封闭式发射管内燃气流场数值模拟

Numerical simulation of exhausted flow field in closed launch tube

针对密封盖未及时开启造成发射装置损坏的问题进行了数值模拟。数值模拟采用多组分含有限速率非平衡化学反应流动模型 ,利用有限体积TVD数值格式求解方程组的对流项 ,对于化学反应造成的源项则采用四阶龙格库塔求解。研究表明密封盖不及时开启会在弹管间隙中形成破坏性的流动结构 ,在弹管间隙内存在着包含起始冲击波的激波振荡 。

Numerical simulation was conducted to study launching equipment damage caused by open-delay of air-proof cover. The flow model of multiple constituents finite rate unsteady state chemical reaction was used in numerical simulation, and finite volume TVD scheme used in solving convection term of the equation group. The source term generated by chemical reaction was solved by four-order Runge-Kutta algorithm. Study result shows shock oscillation with initial shock wave would be caused by open delay of the cover, and this harmful flow structure would lead to serious damage to launch equipment.