Calculation of transient space heat fluxes for space cameras working in sun-synchronous circle orbit
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摘要:为了使空间相机热设计、热分析、热试验具备准确、可靠的热边界条件,对太阳同步圆轨道空间相机的瞬态外热流进行了计算。总结了卫星空间定位的6个轨道根数之间的关系,给出了太阳同步圆轨道空间定位的必要参数。针对某给定太阳同步圆轨道,采用STK软件进行了轨道面与太阳光矢量相对位置关系(角)的计算,确定了该轨道的高、低温工况位置。归纳了空间外热流的理论计算方法,以外接于卫星平台的空间相机为例,建立了外热流计算模型,采用IDEAS/TMG模块对给定太阳同步圆轨道的高、低温工况轨道周期内瞬态外热流变化进行了分析计算,得出了太阳辐射热流、地球太阳反照热流、地球红外辐射热流在轨道周期内的详细变化曲线,得到的结果可以作为空间相机热设计、热分析及地面热试验外热流模拟的输入条件。Abstract:In order to obtain accurate, reliable thermal boundary conditions for the thermal design, thermal analysis and thermal tests of space cameras, the transient space heat fluxes of space cameras working in sun-synchronous circle orbits are calculated. The relations of six orbit elements in space orientation of satellites are summarized, and the necessary parameters for the sun-synchronous circle orbit are given. The relative positions between sun vector and orbit, angles are calculated with STK program for the given sun-synchronous circle orbit, thus the upper temperature orbit and lower temperature orbit are oriented. Based on the theory calculation of space heat fluxes and taking some space cameras working in the given orbit as examples, a Finite Element(FE) calculation model for the space fluxes is constructed. Using IDEAS/TMG module, the transient space heat fluxes of upper temperature orbit and lower temperature orbit are calculated particularly. The transient change curves of solar radiation heat fluxes, earth and solar reflection heat fluxes and the earth and infrared radiation heat fluxes in an orbit period are obtained. The calculation results could be taken as input data of space cameras for thermal analysis and the simulation of space heat fluxes in space environment thermal tests.
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