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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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An Investigation of Effects of Fuel Stratification and Cooled EGR on DME HCCI Engine's Operating Ranges by Numerical Analysis

농도성층화와 Cooled EGR이 DME HCCI 엔진의 운전영역에 미치는 영향에 관한 수치해석

  • Jeong, Dong-Won (School of Mechanical & Automotive Engineering, Ulsan Univ.) ;
  • Amarbayar, D. (Institute of e-Vehicle Technology, Ulsan Univ.) ;
  • Lim, Ock-Taeck (School of Mechanical & Automotive Engineering, Ulsan Univ.)
  • 정동원 (울산대학교 기계자동차공학부) ;
  • 아마라 (울산대학교 자동차선박기술대학원) ;
  • 임옥택 (울산대학교 기계자동차공학부)
  • Received : 2010.02.16
  • Accepted : 2010.04.20
  • Published : 2010.04.30
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Abstract

Homogeneous charge compression ignition (HCCI) engines have the potential to provide both diesel-like efficiency and very low emissions of nitrogen oxide (NOx) and particulate matter(PM). However, several technical issues still must be resolved before HCCI can see application. Among these, steep pressure-rise rate which leads to narrow operating range of HCCI engine continues to be a major issue. This work investigates the combination of two methods to mitigate the excessive pressure-rise rates at high power output, namely fuel stratification and Cooled exhaust-gas recirculation (Cooled EGR), after identifying the each effects to pressure-rise rate. When applying the fuel stratification to simulation, total fuelling width of 0.15 at BDC is set as a equivalent ratio difference based on the previous research. In order to simulate the effects of cooled EGR, $CO_2$ mole fraction in pre-mixture is changed ranging from 0 to 30%. DME which has a characteristic of two-stage ignition is used as a fuel.

Keywords

References

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