蓄热式太阳能热光伏-热推进双模系统换热特性数值模拟研究

本文通过三维数值模拟研究蓄热式太阳能热光伏-热推进双模系统的蓄/释热特性和推进性能。在蓄热式太阳能热推进系统工程模型的基础上，通过射线光学的光路分析验证了聚光器设计的合理性，并获得吸热腔壁面能量分布情况，进一步研究了相变蓄热过程的影响因素。基于场协同原理对热光伏再生冷却结构进行了优化设计，使热光伏具有较好的散热特性，提高发电功率；通过整机流动换热仿真，分析了工质流体在推进器内部的换热情况，计算结果表明，蓄热式热推进器具有达到734s比冲和0.9N推力的推进性能，以及能够满足日蚀区微小卫星的供电和推力需求。

Numerical Simulation of Heat Transfer Characteristics of Regenerative Solar Thermophotovoltaic-Propulsion Bi-Modal System

The heat storage and heat release characteristics and propulsion performance of solar thermophotovoltaic-propulsion bi-modal system is investigated by numerical calculation. Based on the engineering design mathematic model of solar thermophotovoltaic-propulsion bi-modal system, the rationality of the concentrator design is verified by the ray optics, the energy distribution on the wall of the Receiver-Absorber-Converter (RAC) cavity is obtained, and the factors affecting the process of phase change heat storage are further studied. Based on the field synergy principle, the thermophotovoltaic regenerative cooling structure is optimized to make the thermophotovoltaic have better heat transfer characteristics and increase the power generation. Through the flow simulation of solar thermal propulsion system, the heat transfer characteristics of the working fluid in the thruster is analyzed. Finally, the calculated results indicate that the regenerative solar thermal thruster can obtain 734s specific impulse and 0.9N thrust, and can meet the power supply and thrust demand of micro-satellites in the eclipse area.