Modeling of piston trajectory-based HCCI combustion enabled by a free piston engine

Chen Zhang, Ke Li, Zongxuan Sun

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Previously, the authors have designed and implemented an active motion control "virtual crankshaft" for a free piston engine, which enables precise piston tracking of desired trajectories. With this mechanism, the volume of the combustion chamber can be regulated, and therefore the pressure, temperature and species concentrations of in-cylinder gas can be adjusted in real-time which affect the combustion process directly. This new degree of freedom enables us to conduct piston trajectory-based combustion control. In this paper, a model of the free piston engine running homogeneous charge compression ignition combustion under various piston trajectories is presented. The various piston trajectories have the ability to change the compression ratio and accommodate different piston motion patterns between the top dead center and the bottom dead center. Six reaction mechanisms are employed in the model in order to demonstrate the multi-fuel combustion ability of the free piston engine, and to describe the chemical kinetics of different fuels under various piston trajectories. Analysis of the simulation results is then presented which reveals the piston trajectory effects on the combustion in terms of in-cylinder gas temperature trace, indicated output work, heat loss and radical species accumulation process.

Original languageEnglish (US)
Pages (from-to)313-326
Number of pages14
JournalApplied Energy
Volume139
DOIs
StatePublished - Feb 1 2015

Fingerprint

Free piston engines
Pistons
engine
combustion
trajectory
Trajectories
modeling
Gas cylinders
compression
Compression ratio (machinery)
Crankshafts
gas
Motion control
Combustion chambers
Heat losses
Reaction kinetics
temperature
Ignition
kinetics
Temperature

Keywords

  • Dynamics modeling
  • Free piston engine
  • Multi-fuel HCCI combustion
  • Trajectory-based combustion control

Cite this

Modeling of piston trajectory-based HCCI combustion enabled by a free piston engine. / Zhang, Chen; Li, Ke; Sun, Zongxuan.

In: Applied Energy, Vol. 139, 01.02.2015, p. 313-326.

Research output: Contribution to journalArticle

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