Performance Investigation of Single–Piston Free Piston Expander–Linear Generator with Multi–Parameter Based on Simulation Model

Zhuxian Liu, Zhong Wu (), Yonghong Xu (), Hongguang Zhang, Jian Zhang and Fubin Yang
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Zhuxian Liu: Faculty of Environment and Life, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
Zhong Wu: Faculty of Environment and Life, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
Yonghong Xu: Faculty of Environment and Life, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
Hongguang Zhang: Faculty of Environment and Life, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
Jian Zhang: Mechanical Engineering, University of Wisconsin-Green Bay, 2420 Nicolet Dr., Green Bay, WI 54311, USA
Fubin Yang: Faculty of Environment and Life, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China

Energies, 2022, vol. 15, issue 23, 1-28

Abstract: The structural design and operating strategy of a free piston expander–linear generator (FPE–LG) has a major impact on performance. In this paper, the simulation model of single–piston FPE–LG was built and verified by combining the structural parameters of the existing test rig with a set of kinetic and thermodynamic equations. On this basis, the influence of the design and operating parameters of the device on the performance was studied, while keeping other parameters fixed. Then, a sensitivity analysis of power output and operating frequency was carried out. The results show that within a certain range of external load and intake beginning position, increasing the diameter of the intake and exhaust pipes, or reducing the piston rod diameter can improve the power output. Within a certain range of frictional coefficient and intake time, increasing the cylinder diameter and intake pressure, or reducing the piston assembly mass and back electromotive force (EMF) constant can increase the operating frequency. Both the power output and the operating frequency are most sensitive to the cylinder diameter among the design parameters. Among the operating parameters, power output is the most sensitive to intake pressure, and operating frequency is the most sensitive to intake beginning position. The optimization of structural design and operation strategy in expander provides important guiding significance for ORC waste heat recovery system.

Keywords: single–piston free piston expander–linear generator; design and operating parameter; waste heat recovery; sensitivity analysis; simulation model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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