宇航级自由活塞斯特林发电机回热器优化设计

Optimal design of regenerator of an aerospace grade free piston Stirling engine

为提升一台宇航级自由活塞斯特林发电机(FPSG)回热器性能,提出了一种基于响应面法的回热器优化方法。基于Sage平台构建了FPSG仿真模型,研究了回热器长度、孔隙率、丝径对FPSG输出PV功与热功转换效率的影响,得到了回热器的优化参数。结果显示:FPSG输出PV功随回热器长度、孔隙率、丝径的增大而减小;热功转换效率随回热器长度的增大而缓慢增大,随孔隙率的增大而先增大后减小,随丝径的增大而减小;优化后回热器长度为40 mm,孔隙率为85%,丝径为30μm;经实验验证,FPSG输出PV功提升16.9%,热功转换效率提升12.9%。

In order to improve the performance of the regenerator of an aerospace grade free piston Stirling generator(FPSG),an optimal design method of the regenerator based on the re-sponse surface method was proposed.A simulation model of FPSG was constructed based on the Sage platform.The effects of the length,porosity and wire diameter of the regenerator on the out-put PV work and the heat and power conversion efficiency of the FPSG system were studied.Then,the optimal parameters of the regenerator were obtained.The results show that the output PV power of FPSG decreases with the increase in length,porosity and wire diameter of the regen-erator.The thermal power conversion efficiency increases gradually with the increase of the length,first increases and then decreases with the increase of porosity,and decreases with the in-crease of wire diameter.After optimization,the length of the regenerator is 40 mm,the porosity is 85%,and the wire diameter is 30μm.Verified by experiments,the output PV power of FPSG has increased by 16.9%and the thermal power conversion efficiency has increased by 12.9%.