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http://dx.doi.org/10.15231/jksc.2016.21.1.038

A Study on Flame Structure and NO Emission in FIR- and FGR-applied Methane-air Counterflow Diffusion Flames  

Park, Jeong (Dep. of Mechanical Engineering, Pukyoung Nat'l University)
Kwon, Oh Boong (Dep. of Mechanical Engineering, Pukyoung Nat'l University)
Kim, Sewon (Thermochemical Energy System Group, Korea Institute of Industrial Technology)
Lee, Changyeop (Thermochemical Energy System Group, Korea Institute of Industrial Technology)
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)
Lim, In Gweon (Dept. of Mechanical Engineering, Myongji University)
Publication Information
Journal of the Korean Society of Combustion / v.21, no.1, 2016 , pp. 38-45 More about this Journal
Abstract
Flame characteristics and NO emission behavior in $CH_4$/air-air premixed counterflow flames with applying FIR and FGR with $CO_2$ and $H_2O$ were investigated numerically by varying the ratios of FIR and FGR as well as global strain rate. Chemical effects of added $CO_2$ and $H_2O$ via FIR and FGR were analyzed through comparing flame characteristics and NO behaviors from real species($CO_2$ and $H_2O$) with those from their artificial species($XCO_2$ and $XH_2O$) which have the same thermochemical, radiative, and transport properties to those for the real species. The results showed that flame temperature and NO emission with FIR varied much more sensitively than that with FGR. Those varied little irrespective of adding $CO_2$, $H_2O$, and their artificial species to the fuel stream via FIR. However, Those were varied complicatedly by chemical effects of added $CO_2$ and $H_2O$ via FGR. Detailed analyses for them were made and discussed.
Keywords
FIR; FGR; NO emission; Radiation heat loss; Flame extinction;
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