Publication:

Coupled dynamic-multidimensional modelling of free-piston engine combustion (2009)

Author(s): Mikalsen R, Roskilly AP

    Abstract: 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.

      • Date: 03-06-2008
      • Journal: Applied Energy
      • Volume: 86
      • Issue: 1
      • Pages: 89-95
      • Publisher: Pergamon
      • Publication type: Article
      • Bibliographic status: Published

      Keywords: Free-piston engine; Dynamic modelling; CFD

      Staff

      Professor Tony Roskilly
      Associate Director