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Analysis of the Scavenging Process of a Two-Stroke Free-Piston Engine Based on the Selection of Scavenging Ports or Valves

Lookup NU author(s): Dr Boru Jia, Dr Yadong Wang, Dr Andrew Smallbone, Professor Tony Roskilly



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


The free-piston engine generator (FPEG) is a linear energy conversion device with the objective of utilisation within a hybrid-electric automotive vehicle power system. In this research, the piston dynamic characteristics of an FPEG is compared with that of a conventional engine (CE) of the same size, and the difference in the valve timing is compared for both port scavenging type and valve scavenging type, with the exhaust valve closing timing is selected as the parameter. A zero-dimensional simulation model is developed in Ricardo WAVE software (2016.1), with the piston dynamics obtained from the simulation model in Matlab/SIMULINK (R2017a). For the CE and FEPG using scavenging ports, in order to improve its power output to the same level as that of a CE, the inlet gas pressure is suggested to be improved to above 1.2 bar, approximately 0.2 bar higher than that used for a CE. If a CE cylinder with exhaust valves is adopted or referred to during the development of an FPEG prototype, the exhaust valve is suggested to be closed earlier to improve its power output, and a higher intake pressure is also suggested if its output power is expected to be the same or higher than that of a CE.

Publication metadata

Author(s): Jia B, Wang Y, Smallbone AJ, Roskilly AP

Publication type: Article

Publication status: Published

Journal: Energies

Year: 2018

Volume: 11

Issue: 2

Online publication date: 02/02/2018

Acceptance date: 24/01/2018

Date deposited: 02/02/2018

ISSN (print): 1996-1073

ISSN (electronic): 1996-1073

Publisher: MDPI


DOI: 10.3390/en11020324

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