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SNG/Air 예혼합 화염들의 하류상호작용에 있어서 화염 소화 거동에 관한 연구
심근선(Keunseon Sim),이기만(Keeman Lee) 한국연소학회 2016 한국연소학회지 Vol.21 No.4
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 30 s<SUP>-1</SUP>, 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.
심근선(Keunseon Sim),이기만(Keeman Lee) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12
A combined experimental and numerical study has been conducted to investigate the downstream interaction between simulated SNG-air premixed flames in fuel composition of 91% CH₄ + 6% C₃H8 + 3% H₂. In this study, the effects of fuel molar concentration(lean-rich) and strain rate(ag) were major parameters. A main focus is to investigate flames behavior and chemical interaction at flames downstream. The numerical results were calculated by OPPDIF application. The reaction mechanism adopted was USC-Ⅱ model including C3 reaction.
심근선(Keunseon Sim),김성민(Sungmin Kim),이기만(Kiman Lee) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.5
This article describes an investigation of basic combustion characteristics of radiant burner with various firing rate and equivalence ratios in porous metal. The objective of this study is to investigate the radiation efficiency, exhaust emission and preheating effect of unburned mixture in porous surface burner. As a main experimental condition, firing rates and equivalence ratios each were adjusted from 204 to 408 ㎾/㎡ and 0.4 to 1.3. Experiment results show that the flame of Porous surface burner could be divided into three modes depending on the different flame shapes. First, it was appeared low NOx and CO emission as well as low surface temperature in blue flame mode. Second, in radiation mode, surface temperature and radiation efficiency were measured highly. Finally in pool flame mode, burner surface temperature and the preheating effect of unburned mixture were decreased again.