GEO卫星大型固面反射器背部高频箱热环境分析  

Analysis of Thermal Environment of RF Box Mounted on Back of Large Solid Reflector for GEO Satellite

作　　者：寿秋爽[1] 赵啟伟[1] 周佐新[1] SHOU Qiushuang;ZHAO Qiwei;ZHOU Zuoxin(Beijing Key Laboratory of Space Thermal Control Technology,Beijing Institute of Spacecraft System Engineering,Beijing 100094,China)

机构地区：[1]北京空间飞行器总体设计部空间热控技术北京市重点实验室,北京100094

出　　处：《航天器工程》2020年第4期93-98,共6页Spacecraft Engineering

基　　金：国家重大航天工程。

摘　　要：地球静止轨道(GEO)卫星为了改善天线性能,将一些射频设备直接安装在天线反射器背部,为此需要在反射器背部设置一个高频箱。当反射器口径大且为固面时,高频箱所处的外部热环境非常恶劣,外热流成分复杂。文章分析了高频箱不同外热流成分的影响,包括直接入射太阳光和来自反射器背部的反射光与红外辐射,并通过仿真和理论分析研究了影响高频箱外热流的主要因素。仿真结果表明:来自反射器的红外辐射热流影响更大。为减小高频箱外热流,反射器背部多层隔热组件外表面膜的太阳吸收比应尽可能小且稳定,以减小高频箱温度波动。For some GEO(geostationary orbit) satellites, some RF(radio frequency) instruments are usually installed on the back of antenna reflector together with an RF box to improve antenna properties. This configuration increases the complexity of external heat flux and worsens the heat radiation boundary of RF box, when the solid reflector is large. The effect of different components of external heat flux in the RF box, including direct incident solar energy on RF box and the reflective solar energy and infrared radiation from the reflector are studied in this paper. The major factors are also studied both numerically and theoretically. The simulation results show that the infrared radiation from the reflector is much more effective on temperature of RF box than that of reflective solar energy. The solar absorption ratio of multilayer insulator installed on back of reflector should be as small as possible and keep stable under the effect of space radiation to decrease temperature fluctuation.

关 键 词：地球静止轨道卫星 固面反射器 高频箱 外热流 

分 类 号：V443.4[航空宇航科学与技术—飞行器设计]