与燃气射流耦合的易裂后盖开启过程数值分析

对于采用易裂盖的箱式发射系统，后盖开启过程与燃气射流流场相互影响。为了研究易裂后盖的开启过程，使用基于光滑方法和重构方法的动网格技术，将后盖裂片运动过程与燃气射流流场耦合，对整个开盖过程进行了仿真计算。得到了起始冲击波的作用过程以及发射箱内各监测点的压强曲线，并分析了燃气射流对后盖裂片的冲击作用以及对其运动过程产生的影响。结果表明，与非耦合工况的计算结果进行对比，耦合工况的结果更接近于实验数据。随着后盖裂片转动角度的不断增大，旋转力矩逐渐减小，裂片的转动速度经历了先快速上升、后缓慢下降的过程。

Numerical Analysis of Fragile Back Cover Opening Process Coupling with Jet Flow

The motion process of fragile back cover interacts with the flow field of gas jet. The dynamic mesh technology based on smoothing method and remeshing method is used to study the opening process of back cover, The opening process is simulated by coupling the motion process of back cover with the gas jet flow field. The initial shock wave is observed, and the pressure curves of monitoring points are plotted. The effect of jet flow on the motion of cover debris is analyzed. Compared to the results of uncoupled case, the results of coupled case are closer to the experimental data. The driving moment is getting small with the increase in rotation angle of cover debris. The rotation speed rises fast at first and then goes down slowly.