Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Simulation of SI-HCCI Transition in a Two-Stroke Free Piston Engine Fuelled with Hydrogen

수소 2행정 프리피스톤엔진의 SI-HCCI 변화에 관한 수치해석적 연구

  • Hung, Nguyen Ba (Grad. School of Mechanical and Automotive Engineering, University of Ulsan) ;
  • Park, Kyuel (Department of Mechanical and Automotive Engineering, University of Ulsan) ;
  • Lim, Ocktaeck (Department of Mechanical and Automotive Engineering, University of Ulsan)
  • 왼바흥 (울산대학교 기계자동차공학과 대학원) ;
  • 박규열 (울산대학교 기계자동차공학부) ;
  • 임옥택 (울산대학교 기계자동차공학부)
  • Received : 2013.10.23
  • Accepted : 2013.12.31
  • Published : 2013.12.31
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Abstract

A free piston linear engine could be operated under HCCI combustion due to its variable compression ratios. To obtain HCCI combustion, the free piston linear engine needs a high compression ratio to achieve auto-ignition of the fuel/air mixture. In this study, an idea for obtaining a high compression ratio using the transition from SI combustion to HCCI combustion was proposed. The fuel used in this study is hydrogen, which is considered to be an environmentally friendly fuel. Besides, the effects of key parameters such as equivalence ratio (${\phi}$), load resistance ($R_L$) and intake temperature ($T_{in}$) on the SI-HCCI transition were numerically investigated. The simulation results show that the SI-HCCI transition is successful without any significant reduction of in-cylinder pressure as the intake temperature is increased from $T_{in}$=300K (SI mode) to $T_{in}$=450K (HCCI mode), while the load resistance and equivalence ratio are retained respectively at $R_L=120{\Omega}$ and ${\phi}$=0.6 in both SI mode and HCCI mode.

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References

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