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Development and validation of a free-piston engine generator numerical model

Lookup NU author(s): Dr Boru Jia, Dr Guohong Tian, Professor Tony Roskilly


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This paper focuses on the numerical modelling of a spark ignited free-piston engine generator and the model validation with test results. Detailed sub-models for both starting process and steady operation were derived. The compression and expansion processes were not regarded as ideal gas isentropic processes; both heat transfer and air leakage were taken into consideration. The simulation results show good agreement with the prototype test data for both the starting process and steady operation. During the starting process, the difference of the in-cylinder gas pressure can be controlled within 1 bar for every running cycle. For the steady operation process, the difference was less than 5% and the areas enclosed on the pressure-volume diagram were similar, indicating that the power produced by the engine and the engine efficiency could be predicted by this model. Based on this model, the starting process with different starting motor forces and the combustion process with various throttle openings were simulated. The engine performance during stable operation at 100% engine load was predicted, and the efficiency of the prototype was estimated to be 31.5% at power output of 4 kW. (C) 2014 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Jia BR, Zuo ZX, Tian GH, Feng HH, Roskilly AP

Publication type: Article

Publication status: Published

Journal: Energy Conversion and Management

Year: 2015

Volume: 91

Pages: 333-341

Print publication date: 01/02/2015

Online publication date: 26/12/2014

Acceptance date: 28/11/2014

ISSN (print): 0196-8904

ISSN (electronic): 1879-2227

Publisher: Pergamon


DOI: 10.1016/j.enconman.2014.11.054


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Funder referenceFunder name
51006010National Nature Science Foundation of China
B12022Programme of Introducing Talents of Discipline to Universities of China