Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Effects of Port Masking on Emission

포트 마스킹이 엔진의 배기에 미치는 영향

  • Kim, Hyeong-Sig (Graduate School of Energy & Environment, Seoul National University of Science and Technology) ;
  • Park, Chan-Jun (Department of Mechanical Engineering, Seoul National University of Science and Technology) ;
  • Ohm, In-Yong (Department of Mechanical Engineering, Seoul National University of Science and Technology)
  • 김형식 (서울과학기술대학교 에너지환경대학원) ;
  • 박찬준 (서울과학기술대학교 기계공학과) ;
  • 엄인용 (서울과학기술대학교 기계공학과)
  • Received : 2010.03.09
  • Accepted : 2010.10.17
  • Published : 2011.05.01
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Abstract

To secure basic data for intake port design, effects of a port masking on the part load performance were investigated in a 4 valve SI engine. For this purpose, 9 kinds of masking, which have different shapes and masking ratio, are applied to the engine intake system. The characteristics of the performance were estimated through mixture response test at various engine load and speed. The results show that NOx emission, one of indexes for stratification, increases considerably in spite of retarded spark timing due to the stratification which is caused by unequal flow distribution between the two intake ports. The mechanism of stratification by masking is different from axial stratification and the fuel entering through masked port plays a very important role in this stratification process. In conclusion, the port masking method could be easily applied to engine intake system and be very effective for inducing the stratified charging without the change of port design.

Keywords

References

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