H2-공기와 CO-공기 예혼합 화염 사이의 후류상호작용에 있어서 H2O 첨가 효과
Effects of H2O Addition in Downstream Interaction between H2-Air and CO-Air Premixed Flames
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Numerical study was conducted to clarify effects of added H2O for the downstream interaction between H2-airand CO-air premixed flames in counterflow configuration. The reaction mechanism adopted was Davis modelwhich had been known to be well in agreement with reliable experimental data. The results showed thatboth lean and rich flammable limits were reduced in increase of strain rate. The most discernible differencebetween the two with and without having H2O and/or H2 addition into H2-air and CO-air premixtures wastwo flammable islands for the former and one island for the latter at high strain flame conditions. Even asmall amount of H2, in which H2-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 + O2 → CO2 + O witha very long chemical time in CO-air flame to the OH-related reaction routes including CO + OH → CO2 +H with very short chemical times. This intrinsic nature alters flame stability maps appreciably. The results alsoshowed that chemical effects of added H2O help lean flames at relatively low strain rate be sustained, andsuppress the flame stabilization at high strain rates.
Abstract
Numerical study was conducted to clarify effects of added H2O for the downstream interaction between H2-airand CO-air premixed flames in counterflow configuration. The reaction mechanism adopted was Davis modelwhich had been known to be well in agreement with reliable experimental data. The results showed thatboth lean and rich flammable limits were reduced in increase of strain rate. The most discernible differencebetween the two with and without having H2O and/or H2 addition into H2-air and CO-air premixtures wastwo flammable islands for the former and one island for the latter at high strain flame conditions. Even asmall amount of H2, in which H2-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 + O2 → CO2 + O witha very long chemical time in CO-air flame to the OH-related reaction routes including CO + OH → CO2 +H with very short chemical times. This intrinsic nature alters flame stability maps appreciably. The results alsoshowed that chemical effects of added H2O help lean flames at relatively low strain rate be sustained, andsuppress the flame stabilization at high strain rates.
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