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A numerical study of laminar flame speed of stratified syngas/air flames

机译：分层合成气/空气火焰层流火焰速度的数值研究

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摘要

Numerical simulations are performed to study the flame propagation of laminar stratified syngas/air flames with the San Diego mechanism. Effects of fuel stratification, CO/H-2 mole ratio and temperature stratification on flame propagation are investigated through comparing the distribution of flame temperature, heat release rate and radical concentration of stratified flame with corresponding homogeneous flame. For stratified flames with fuel rich-to-lean and temperature high-to-low, the flame speeds are faster than homogeneous flames due to more light H radical in stratified flames burned gas. The flame speed is higher for case with larger stratification gradient. Contrary to positive gradient cases, the flame speeds of stratified flames with fuel lean-to-rich as well as with temperature low-to-high are slower than homogeneous flames. The flame propagation accelerates with increasing hydrogen mole ratio due to higher H radical concentration, which indicates that chemical effect is more significant than thermal effect. Additionally, flame displacement speed does not match laminar flame speed due to the fluid continuity. Laminar flame speed is the superposition of flame displacement speed and flow velocity. (C)2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译：进行了数值模拟，以研究具有圣地亚哥机制的层状分层合成气/空气火焰的火焰传播。通过比较分层火焰与相应均质火焰的火焰温度分布，放热率和自由基浓度，研究了燃料分层，CO / H-2摩尔比和温度分层对火焰传播的影响。对于分层燃烧的燃料，其浓淡比浓，温度从高到低，由于分层火焰中燃烧的气体中含有更多的轻H自由基，因此火焰速度比均质火焰要快。对于分层梯度较大的情况，火焰速度较高。与正梯度情况相反，燃料从浓到稀以及温度从低到高的分层火焰的火焰速度都比均质火焰慢。由于氢自由基浓度的增加，火焰的传播随着氢摩尔比的增加而加速，这表明化学作用比热作用更重要。另外，由于流体的连续性，火焰位移速度与层流火焰速度不匹配。层流火焰速度是火焰位移速度和流速的叠加。 （C）2018氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

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  • 来源
    《International journal of hydrogen energy》 |2018年第18期|9036-9045|共10页
  • 作者

    Wei Wei; Yu Zhou; Zhou Taotao; Ye Taohong;

  • 作者单位

    Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Hefei 230027, Anhui, Peoples R China;

    Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Hefei 230027, Anhui, Peoples R China;

    Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Hefei 230027, Anhui, Peoples R China;

    Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Hefei 230027, Anhui, Peoples R China;

  • 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

    Syngas/air stratified flame; Laminar flame speed; Flame displacement speed; Differential diffusion;

    机译：合成气/空气分层火焰;层流火焰速度;火焰位移速度;微分扩散;

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