한국연소학회지 (Journal of the Korean Society of Combustion)

  • 제21권4호
  • /
  • Pages.48-60
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  • 2016
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  • 1226-0959(pISSN)
  • /
  • 2466-2089(eISSN)
한국연소학회 (The Korean Society of Combustion)
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SNG/Air 예혼합 화염들의 하류상호작용에 있어서 화염 소화 거동에 관한 연구

A Study on Flame Extinction Behavior in Downstream Interaction between SNG/Air Premixed Flames

  • 심근선 (순천대학교 대학원 우주항공공학과) ;
  • 이기만 (순천대학교 기계우주항공공학부)
  • Sim, Keunseon (Department of Aerospace Engineering, Sunchon National University) ;
  • Lee, Keeman (School of Mechanical and Aerospace Engineering, Sunchon National University)
  • 투고 : 2016.08.10
  • 심사 : 2016.12.15
  • 발행 : 2016.12.30
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초록

Experimental and numerical studies were conducted to investigate flame behaviors near flammable limits for downstream-interacting SNG-air premixed flames in a counter-flow configuration. The SNG fuel consisted of a methane, a propane, and a hydrogen with volumetric ratios of 91, 6, and 3%, respectively. The most appropriate priority for some reliable reaction mechanisms examined was given to the mechanism of UC San diego via comparison of lean extinction limits attained numerically with experimental ones. Flame stability map was presented with a functional dependencies of lower and upper methane concentrations in terms of global strain rate. The results show that, at the global strain rate of $30s^{-1}$, lean extinction boundary is slanted while rich extinction one is relatively less inclined because of the dependency of such extinction boundary shapes on deficient reactant Lewis number governed by methane mainly. Further increase of global strain rate forces both extinction boundaries to be more slanted and to be shrunk, resulting in an island of extinction boundary and subsequently one flame extinction limit. Extinction mechanisms for lean and rich, symmetric and asymmetric extinction boundary were identified and discussed via heat losses and chemical interaction.

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참고문헌

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피인용 문헌

  1. 저선회 연소기에서 합성천연가스(SNG) 연료의 수소함량에 따른 연소 특성 연구 vol.28, pp.2, 2016, https://doi.org/10.7316/khnes.2017.28.2.181