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Micro free piston swing engine (MFPSE) was designed to provide mechanical power for portable power generation systems. For the problems of heat transfer and leakage of MFPSE, the micro engine can’t continually work. In this paper, the mathematical model of MFPSE, including dynamic model, thermodynamic model, heat transfer model and leakage model, was established. Numerical simulations were executed by comparing to without leakage and heat transfer. The results manifest that: (1) work cycle of the center swing is lengthened, and compression ratio and generator capacity of MFPSE decrease; (2) the maximum pressure of combustion chamber appreciably decrease with the clearance of the body-center swing increasing; (3) when the clearance is more than 5μm, compression ratio of combustion chamber can’t meet the design requirements. It results in the MFPSE combustion that can’t work effectively. Consequently, this research provides guidance for further improving the design and promoting practical use of the MFPSE.

Impacts of Heat Transfer and Leakage on Performance of Micro Free Piston Swing Engine