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http://dx.doi.org/10.15231/jksc.2014.19.4.028

Effects of Lewis Number and Preferential Diffusion in Syngas Flame Diluted with He and Ar  

Kim, Tae Hyung (Power Generation Research Laboratory, Korea Electric Power Research Institute)
Park, Jeong (Department of Mechanical Engineering, Pukyong National University)
Kwon, Oh Boong (Department of Mechanical Engineering, Pukyong National University)
Park, Jong Ho (Department of Mechanical Engineering, Chungnam Natioanl University)
Publication Information
Journal of the Korean Society of Combustion / v.19, no.4, 2014 , pp. 28-34 More about this Journal
Abstract
Numerical study is conducted to grasp flame characteristics in $H_2/CO$ syngas counterflow diffusion flames diluted with He and Ar. An effective fuel Lewis number, applicable to premixed burning regime and even to moderately-stretched diffusion flames, is suggested through the comparison among fuel Lewis number, effective Lewis number, and effective fuel Lewis number. Flame characteristics with and without the suppression of the diffusivities of H, $H_2$, and He are compared in order to clarify the important role of preferential diffusion effects through them. It is found that the scarcity of H and He in reaction zone increases flame temperature whereas that of $H_2$ deteriorates flame temperature. Impact of preferential diffusion of H, $H_2$, and He in flame characteristics is also addressed to reaction pathways for the purpose of displaying chemical effects.
Keywords
Effective fuel Lewis number; $H_2/CO$ syngas; Preferential diffusion; Reaction pathway;
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