论文部分内容阅读
高层防空拦截弹热保护罩的分离对红外窗口产生了巨大影响,该文采用可压雷诺平均Navier-Stokes方程、多块嵌套结构动网格技术和有限体积法模拟了热保护罩分离。采用FDS-ROE格式对Navier-Stokes方程进行离散,并通过LUSGS方法构造了二阶隐式的双时间推进格式。从而给出了分离过程中,由于激波干扰引起的红外窗口附近流场的变化,并对比了红外窗口处不同位置的压强振荡情况,跟踪了在各个时刻流场对于导弹上红外窗口的影响,预测了保护罩分离运动的轨迹,给出了各时间步对应等压线云图。
The separation of the thermal shields of high-level air defense interceptor shells has a great impact on the infrared window. This paper simulates the thermal shield separation using the reluctant Reynolds-averaged Navier-Stokes equations, multiple nested structure moving grids and the finite volume method. The Navier-Stokes equations are discretized using the FDS-ROE scheme and a second-order implicit two-time propulsion scheme is constructed by the LUSGS method. The variation of the flow field near the infrared window caused by the shock wave during the separation process is analyzed and the pressure oscillations at different positions of the infrared window are compared. The influence of the flow field on the infrared window at each moment is tracked. The trajectory of the protective cover is predicted, and the isobologram corresponding to each time step is given.