水下发射气幕提前喷射时间对载荷影响仿真研究

建立结构网格和流场网格耦合的航行体出筒过程气幕降载计算模型。通过有/无气幕工况的计算对比，发现气幕提前喷射时机对降载效果影响较大。通过对气幕提前航行体发射0.25 s、0.5 s和0.72 s工况的计算，发现航行体横向载荷随着提前喷射时间延长，呈现先降低后升高的变化规律，选择最佳喷射时机可提高降载效果。该规律可用于指导气幕降载工程设计。

The numerical simulation of gas screen jet time ahead of underwater-launch which affect vehicle loads

The gas screen jet in the underwater-launch was simulated , using a 3D symmetric model based on the coup-ling of Lagrange structure mesh and Euler fluid mesh. It was found the jet time ahead of underwater-launch is important to the vehicle horizontal loads, through the simulations with/or without the gas screen. Ahead time of 0.25 s、0.5 s and 0.72 s for gas screen jet were simulated, and vehicle horizontal loads change tendency with growing after reducing was found. It shows that the vehicle loads can be reduced by choosing the proper time. The result can be used in the design of gas screen.