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Simulation Study of SI-HCCI Transition in a Two-Stroke Free Piston Engine Fuelled with Propane
Technical Paper
2014-01-1104
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A simulation study was conducted to examine the transition from SI combustion to HCCI combustion in a two-stroke free piston engine fuelled with propane. Operation of the free piston engine was simulated based on the combination of three mathematical models including a dynamic model, a linear alternator model and a thermodynamic model. The dynamic model included an analysis of the piston motion, based on Newton's second law. The linear alternator model included an analysis of electromagnetic force, which was considered to be a resistance force for the piston motion. The thermodynamic model was used to analysis thermodynamic processes in the engine cycle, including scavenging, compression, combustion, and expansion processes. Therein, the scavenging process was assumed to be a perfect process. These mathematical models were combined and solved by a program written in Fortran. To validate the mathematical models, the simulation results were compared with experimental data in the SI mode. In addition, the effects of key parameters such as equivalence ratio, load resistance, intake temperature and intake pressure on the transition from SI combustion to HCCI combustion were investigated. The simulation results showed that the transition was successful if the equivalence ratio, load resistance, intake temperature, and intake pressure were adjusted appropriately.
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Nguyen Ba, H., Lim, O., and Iida, N., "Simulation Study of SI-HCCI Transition in a Two-Stroke Free Piston Engine Fuelled with Propane," SAE Technical Paper 2014-01-1104, 2014, https://doi.org/10.4271/2014-01-1104.Also In
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