外露式星载光电设备在轨热分析

Thermal Analysis for Exposed Photoelectric Instrument on Satellite

采用节点网络/控制容积法结合蒙特卡罗法求解星载光电设备的瞬态温度场。建立了光电设备热传导与热辐射的耦合求解方程,将外热流和内热源等因素以源项形式纳入方程中,并引入控制函数使方程适用于设备工作与不工作两种状态。虚拟面技术解决了设备非封闭性给计算带来的困难,同时可处理设备接收外热流时存在的遮挡及多次反射问题。对光电设备中反射镜组采取不同的处理方法,发现光学表面的镜射处理与漫射处理对温度场计算结果影响很大。

Node-net/finite volume method was combined with Monte Carlo method to solve transient temperature field for photoelectric instrument on satellite. The coupled equations have included a source item consisted of external heat flux and internal heat source, as well as analyzed the conduction and radiation effect. A governing function facilitated whether the satellite operating or non-working state. Dummy surface method not only avoided the diffieuhy from computing temperature filed in opened system, but also made effort when the ray of light is barrier or multi-reflected. The numerical simulation results show that the temperature filed of component varies obviously if the optical characteristics of reflectors are changed, such as the surface of the reflector is known as direction reflection or scattered reflection.