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http://dx.doi.org/10.15231/jksc.2016.21.4.048

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

Sim, Keunseon (Department of Aerospace Engineering, Sunchon National University)
Lee, Keeman (School of Mechanical and Aerospace Engineering, Sunchon National University)
Publication Information
Journal of the Korean Society of Combustion / v.21, no.4, 2016 , pp. 48-60 More about this Journal
Abstract
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.
Keywords
Conductive heat loss; Counterflow configuration; Downstream interaction; Flame extinction; Global strain rate; SNG (Synthetic Natural Gas);
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Times Cited By KSCI : 1  (Citation Analysis)
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