气动光学头罩热辐射效应数值仿真研究  

Numerical simulation of thermal radiation effect about optical dome in aerodynamic thermal environment

作　　者：范志刚[1] 于翠萍[1] 肖昊苏[1] 张旺[1] 

机构地区：[1]哈尔滨工业大学空间光学工程研究中心,黑龙江哈尔滨150001

出　　处：《应用光学》2012年第4期649-653,共5页Journal of Applied Optics

基　　金：航空科学基金(20080177003)

摘　　要：气动热环境下高速飞行器的光学头罩由于受气动热效应作用,其温度急剧升高,产生严重的气动热辐射效应。为评估气动热环境下高速飞行器光学头罩热辐射对探测系统性能的影响,采用有限光线代表连续辐射的方法,并引入热瞳概念建立了气动光学头罩热辐射传输计算模型并对气动光学头罩自身干扰辐射光线在光学系统内的传输进行了数值仿真,考察了光学头罩温度场为非均匀分布时其自身干扰辐射在探测器接收面的辐照度分布。研究结果表明:由头罩顶点求得的热瞳是光学头罩热辐射能的公共入口,它可将光线追迹的时间减小至追迹全部光线所需时间的十几分之一;根据探测器接受面干扰辐射随时间的变化趋势可知在飞行数秒后头罩干扰辐射将淹没目标信号,气动光学头罩热辐射效应不容忽视。The temperature of the high speed aircraft optical dome rapidly rises due to aerody- namic heating, and causes severe thermal radiation effect to detection system in the aerodynam- ic thermal environment. To assess the performance degradation as a result of aerodynamic heating of the dome flying at high speed, the thermal radiation transfer of the optical dome was modeled by introducing the concept of heat pupil. The thermal radiation transmission of the dome through the optical system was simulated numerically, and the irradiance distribution of the dome on the detector＇s receiving surface was obtained according to the nonhomogeneous temperature distribution. The research results show that the concept of heat pupil suits for the dome and reduces the time in ray tracing enormously, and according to the trend of the dome＇s radiation receiving by detector following time, we can see after a few seconds in flight the in- terference radiation from dome would flood the target signal. Therefore, the thermal radiation of the dome in aerodynamic thermal environment cannot be neglected.

关 键 词：气动光学 光学头罩 热辐射效应 光线追迹法 

分 类 号：TN206[电子电信—物理电子学] O435.1[机械工程—光学工程]