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Explosion behavior predictions of syngas/air mixtures with dilutions at elevated pressures: Explosion and intrinsic flame instability parameters

机译：在高压下稀释的合成气/空气混合物的爆炸行为预测：爆炸和固有火焰不稳定性参数

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摘要

Explosion processes of H-2/CO/air mixtures with diluents are experimentally investigated with a confined vessel. Explosion pressure and maximum rate of pressure rise are obtained and results show that explosion pressure increases firstly and then decreases with increasing equivalence ratios. The maximum rate of pressure rise increases all the time when the combustible mixture becomes richer. When CO2 and H2O are added into the mixture, both explosion pressure and maximum rate of pressure rise decrease and CO2 addition has a stronger effect. Except for the explosion parameters, intrinsic flame instability parameters are also needed in order to evaluate the deflagration index of full-scale cases at higher pressure from lab-scale experiment. When CO2 and H2O are added into the mixture, both Markstein length and critical Peclet number decrease and the effect of CO2 is stronger. For critical radius, it is always decreasing with the addition of diluents but H2O addition may lead to the postponing of the onset of self-acceleration when CO/H-2 ratio is higher. Linear instability theory could predict the critical radius quantitatively, but it is not accurate enough. The acceleration exponent increases firstly after the flame radius is larger than a critical value and then reaches a constant value of around 1.18, which is quite different from theoretical one, 1.5. In addition, the average cell sizes are obtained by theoretical calculation and results show CO2 and H2O have the similar effect on the cellular structure and intrinsic flame instability of syngas mixture and the effect of CO2 is relatively stronger.
机译：用密闭容器对H-2 / CO /空气混合物与稀释剂的爆炸过程进行了实验研究。得到了爆炸压力和最大压力上升率，结果表明，当量比增大时，爆炸压力先增大后减小。当可燃混合物变得更浓时，最大的压力升高速率一直在增加。当将CO2和H2O添加到混合物中时，爆炸压力和最大压力上升速率都会降低，并且添加CO2的效果更强。除了爆炸参数外，还需要固有的火焰不稳定性参数，以便通过实验室规模的实验来评估在较高压力下满量程情况下的爆燃指数。当向混合物中添加CO2和H2O时，Markstein长度和临界Peclet数均降低，并且CO2的作用更强。对于临界半径，它总是随着稀释剂的添加而减少，但是当CO / H-2比率较高时，H2O的添加可能会导致自加速的开始推迟。线性不稳定性理论可以定量地预测临界半径，但是不够精确。在火焰半径大于临界值之后，加速度指数首先增加，然后达到约1.18的恒定值，这与理论值1.5完全不同。此外，通过理论计算获得了平均泡孔尺寸，结果表明，CO 2和H 2 O对合成气混合物的泡孔结构和固有火焰不稳定性具有相似的作用，并且CO 2的作用相对较强。

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  • 来源
    《Fuel》 |2019年第1期|115724.1-115724.10|共10页
  • 作者

    Xie Yongliang; Wang Xujiang; Wang Jinhua; Huang Zuohua;

  • 作者单位

    Southwest Jiaotong Univ, Sch Mech Engn, Chengdu 610031, Sichuan, Peoples R China;

    UCL, Dept Mech Engn, Torrington Pl, London WC1E 7JE, England;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China;

  • 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

    Syngas; Intrinsic flame instability; Explosion; Dilutions;

    机译：合成气;内在火焰不稳定;爆炸;稀释雨;

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