Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Numerical Analysis for Booster Effect in DME HCCI Engine with Fuel Stratification

연료의 불균질성을 갖는 DME HCCI엔진에서 과급의 효과에 관한 수치해석

  • Kwon, O-Seok (Graduate School of Mechanical and Automotive Engineering, Ulsan University) ;
  • Lim, Ock-Taeck (Department of Mechanical and Automotive Engineering, Ulsan University)
  • 권오석 (울산대학교 기계자동차공학과) ;
  • 임옥택 (울산대학교 기계자동차공학부)
  • Received : 2009.03.23
  • Accepted : 2009.11.12
  • Published : 2010.05.01
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Abstract

The purpose of this study is to gain a better understanding of the effects of fuel stratification on reducing the pressure-rise rate at high load in HCCI combustion. It was found that fuel stratification offers good potential to achieve a staged combustion event and reduced pressure-rise rates. The engine is fueled with Di-Methyl Ether (DME) which has unique 2-stage heat release. Numerical analysis is conducted with single and multi-zones model and detailed chemical reaction scheme is done by chemkin and senkin. Calculation result shows that proper fuel stratification prolongs combustion duration and reduce pressure rise rate. Besides IMEP, combustion efficiency and indicated thermal efficiency keep constant. However, too wide fuel stratification increases pressure rise rate and CO and NOx emissions in exhaust gas.

Keywords

References

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