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http://dx.doi.org/10.15231/jksc.2015.20.1.006

Effects of H2O Addition in Downstream Interaction between H2-Air and CO-Air Premixed Flames  

Park, Jeong (Department of Mechanical Engineering, Pukyong National University)
Kwon, Oh Boong (Department of Mechanical Engineering, Pukyong National University)
Kim, Tae Hyung (Power Generation Research Laboratory, Korea Electric Power Research Institute)
Park, Jong Ho (Department of Mechanical Engineering, Chungnam Natioanl University)
Publication Information
Journal of the Korean Society of Combustion / v.20, no.1, 2015 , pp. 6-14 More about this Journal
Abstract
Numerical study was conducted to clarify effects of added $H_2O$ for the downstream interaction between $H_2$-air and CO-air premixed flames in counterflow configuration. The reaction mechanism adopted was Davis model which had been known to be well in agreement with reliable experimental data. The results showed that both lean and rich flammable limits were reduced in increase of strain rate. The most discernible difference between the two with and without having $H_2O$ and/or $H_2$ addition into $H_2$-air and CO-air premixtures was two flammable islands for the former and one island for the latter at high strain flame conditions. Even a small amount of $H_2$, in which $H_2$-air premixed flame cannot be sustained by itself, participates in CO oxidation, thereby altering the CO-oxidation reaction path from the main reaction route $CO+O_2{\rightarrow}CO_2+O$ with a very long chemical time in CO-air flame to the OH-related reaction routes including $CO+OH{\rightarrow}CO_2+H$ with very short chemical times. This intrinsic nature alters flame stability maps appreciably. The results also showed that chemical effects of added $H_2O$ help lean flames at relatively low strain rate be sustained, and suppress the flame stabilization at high strain rates.
Keywords
Chemical interaction; Downstream interaction; $H_2O$ Addition; Lewis number;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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