GEO长寿命卫星热管在轨等温性能分析

热管是GEO长寿命卫星热控设计大量使用的重要传热元件，其在轨等温传热性能是影响卫星安全可靠工作的关键因素。针对中国在轨长期稳定运行的GEO长寿命卫星热管，基于热管在轨温度遥测数据，采用数理统计方法分析热管在轨等温性能随时间的实际变化规律，分析表明：GEO长寿命卫星热管在轨等温性能稳定性良好，等温性受热管自身温度水平影响较大，年周期内呈现季节性变化，全寿命周期内随飞行时间推移呈现性能衰减下降趋势，寿命末期等温性优于1.6℃，并从热管设计、热负荷大小与分布、使用环境等方面进行等温性改进分析及应用建议。

Isothermal performance analysis of heat pipe on GEO long life satellites

The heat pipe is an important heat transfer element in thermal control design, which is used in a large number of GEO long-life satellites. On-orbit isothermal heat transfer performance of the heat pipe is a key factor affecting the safe and reliable operation of satellites. Aiming at studying the heat pipe of GEO long life satellites that have long-term stable operation on orbit in China, the mathematical statistics method was used to analyze the law of the on orbit isothermal performance of the heat pipe with time, based on the temperature telemetry date on orbit. Results show that the heat pipe of GEO long-life satellites has good isothermal stability on orbit. The isothermal performance is greatly affected by the temperature level of the heat pipe. And it shows seasonal changes during the annual cycle and a downward trend in performance degradation over the entire life cycle with the flight time. The isothermal performance of the heat pipe at the end of its life is better than 1.6℃. In this paper, the isothermal improvement analysis and application suggestions are made from the aspects of heat pipe design, heat load size and distribution and its using environment.