首页> 外文期刊>International journal of hydrogen energy >Important role of chemical interaction on flame extinction in downstream interaction between stretched premixed H_2-air and GO-air flames
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Important role of chemical interaction on flame extinction in downstream interaction between stretched premixed H_2-air and GO-air flames

机译:化学相互作用对火焰的消解在拉伸的预混H_2-air和GO-air火焰下游相互作用中的重要作用

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摘要

Important role of chemical interaction in flame extinction is numerically investigated in downstream interaction among lean (rich) and lean (rich) premixed as well as partially premixed H_2- and CO-air flames. The strain rate varies from 30 to 5917 s~(-1) until interacting flames cannot be sustained anymore. Flame stability diagrams mapping lower and upper limit fuel concentrations for flame extinction as a function of strain rate are presented. Highly stretched interacting flames are survived only within two islands in the flame stability map where partially premixed mixture consists of rich H2-air flame, extremely lean CO-air flame, and a diffusion flame. Further increase in strain rate finally converges to two points. It is found that hydrogen penetrated from H2-air flame (even at lean flame condition) participates in CO oxidation vigorously due to the high diffusivity such that it modifies the slow main reaction route CO + O_2 →CO_2 + O into the fast cyclic reaction route involving CO + OH →CO_2 + H. These chemical interactions force even rich extinction boundaries with deficient reactant Lewis numbers larger than unity to be slanted at high strain rate. Appreciable amount of hydrogen in the side of lean H_2-air flame also oxidizes the CO penetrated from CO-air flame, and this reduces flame speed of the H_2-air flame, leading to flame extinction. At extremely high strain rates, interacting flames are survived only by a partially premixed flame such that it consists of a very rich H_2-air flame, an extremely lean CO-air flame, and a diffusion flame. In such a situation, both the weaker H_2-and CO-air flames are parasite on the stronger diffusion flame such that it can lead to flame extinction in the situation of weakening the stronger diffusion flame. Important role of chemical interaction in flame extinction is discussed in detail.
机译:在稀(浓)和稀(浓)预混合以及部分预混合的H_2和CO空气火焰之间的下游相互作用中,对化学相互作用在熄灭火焰中的重要作用进行了数值研究。应变速率在30到5917 s〜(-1)之间变化,直到不再持续存在相互作用的火焰为止。给出了火焰稳定图,该图绘制了用于熄灭的上限和下限燃料浓度与应变率的函数关系。高度拉伸的相互作用火焰仅在火焰稳定性图中的两个岛中幸存,其中部分预混合的混合物由浓H2空气火焰,极稀薄的CO空气火焰和扩散火焰组成。应变率的进一步提高最终收敛到两点。发现从H2空气火焰(即使在稀薄火焰条件下)渗透的氢由于高扩散性而剧烈地参与CO氧化,从而将缓慢的主反应路线CO + O_2→CO_2 + O修改为快速循环反应路线这些化学相互作用迫使即使是丰富的消光边界,反应物路易斯数小于1的不足路易斯数也要在高应变速率下倾斜。稀的H_2空气火焰侧的大量氢气也会氧化从CO空气火焰渗透的CO,这会降低H_2空气火焰的火焰速度,从而导致火焰熄灭。在极高的应变率下,相互作用的火焰只能通过部分预混的火焰来幸存,因此它由非常浓的H_2空气火焰,极其稀薄的CO空气火焰和扩散火焰组成。在这种情况下,较弱的H_2和CO空气火焰都寄生在较强的扩散火焰上,从而在减弱较强的扩散火焰的情况下会导致火焰熄灭。详细讨论了化学相互作用在熄灭火焰中的重要作用。

著录项

  • 来源
    《International journal of hydrogen energy》 |2013年第15期|6537-6551|共15页
  • 作者单位

    Dept. of Mechanical and Automotive Engineering, Keimyung University, 1095 Dalgubeol-daero, Daegu 704-701, Republic of Korea;

    ,Dept. of Mechanical Engineering, Pufeyong National University, 365 Sinseon-ro, Namgu, Busan 608-739, Republic of Korea;

    Dept. of Mechanical Engineering, Pufeyong National University, 365 Sinseon-ro, Namgu, Busan 608-739, Republic of Korea;

    ,Dept. of Mechanical Engineering, Chungnam national University, Kung-dong, Yuseong, Deaden 305-764, Republic of Korea;

    Dept. of Mechanical Engineering, Pufeyong National University, 365 Sinseon-ro, Namgu, Busan 608-739, Republic of Korea;

    ,Dept. of Mechanical Engineering, Chungnam national University, Kung-dong, Yuseong, Deaden 305-764, Republic of Korea;

    Dept. of Mechanical Engineering, Pufeyong National University, 365 Sinseon-ro, Namgu, Busan 608-739, Republic of Korea;

    ,Dept. of Mechanical Engineering, Chungnam national University, Kung-dong, Yuseong, Deaden 305-764, Republic of Korea;

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

    ,Dept. of Mechanical Engineering, Chungnam national University, Kung-dong, Yuseong, Deaden 305-764, Republic of Korea;

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

    ,Dept. of Mechanical Engineering, Chungnam national University, Kung-dong, Yuseong, Deaden 305-764, Republic of Korea;

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

    Chemical interaction; Downstream interaction; Flame stability map; Lewis number;

    机译:化学相互作用下游互动;火焰稳定性图;刘易斯数;
  • 入库时间 2022-08-18 00:27:44

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