多模式太阳能热推进的性能计算和分析

Performance Calculation and Analysis of Multi-STP

在分析直接式、间歇式和补燃式三种工作模式太阳能热推进(STP)的技术特点的基础上,基于太阳能高温对流换热和工质换热的光热学理论,建立三种工作模式STP的物理数学模型,分别计算其推进性能,并分析了聚光器参数,推进剂种类,工质对流换热性能等因素对三种工作模式STP推进性能的影响。计算结果表明,当有效聚光半径为4m,以氢气为工质时,直接式STP比冲800s左右,推力约10N;氢气过量系数在2～5之间时,补燃式STP推进性能较好。

Solar thermal propulsion （STP） is a novel space propulsion system.The characteristics of direct STP,indirect STP and post-combustion STP are presented.Their propulsive performances are calculated by employing high temperature solar thermal convection theory respectively.Effects of solar concentrator radius and propellant kinds are discussed.The calculation results demonstrate that taking hydrogen as propellant.The direct STP with 4 m mirror radius provides thrust of 10 N at specific impulse of 800 s.The propulsive performance of post-combustion STP within the hydrogen excess coefficient ranges of 2-5 is appropriate.