基于多块嵌套结构动网格的拦截弹防热保护罩的二维分离模拟

在末制导阶段,拦截弹上的红外热保护罩要进行分离,分离引起的气动力变化将直接影响到导弹的制导精度.采用多块嵌套结构动网格技术数值模拟了拦截导弹的热保护罩的二维分离过程.给出了在整个分离过程中,两片保护罩运动的轨迹,并且给出了各个时间步对应的压力云图.预测了由于前激波而产生的作用在导弹上气动力的振荡.跟踪了在各个时刻流场对于导弹上红外窗口的影响.

Two-dimensional simulations about the separation of the interceptor missile shroud covers based on moving multi-block chimera structure grids

In the final stages of interceptor trajectories, the shroud covers shall be deployed resulting in the change of aerodynamic force which will have effect on the guidance precision of missile. Two-dimensional simulations about the separation of the interceptor missile shroud covers have been completed using moving multi-block chimera structure grid technique. Locations of the shroud covers and the pressure contour of the flow field at each time step during the separation process were described. Computational simulations predict the relevant flow features of acoustic loads resulting from separation and pressure oscillations at each trace location primarily driven by the oscillations of the bow shock. The influence of the flow field on the infrared window was also predicted in the simulations.