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http://dx.doi.org/10.15231/jksc.2015.20.4.034

A Study on Flame Extinction in Oxymethane Combustion  

Kim, Tae Hyung (Power Generation Research Laboratory, Korea Electric Power Research Institute)
Kwon, Oh Boong (Dept. of Mechanical Engineering, Pukyoung National University)
Park, Jeong (Dept. of Mechanical Engineering, Pukyoung National University)
Keel, Sang-In (Environment & Energy Research Division, Korea Institute of Machinery and Materials)
Yun, Jin-Han (Environment & Energy Research Division, Korea Institute of Machinery and Materials)
Park, Jong Ho (Dept. of Mechanical Engineering, Chungnam National University)
Publication Information
Journal of the Korean Society of Combustion / v.20, no.4, 2015 , pp. 34-41 More about this Journal
Abstract
Oxy-methane nonpremixed flames diluted with $CO_2$ were investigated to clarify impact of radiation heat loss and chemical effects of additional $CO_2$ 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 $CH_4-O_2/N_2$, $CH_4-O_2/CO_2$, and $CH_4-O_2/CO_2/N_2$ 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 $CH_4-O_2/N_2$ diffusion flame, whereas those are significant at low strain rate and are negligible at high strain rate (> $200s^{-1}$) in $CH_4-O_2/CO_2$ and $CH_4-O_2/CO_2/N_2$ counterflow flames. Chemical effects of additional $CO_2$ to oxidizer stream on the flame extinction curves were appreciable in both $CH_4-O_2/CO_2$ and $CH_4-O_2/CO_2/N_2$ 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 $CH_4-O_2/N_2$ flame.
Keywords
Chemical effects; Radiation heat loss; Flame extinction; Radical index;
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