东北大学学报（自然科学版）

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (8): 1173-1179.DOI: 10.12068/j.issn.1005-3026.2021.08.016

• 资源与土木工程 • 上一篇    下一篇

高温下掺氢天然气层流预混火焰传播特性

尚融雪， 杨悦， 李刚   

  1. (东北大学 资源与土木工程学院， 辽宁 沈阳110819)
  • 修回日期:2020-12-17 接受日期:2020-12-17 发布日期:2021-09-02
  • 通讯作者: 尚融雪
  • 作者简介:尚融雪(1987-)，女，辽宁沈阳人，东北大学讲师，博士; 李刚(1969-)，男，河南信阳人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51804065); 中国博士后科学基金资助项目(2018M631811); 中央高校基本科研业务费专项资金资助项目(N2001023).

Propagation of Laminar Premixed Flames of CH4/H2/Air Mixtures at Elevated Temperatures

SHANG Rong-xue， YANG Yue， LI Gang   

  1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Revised:2020-12-17 Accepted:2020-12-17 Published:2021-09-02
  • Contact: SHANG Rong-xue
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摘要： 利用本生灯-纹影系统及CHEMKIN-PRO对高温下掺氢天然气层流预混火焰传播速度进行实验及数值模拟研究，并从热力学及化学动力学效应方面讨论了初始温度对掺氢天然气层流预混火焰传播特性的影响.结果表明:GRI-3.0机理能较准确地预测293~500K条件下的掺氢天然气层流预混火焰传播速度;在相同初始温度下，混合物层流预混火焰传播速度在高掺氢比时增幅更显著;在相同当量比下，混合物层流预混火焰传播速度及绝热火焰温度随初始温度的升高呈近线性增加;高温下，H自由基浓度的增大进一步增强了H+O2=O+OH对整体燃烧反应的促进作用，使混合物层流预混火焰传播速度显著加快.

关键词: 本生灯法;层流火焰;火焰传播;掺氢比;GRI-3.0机理

Abstract: The laminar flame speeds of CH4/H2/air mixtures were experimentally studied at elevated initial temperatures using the Bunsen burner method combined with the Schlieren technique， and the corresponding cases were computed using CHEMKIN-PRO. The effect of initial temperatures on the propagation characteristics of laminar premixed flames was discussed from the perspectives of thermodynamics and chemical kinetics. The results show that the laminar flame speeds of the mixtures at 293-500K can be predicted well by GRI-3.0 mechanism. The greater increments of laminar flame speeds of mixtures are presented at higher H2 fractions under all tested initial temperatures. The laminar flame speeds and adiabatic flame temperatures of mixtures almost linearly increase with a growth of initial temperatures with the same equivalence ratios. With the rise of initial temperatures， the dominant promotion of H+O2=O+OH on the mass burning rates of mixtures can be enhanced by the great growth of the mole fractions of H radicals. Therefore， the laminar flame speed of CH4/H2/air mixtures significantly increases at elevated temperatures.

Key words: Bunsen burner; laminar flame; flame propagation; H2 fraction; GRI-3.0 mechanism

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