The Simulation of Hydraulic Free Piston Engine Fueled with DME in HCCI Mode

Xiao Long Li; Yang Wang; Tao Xu; Fei Yu Song; Ya Jun He; Bin Hong

doi:10.4028/www.scientific.net/AMR.602-604.1090

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The Simulation of Hydraulic Free Piston Engine Fueled with DME in HCCI Mode

Abstract:

In order to investigate the performance of hydraulic free piston engine (HFPE) fueled with dimethyl-ether (DME) under homogeneous charge compression ignition (HCCI) combustion, one-dimensional and three-dimensional simulation models are established by AMESIM and FIRE respectively. The simulation results show that the piston’s velocity and the displacement are dissymmetric about top dead center (TDC). The residence time of piston around TDC is quite short. DME chemical reaction kinetic mechanism is applied to three-dimensional computational fluid dynamics (CFD) model. Under equivalence ratio of 0.4, boost ratio of 1.33 and EGR ratio of 0.4, three heat release peaks appears. Oxidation of CO which contributes 38% of total energy is considered as the main reason of the third heat release peak.