Energy and exergy analysis of hydraulic free-piston engines

A hydraulic free-piston engine is an unconventional reciprocating piston internal combustion engine in which the piston assembly motion is determined by in-cylinder gas pressure and load force. Fuel combustion energy is directly converted into hydraulic energy. These affect the work process of cylin...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering Part D: Journal of Automobile Engineering, 2019-10, Vol.233 (12), p.3074-3087
Main Authors: Wang, Lei, Zhao, Zhenfeng, Yu, Chuncun, Zhang, Fujun, Zhao, Changlu
Format: Article
Language:English
Subjects:
Cylinders
Diesel engines
Efficiency
Energy
Energy conservation law
Energy conversion efficiency
Energy distribution
Energy utilization
Exergy
Free-piston engines
Fuel combustion
Gas pressure
Hydraulics
Internal combustion engines
Parameters
Piston engines
Thermodynamic efficiency
Waste heat recovery
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Summary:A hydraulic free-piston engine is an unconventional reciprocating piston internal combustion engine in which the piston assembly motion is determined by in-cylinder gas pressure and load force. Fuel combustion energy is directly converted into hydraulic energy. These affect the work process of cylinder and efficiency of energy conversion. In order to study the energy utilization efficiency and to explore the recovery potential of waste heat energy of hydraulic free-piston engine, in this paper, the energy distribution and waste heat energy characteristics of hydraulic free-piston engine have been studied by combining energy and exergy analysis. The thermal efficiency was analyzed by the first law of thermodynamics, and exergy balance was analyzed by the second law. The effect of the characteristic parameters on the thermal and exergy efficiency was studied through the simulation analysis comparing the energy utilization of hydraulic free-piston engine and conventional engines. The results show that control of the injection timing parameter is effective for optimizing efficiency because the cycle characteristic parameters can be controlled by changing the injection timing. The experimental results show that the thermal efficiency is 40.8% and the exergy efficiency is 46.3%. The simulation result show that the thermal efficiency of hydraulic free-piston engine is 38.0% and the conventional diesel engine is 33.0%.
ISSN:0954-4070
2041-2991
DOI:10.1177/0954407018816543