太阳能热推力器二次聚光器再生冷却过程

为克服太阳能热推力器折射式二次聚光器容易破裂的缺点,本文采用再生冷却技术,对二次聚光器与推力室进行了一体化设计,并对该过程进行了流动与传热仿真。仿真结果表明,该设计可有效地降低聚光器的工作温度至1600K以下,热应力分析表明可有效降低其破裂的可能性。同时该设计可预热推进剂至500K以上,提高了系统的能量利用效率。通过进一步对吸收腔内的热辐射分析发现,工质流动对吸收腔壁温影响较小,吸收腔壁面仍然可以维持2400-2600K的高温。

Thermal analysis of refractive secondary concentrator of solar thermal thruster based on regenerative cooling

Solar thermal propulsion is a high efficiency propulsion system, utilizing concentrated sunlight radiation to heat low molecular weight working fluid and providing high specific impulse. With regenerative cooling, an integration of the second concentrator and thruster can cool down the former to 1600K and preheat the propellant to 600K, improving the energy conversion efficiency of the propulsion system. The thermal radiation simulation shows that the flowing propellant is of little influence to the cavity temperature and the cavity can maintain high temperature between 2400K and 2600K.