Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
권호 표지
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Effects of Injection Pressures on Combustion and Emissions in a Direct Injection LPG Spark Ignition Engine

적접분사식 LPG엔진에서 연료분사압력이 연소/배기특성에 미치는 영향 연구

  • 이석환 (한국기계연구원 그린동력연구실) ;
  • 조준호 (명지대학교 기계공학과 대학원) ;
  • 오승묵 (한국기계연구원 그린동력연구실)
  • Received : 2010.10.11
  • Accepted : 2011.03.23
  • Published : 2011.03.30
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Abstract

High pressure LPG fuel spray with a conventional swirl injector was visualized and the impact of the injection pressure was also investigated using a DISI (direct injection spark ignition) LPG single cylinder engine. Engine performance and emission characteristics were evaluated over three different injection pressure and engine loads at an engine speed of 1500 rpm. The fuel spray pattern appeared to notably have longer penetration length and narrower spray angle than those of gasoline due to its lower angular momentum and rapid vaporization. Fuel injection pressure did not affect combustion behaviors but for high injection pressure and low load condition ($P_{inj}$=120 bar and 2 bar IMEP), which was expected weak flow field configuration and low pressure inside the cylinder. In terms of nano particle formation the positions of peak values in particle size distributions were not also changed regardless of the injection pressure, and its number densities were dramatically reduced compared to those of gasoline.

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