Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Lean Operation Characteristics of a Spark Ignition Engine with Reformed Gas Addition

전기점화 엔진에서 개질가스 첨가에 의한 희박연소특성 연구

  • Oh, Seung-Mook (Engine Research Center, Korea Institute of Machinery and Materials) ;
  • Kim, Chang-Up (Engine Research Center, Korea Institute of Machinery and Materials) ;
  • Kang, Kern-Yong (Engine Research Center, Korea Institute of Machinery and Materials) ;
  • Choi, Young (Engine Research Center, Korea Institute of Machinery and Materials)
  • 오승묵 (한국기계연구원 친환경엔진연구센터) ;
  • 김창업 (한국기계연구원 친환경엔진연구센터) ;
  • 강건용 (한국기계연구원 친환경엔진연구센터) ;
  • 최영 (한국기계연구원 친환경엔진연구센터)
  • Published : 2006.05.01
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Abstract

Hydrogen can extend the lean misfire limit to a large extent when it is mixed with conventional fuels for a spark ignition engine. In this study, hydrogen-enriched gaseous fuels by reforming process were simulated according to their proportions of $H_2$, CO, $CO_2$ and $N_2$ gases. Pure hydrogen and two different hydrogen-enriched gaseous mixtures(A-, B-composition) were tested for their basic effects on the engine performances and emissions in a single cylinder research engine. A- and B-composition showed different results from 100% $H_2$ addition because air/fuel mixtures were more diluted by their additions. Even though the energy fraction of reformed gases was increased, combustion stabilities and lean misfire limits were not sensitively improved. It means that combustion augmentation by $H_2$ addition was offset by the charge dilution of $N_2$ and $CO_2$. In addition, the low flammability of CO gas deteriorated thermal efficiencies. CO emission was drastically increased with B-composition which included higher CO component. However, $NO_x$ was reduced as energy fraction($X_e$) rised except for the case of 100% $H_2$ addition at $\lambda=1.2$ and was, for A-composition, lowered to a factor of ten when compared with that of $H_2$ addition. HC emissions were largely influenced by $COV_{imep}$ due to misfire and partial burns.

Keywords

References

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