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A Study on Flame Extinction in Oxymethane Combustion
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 Title & Authors
A Study on Flame Extinction in Oxymethane Combustion
Kim, Tae Hyung; Kwon, Oh Boong; Park, Jeong; Keel, Sang-In; Yun, Jin-Han; Park, Jong Ho;
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Oxy-methane nonpremixed flames diluted with were investigated to clarify impact of radiation heat loss and chemical effects of additional to oxidizer stream on flame extinction. Flame stability maps were presented with functional dependencies of critical diluents mole fraction upon global strain rate at several oxidizer stream temperatures in , , and counterflow flames. The effects of radiation heat loss on the critical diluent mole fractions for flame extinction are not significant even at low strain rate in nonpremixed diffusion flame, whereas those are significant at low strain rate and are negligible at high strain rate (> ) in and counterflow flames. Chemical effects of additional to oxidizer stream on the flame extinction curves were appreciable in both and flames. A scaling analysis based on asymptotic solution of stretched flame extinction was applied. A specific radical index, which could reflect the OH population in main reaction zone via controlling the mixture composition in the oxidizer stream, was identified to quantify the chemical kinetic contribution to flame extinction. A good correlation of predicted extinction limits to those calculated numerically were obtained via the ratio between radical indices and oxidizer Lewis numbers for the target and baseline flames. This offered an effective approach to estimate extinction strain rate of nonpremixed oxy-methane flames permitting air infiltration when the baseline flame was taken to nonpremixed flame.
Chemical effects;Radiation heat loss;Flame extinction;Radical index;
 Cited by
충격파관 저압실/고압실 직경비에 따른 압력변동에 대한 수치해석,왕위엔강;김철진;손채훈;정인석;

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