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Effects of CO_2 addition on flame extinction in interacting H_2-air and CO-air premixed flames

机译：H_2-空气和CO-空气预混火焰中添加CO_2对消光的影响

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摘要

The effects of CO_2 addition on the downstream interactions of H_2-air and CO-air premixed flames were investigated. Flame stability diagrams mapping the extinction limits for various fuel concentrations as functions of the strain rate were developed for the downstream interactions between H_2-air and CO-air premixed flames with 0-20% CO_2 addition. Of particular concern was the impact of the chemical reactions of the additional CO_2 on the flame extinction characteristics. The results showed that CO_2 addition suppressed the flammable regions appreciably and decreased the critical strain rate, opening up the lean extinction boundary. For highly stretched interacting flames, two flammable island regions on the maps were combined into one when 10% or 20% CO_2 was added to either the H_2-air or CO-air premixed mixtures. The chemical reactions of the additional CO_2 were significant, especially for high strain rate flames, while the effect of the radiative heat loss of the additional CO_2 was minor, even for low strain rate flames. Such chemical reactions were determined by competition between the reaction steps for the consumption and production of HCO and the reverse reaction of CO + OH = CO_2 + H with the reaction step of H + O_2 → O + OH, an indicator of the overall reaction rate for the H atoms. This resulted in a weakened interacting flame. Such chemical reactions of the additional CO_2 were examined in detail to describe the flame characteristics.
机译：研究了CO_2添加对H_2-空气和CO-空气预混火焰下游相互作用的影响。针对添加有0-20％CO_2的H_2-空气和CO-空气预混火焰之间的下游相互作用，绘制了将各种燃料浓度的极限值作为应变率函数映射的火焰稳定性图。特别令人关注的是额外的CO_2的化学反应对火焰熄灭特性的影响。结果表明，CO_2的加入显着抑制了易燃区域，降低了临界应变率，打开了稀薄的消光边界。对于高度拉伸的相互作用火焰，当将10％或20％CO_2添加到H_2空气或CO空气预混混合物中时，地图上的两个易燃岛区域被合并为一个。额外的CO_2的化学反应非常明显，特别是对于高应变速率的火焰，而额外的CO_2的辐射热损失的影响很小，即使对于低应变速率的火焰也是如此。这种化学反应是通过消耗HCO和生产HCO的反应步骤之间的竞争以及CO + OH = CO_2 + H与H + O_2→O + OH的反应步骤的逆反应来确定的，H + O_2→O + OH是总反应速率的指标对于氢原子。这导致相互作用的火焰减弱。详细检查了额外的CO_2的这种化学反应，以描述火焰特性。

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  • 来源
    《Fuel》 |2014年第15期|69-78|共10页
  • 作者

    Seung Wook Jung; Jeong Park; Oh Boong Kwon; Young Ju Kim; Sang In Keel; Jin Han Yun; In Gweon Lim;

  • 作者单位

    Dept. of Mechanical Engineering and Interdisciplinary Program of Marine-Bio, Electric & Mechanical Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Busan 608-739, Republic of Korea;

    Dept. of Mechanical Engineering and Interdisciplinary Program of Marine-Bio, Electric & Mechanical Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Busan 608-739, Republic of Korea;

    Dept. of Mechanical Engineering and Interdisciplinary Program of Marine-Bio, Electric & Mechanical Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Busan 608-739, Republic of Korea;

    Power Generation Research Laboratory, Korea Electric Power Research Institute, 65, Munji-ro, Yuseong, Daejeon 305-760, Republic of Korea;

    Environment & Energy Research Division, Korea Institute of Machinery and Materials, 171, Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea;

    Environment & Energy Research Division, Korea Institute of Machinery and Materials, 171, Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea;

    Dept. of Mechanical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 449-728, Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Artificial species; Chemical effect; Downstream interaction; Extinction boundary; Strain rate;

    机译：人工物种;化学作用;下游互动;灭绝边界;应变率;

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