类THAAD导引头气动光学效应计算研究

Research on Aero-Optical Effect Calculation of THAAD-like Seeker

针对类美国末段高空域防御(Terminal High Altitude Area Defense,THAAD)系统的红外导引头外形,开展了气动光学效应计算分析,并将其用于飞行器设计。利用国家数值风洞工程高速流场计算软件NNW-HyFLOW,考虑热化学非平衡效应和材料传热耦合效应,对导引头典型状态的流场进行了模拟,获得了流场的密度、温度、压力等参数和窗口的温度场参数。基于流场参数,利用HyFLOW气动光学传输效应计算功能,开展了红外光学传输成像计算;利用HyFLOW气动光学辐射效应计算模块,开展了流场和光学窗口的热辐射计算。计算结果表明,类THAAD导引头在30 km以上飞行时,流场和光学窗口基本不会影响目标信号的光学传输成像,但流场和窗口的热辐射效应会对导引头识别目标造成影响。不过随着飞行高度的升高,这种影响会减小。

The aerodynamic optical effect is calculated and analyzed for the shape of THAAD-like infrared seeker,and it is used in aircraft design.Considering the thermochemical non-equilibrium effect and the coupling effect of material heat transfer,high-speed flow calculation software NNW-HyFLOW is used to simulate the flow field in typical state of the seeker.The flow field parameters such as density,temperature and pressure and the temperature field parameters of the window are obtained.Based on the flow field parameters,the infrared optical transmission imaging calculation is carried out by using the aero-optical transmission effect calculation function in HyFLOW.The thermal radiation calculation of flow field and optical window is carried out by using the aero-optical radiation effect calculation module.The calculation results show that when the THAAD-like seeker flies above 30 km,the flow field and optical window will not affect the optical transmission imaging of the target signal,but the thermal radiation effect of the flow field and window will affect the target recognition of the seeker.However,when the infrared seeker flies at a high altitude,the influence diminishes.