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首页> 外文期刊>International journal of hydrogen energy >Flame structure changes resulting from hydrogen-enrichment and pressurization for low-swirl premixed methane-air flames
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Flame structure changes resulting from hydrogen-enrichment and pressurization for low-swirl premixed methane-air flames

机译：低旋流预混甲烷-空气火焰的富氢和加压导致火焰结构变化

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摘要

With the current focus on alternate and renewable fuels, fuel flexibility has become a driving factor in the design of new turbines. Flame stability is heavily impacted by the presence of hydrogen in the fuel stream (as is common in many alternative fuels). This study examines how the flame dynamics change in response to the systematic addition of hydrogen in a low-swirl lean premixed methane-air burner. Stability maps for these test cases show that adding hydrogen broadens the blow-off limits, with 20% hydrogen resulting in a 7% change while 40% hydrogen results in a 35% larger stable region. The most dramatic manifestation of hydrogen addition is the greatly decreased radius of curvature of the local flame surface, which is visible from the increased wrinkling of the flame front. Increases in both pressure and hydrogen enrichment result in higher means and variances of flame front curvatures. The flame surface density is in agreement with the aforementioned flame front curvature PDFs in that increasing the pressure and hydrogen concentration leads to an increase in the maximum flame surface density.
机译：在当前关注替代燃料和可再生燃料的情况下，燃料灵活性已成为新型涡轮机设计的驱动因素。燃料流中氢气的存在会严重影响火焰的稳定性（这在许多替代燃料中很常见）。这项研究研究了在低旋流稀薄的甲烷-空气混合燃烧器中，火焰动力学如何响应于系统地添加氢气而变化。这些测试案例的稳定性图显示，添加氢会扩大吹散极限，其中20％的氢导致7％的变化，而40％的氢导致35％的稳定区域。加氢的最显着表现是局部火焰表面的曲率半径大大减小，这从火焰前部皱纹的增加可以看出。压力和氢富集的增加导致较高的均值和火焰前曲率的变化。火焰表面密度与前述的火焰前曲率PDF一致，因为增加压力和氢浓度导致最大火焰表面密度增加。

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  • 来源
    《International journal of hydrogen energy》 |2012年第13期|p.10397-10404|共8页
  • 作者

    Majid Emadi; Douglas Karkow; Taleb Sdlameh; Ameet Gohil; Albert Ratner;

  • 作者单位

    Department of Mechanical and Industrial Engineering, University of Iowa, 3131 Seamans Center, Iowa City, IA 52242, USA;

    Department of Mechanical and Industrial Engineering, University of Iowa, 3131 Seamans Center, Iowa City, IA 52242, USA;

    Department of Mechanical and Industrial Engineering, University of Iowa, 3131 Seamans Center, Iowa City, IA 52242, USA;

    Department of Mechanical and Industrial Engineering, University of Iowa, 3131 Seamans Center, Iowa City, IA 52242, USA;

    Department of Mechanical and Industrial Engineering, University of Iowa, 3131 Seamans Center, Iowa City, IA 52242, USA;

  • 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

    low-swirl burner; high-pressure combustion; hydrogen-methane mixture; stability map; flame surface density;

    机译：低旋流燃烧器;高压燃烧氢-甲烷混合物;稳定性图;火焰表面密度;

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