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Coupled dynamic-multidimensional modelling of free-piston engine combustion

Lookup NU author(s): Dr Rikard Mikalsen, Professor Tony Roskilly



Free-piston engines are under investigation by a number of research groups worldwide, as an alternative to conventional technology in applications such as electric and hydraulic power generation. The piston dynamics of the free-piston engine differ significantly from those of conventional engines, and this may influence in-cylinder gas motion, combustion and emissions formation. Due to the complex interaction between mechanics and thermodynamics, the modelling of free-piston engines is not straight-forward. This paper presents a novel approach to the modelling of free-piston engines through the introduction of solution-dependent mesh motion in an engine CFD code. The particular features of free-piston engines are discussed, and the model for engine dynamics implemented in the CFD code is described. Finally, the coupled solver is demonstrated through the modelling of a spark ignited free-piston engine generator.

Publication metadata

Author(s): Mikalsen R, Roskilly AP

Publication type: Article

Publication status: Published

Journal: Applied Energy

Year: 2009

Volume: 86

Issue: 1

Pages: 89-95

ISSN (print): 0306-2619

ISSN (electronic): 1872-9118

Publisher: Pergamon


DOI: 10.1016/j.apenergy.2008.04.012


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