• Title/Summary/Keyword: chemical interaction

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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)

  • 박정;권오붕;김태형;박종호
    • 한국연소학회지
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    • 제20권1호
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    • pp.6-14
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    • 2015

  • 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.

  • https://doi.org/10.15231/jksc.2015.20.1.006 인용 PDF KSCI