膨胀-收缩引起筒盖的运动，会给筒盖系统的安全性带来隐患。基于计算流体动力学CFD软件中的Fluent软件包，采用动网格技术和Mixture模型对导弹离筒过程燃气后效及其对具有柔性支撑筒盖系统的影响进行了数值模拟。研究了筒口气泡膨胀-收缩的周期性过程，获得了出筒过程中，筒盖的运动规律和受载特性。仿真结果表明，筒盖特征测点压力值与试验测量结果吻合度较高，验证了该研究方法的有效性，为筒盖系统的设计和安全性评估提供了研究方法。

Research on the Gas Aftereffect and Its Influence on Launch Tube Cover During Underwater Vertical Launching

When a submarine launched missile is ejected from the launch tube with a gas-steam ejection system,the gas in the launch tube is overflowing under the action of residual pressure in launch tube,and then interacts with seawater to generate the bubbles at the outlet of launch tube.The periodic fluctuation of gas bubble enables the cover to move,which causes the safety issue of the launch tube cover system.Base on CFD software Fluent,dynamic mesh method and Mixture model are used to simulate the evolution process of gas bubble and its effect on the launch tube cover system with flexible-support.The movement law and load characteristics of the launch tube cover are obtained by studying the periodic expansion and contraction process of the bubble at the outlet of launch tube.The simulated result shows that the simulated data agrees with the experimental data,which verifies the validity of the proposed method.