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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Study of Numerical Analysis on Mixed Combustion Characteristics in a Gasoline Direct Injection Engine with Premixed Hydrogen

수소 예혼합 가솔린 직접분사 엔진의 혼소특성에 관한 수치해석 연구

  • Bae, Jaeok (Department of Mechanical Engineering, Pusan National University) ;
  • Choi, Minsu (Department of Mechanical Engineering, Pusan National University) ;
  • Suh, Hyunuk (Department of Mechanical Engineering, Pusan National University) ;
  • Jeon, Chunghwan (School of Mechanical Engineering, Pusan National University)
  • 배재옥 (부산대학교 기계공학부 대학원) ;
  • 최민수 (부산대학교 기계공학부 대학원) ;
  • 서현욱 (부산대학교 기계공학부 대학원) ;
  • 전충환 (부산대학교 기계공학부)
  • Received : 2013.11.01
  • Accepted : 2013.12.31
  • Published : 2013.12.31
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Abstract

Gasoline direct injection(GDI) engine has a high thermal efficiency, but it has a problem to increase carbon emissions such as soot and $CO_x$. In this study, the objective is to analyze numerically a problem for adding the hydrogen during the intake stroke so as to reduce the injected amount of gasoline in GDI engines. For selection of the base model, the cylinder pressure of simulation is matched to experimental data. The numerical analysis are carried out by a CFD model with the hydrogen addition of 2%, 3% and 4% on the volume basis. In the case of 3% hydrogen addition, the injected gasoline amount is only changed to match the maximum pressure of simulation to that of the base model for additional study. It is found that the combustion temperature and pressure increase with the hydrogen addition. And NO emission also increases because of the higher combustion temperature. $CO_x$ emissions, however, are reduced due to the decrease of injected gasoline amount. Also, as the injected gasoline amount is reduced for the same hydrogen addition ratio, the gross indicated work is no significant, But NO and $CO_x$ emissions are considerably decreased. On the order hand, $CO_x$ emissions of two cases are more decreased and their gross indicated works are higher obtained than those of the base model.

Keywords

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