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Experimental study of bluff-body stabilized LPG-H_2 jet diffusion flame with preheated reactant

机译：预热反应物的钝体稳定LPG-H_2射流扩散火焰的实验研究

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摘要

The effects of hydrogen, H_2 addition and preheated reactants on bluff-body stabilized LPG-H_2 diffusion flame for two cases namely, (I) preheated air and (II) preheated air and fuel are reported in the present paper. Results confirm that the H_2 addition leads to a reduction in flame length. Besides this, the flame length is also observed to be reduced with increasing reactant temperature and lip thickness of the bluff-body. The soot free length fraction (SFLF) for both cases is observed to be increased with H_2 addition to fuel stream, which might have caused due to decrease in the C/H ratio in the flame. Interestingly, the SFLF is observed to be reduced with increasing lip thickness and reactants temperature, which can be attributed to the attenuation in induction period of soot formation and enhanced soot volume fraction, respectively. The NO_x emission level is found to be decreased in coaxial burner with hydrogen addition for both case I and II. In contrast, it is observed to be enhanced in bluff-body stabilized flame. The former can be ascribed to the reduction in residence time of gas mixture, whereas the latter can be explained on the basis of enhanced flame temperature. Besides this, emission index of NO_x (EINO_x) is also found to be enhanced with increase in lip thickness and reactant temperature which may be caused due to both enhanced residence time and thermal effect, respectively.
机译：本文报道了氢，H_2的添加和预热反应物对钝体稳定的LPG-H_2扩散火焰的影响，这两种情况是（I）预热空气和（II）预热空气和燃料。结果证实，H_2的添加导致火焰长度的减少。除此之外，还观察到火焰长度随着反应温度和钝体唇缘厚度的增加而减小。观察到两种情况的烟尘自由长度分数（SFLF）随燃料流中H_2的增加而增加，这可能是由于火焰中C / H比的降低所致。有趣的是，观察到SFLF随着唇缘厚度和反应物温度的增加而降低，这可以分别归因于烟灰形成诱导期的衰减和烟灰体积分数的增加。发现在情况I和情况II下，添加氢气后，同轴燃烧器的NO_x排放水平均降低。相反，观察到在钝体稳定的火焰中其增强。前者可归因于气体混合物停留时间的减少，而后者可基于提高的火焰温度来解释。除此之外，还发现NO_x（EINO_x）的排放指数随着分别由于滞留时间和热效应的增加而引起的唇部厚度和反应物温度的增加而增强。

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  • 来源
    《Fuel》 |2010年第1期|212-218|共7页
  • 作者

    D.P. Mishra; P. Kumar;

  • 作者单位

    Combustion Lab, Department of Aerospace Engineering, Indian institute of Technology, Kanpur 208 016, India;

    Combustion Lab, Department of Aerospace Engineering, Indian institute of Technology, Kanpur 208 016, India;

  • 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

    LPG-H_2; jet diffusion flame; preheated reactants; bluff body lip thickness;

    机译：LPG-H_2;射流扩散火焰预热的反应物虚张声势的身体嘴唇厚度;

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