Optimal design of regenerator of an aerospace grade free piston Stirling engine
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 30 μm.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％.
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