Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Combustion Characteristics of Landfill Gas in Constant Volume Combustion Chamber for Large Displacement Volume Engine (IV) -Torch Ignition (2) -

대형기관 모사 정적연소실에서 매립지 가스의 연소특성에 대한 연구 (IV) -토치 점화 (2)-

  • Ko, Ansu (Graduate School of NID Fusion Technology, Seoul Nat'l Univ. of Science and Technology) ;
  • Ohm, Inyong (Dept. of Mechanical and Automotive Engineering, Seoul Nat'l Univ. of Science and Technology) ;
  • Kwon, Soon Tae (Graduate school of Energy & Environment, Seoul Nat'l Univ. of Science and Technology)
  • 고안수 (서울과학기술대학교 NID융합기술대학원) ;
  • 엄인용 (서울과학기술대학교 기계.자동차공학과) ;
  • 권순태 (서울과학기술대학교 에너지환경전문대학원)
  • Received : 2014.05.08
  • Accepted : 2014.11.14
  • Published : 2015.02.01
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Abstract

This paper is the fourth on the combustion characteristics of the landfill gas in a constant volume combustion chamber for a large displacement volume commercial engine and the second dealing with torch ignition. It discusses the combustion characteristics of torch ignition on the basis of the heat release and visualization. The results show that the jet and/or spout from the torch promote combustion by accelerating the flame front in the main combustion chamber. In addition, a hot gas jet exists when the orifice diameter is 4 mm, whereas the flame passes directly through the orifice if the diameter is 6 mm or greater. In addition, the effect of torch ignition differs according to the combination of the methane fraction, torch volume, and orifice size because various combustion processes occur as a result of the interaction of these parameters. Finally, it was found that the most suitable torch should have an orifice diameter of not less than 6 mm and an area ratio of not more than 0.15 to secure a consistent combustion process in a real engine.

본 논문은 대형 상용기관을 모사한 정적연소실에서 매립지 가스의 연소 특성에 대한 복수의 논문 중 네 번째로, 열 발생 특성과 가시화 결과를 관찰하여 토치 연소의 특징을 논의하였다. 분석 결과 토치 연소는 주 연소실에 형성된 화염 면을 토치에서 분출되는 가스가 가속시킴으로 연소를 촉진한다. 이때 오리피스 직경이 4mm일 때는 토치에서 고온의 가스가 분출되며, 6mm 이상에서는 토치에서 형성된 화염이 직접 오리피스를 통과한다. 또한 메탄 분율, 토치 체적 그리고 오리피스 크기가 상호 연관적으로 작용하여 다양한 연소 형태를 야기하고 이에 따라 토치 연소의 효과가 매우 다르게 나타난다. 마지막으로 실물기관에서 연소 과정의 일관성을 보장하는 적절한 토치의 조건은 6mm 이상의 오리피스 직경과 0.15 이하의 오리피스 면적비를 동시에 만족시키는 것이다.

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References

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