球形头罩高超声速绕流流场光传输数值仿真

Numerical Simulation of Rays Propagating through Hypersonic Flow Field around Sphere-shaped Dome

气动光传输效应会影响导弹的制导精度,文中针对球形头罩的高速绕流流场进行了数值模拟,并对流场的光传输进行了仿真分析。首先求得绕流流场的密度分布,进而转化为非均匀变折射率场的分布;再利用光线追迹法求得光线的传输路径;最后计算得到光线通过湍流流场后的偏折量。结果表明:飞行马赫数越高,则头罩绕流流场的密度及折射率越大,光线的偏移量越大;同时,偏离头罩驻点位置越远,光线的偏移量也越大。

The guidance precision of missile can be affected by aero-optical transmission effect in flow field. In this paper, the hypersonic flow field around sphere-shaped dome was numerically simulated, and the rays propagating through the flow field was also analyzed. First- ly, density distribution of the flow field was obtained. Secondly, the distribution of inhomogeneous refractive index field was determined. Lastly, the path and deflection of the rays propagating through the hypersonic flow field were obtained by tracing rays. The results indicate that, with increasing flight March number, the density and refractive index are increased. It is also indicated that the deflection increases as the distance deviating from the stagnation point of the dome increases and the March number increases.