太阳能热推进系统流场和性能计算

利用FLUENT计算流体软件,建立太阳能热推进系统内部工质流体(氢气)流动模型,根据太阳能热推进系统地面试验的运行情况和结构参数,对氢气在热推进系统内部的流动、传热现象进行了数值仿真研究,对系统内部流场结构和传热机理进行探讨;同时,研究了喷管收敛半角、扩张半角及喉管直径对太阳能推进系统性能的影响。研究结果表明,太阳能推进器的结构参数对系统性能影响较大,收敛半角对太阳能热推进系统的比冲影响不明显,对质量流量和推力的影响较明显;在其他参数一定的情况下,存在一组最佳结构参数:扩张半角oθpt=60°,喉管直径Dopt=2 mm,对应于最佳比冲Isp=803 s。

Flow Field and Performance Calculation of Solar Thermal Propulsion System

The commercial CFD software named FLUENT was used to simulate the fluid （H2） flow process in solar thermal propulsion system. According to the ground test operating conditions and parameters of the solar thermal propulsion system, the system properties such as hydrogen flow,heat transfer in the solar thermal propulsion system were studied. The flow field structure of the system and mechanism of heat transfer were explored. At the same time,the performance of the system was investigated by changing the convergent half angle, the divergent half angle and the throat diameter. The numerical results clearly indicate that the geometric parameters of the thruster have great influence on performance of the system. When other parameters have no change, the convergent half angle has great influence on the flux and the thrust of system but not on the specific impulse,and there are an optimum divergent half angle,that is θopt =60° and an optimum throat diameter, that is Dopt = 2 mm, corresponding to the highest specific imputse Isp = 803 s.