热推力器层板换热芯流固耦合传热与流动仿真

Fluid-solid coupled heat transfer and flow simulation of platelet heat exchanger in thermal thruster

热推进技术采用小分子量气体作为推进剂可以获取较高的比冲,是具有巨大应用前景的空间推进技术,而提高热推力器换热芯换热效率是目前亟待解决的问题。本文设计了基于层板结构的换热芯,结合层板结构的传热特点与流固耦合传热理论,对层板换热芯传热和工质流动进行了模拟计算。根据耦合传热理论,将层板与工质的导热简化为系统内部边界条件,通过仿真计算得到了层板流固耦合温度场和流场分布特性,工质可以被加热至2300K以上,验证了层板结构用于热推力器换热芯的有效性。

Thermal propulsion system includes solar thermal propulsion and nuclear thermal propulsion, and it is a significant issue to improve the heat transfer efficiency of the thermal thruster. Based on the fluid-solid coupled heat transfer, this study utilized the platelet heat transfer characteristics to simulate the heat transfer and flow field of the platelet passage. A coupled system included both the coupled flow and the heat transfer between fluid and solid parts, in addition to the coupled heat transfer among solid parts. Simulation result shows that the fluid - solid coupled method can solve the steady heat transfer in the platelet structure, and the propellant can be heated to the design temperature of 2300K for the thermal propulsion system.