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首页> 外文期刊>Combustion and Flame >Mixing characteristics and emissions of strongly-forced non-premixed and partially-premixed jet flames in crossflow
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Mixing characteristics and emissions of strongly-forced non-premixed and partially-premixed jet flames in crossflow

机译：强力非预混和部分预混射流在错流中的混合特性和排放

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摘要

The effects of forcing and partial premixing on the mixing characteristics and pollutant emissions of jet flames in crossflow (JFICF) are studied experimentally for 70% methane/30% hydrogen fuel blend and propane. For forced non-premixed JFICF, the jet fuel flow is modulated using an acoustic speaker system, which results in a drastic decrease in flame length and soot luminosity. Simultaneous planar laser Mie scattering and CH* chemiluminescence imaging is used to detail the flame structure and dynamics of the reacting forced non-premixed JFICF, whereas acetone planar laser-induced fluorescence is used to quantify the near-field mixing of the non-reacting case. Forced JFICF are characterized by periodic ejections of high-momentum, deeply penetrating vortical structures, which draw air into the jet nozzle and enhance mixing in the near-field region of the jet. The mixing enhancement effectively partially premixes the jet fluid below the flame base. Flame luminosity images and exhaust gas emissions measurements show that forced non-premixed JFICF exhibit similar characteristics to unforced partially-premixed JFICF. Both strong forcing and partial premixing result in net reductions in NO*, but increases in CO and unburned hydrocarbons. NO_x scaling analysis is presented for both forced non-premixed and unforced partially premixed flames. Using flame volume arguments, EI_(NO_x) scales with amplitude ratio, but does not scale with partial premixing. The difference in scaling behavior is attributed to differences in flame structure.
机译：以70％甲烷/ 30％氢燃料混合物和丙烷为实验对象，研究了强制和部分预混合对横流（JFICF）喷射火焰混合特性和污染物排放的影响。对于强制非预混JFICF，使用燃油扬声器系统调节喷气燃料的流量，这会导致火焰长度和烟尘发光度急剧下降。平面激光同时进行Mie散射和CH *化学发光成像，以详细说明反应的强制非预混JFICF的火焰结构和动力学，而丙酮平面激光诱导的荧光用于量化非反应情况的近场混合。强制JFICF的特点是周期性喷射高动量，深穿透的涡旋结构，这些结构将空气吸入喷嘴，并增强喷嘴近场区域的混合。混合增强有效地预混合了火焰底部以下的射流。火焰光度图像和废气排放测量结果表明，强制非预混JFICF与非强制部分预混JFICF具有相似的特性。强力和部分预混合都会导致NO *的净减少，但CO和未燃烧的碳氢化合物增加。针对强制非预混火焰和非强制部分预混火焰提供了NO_x结垢分析。使用火焰体积参数，EI_（NO_x）随振幅比缩放，但不与部分预混缩放。结垢行为的差异归因于火焰结构的差异。

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  • 来源
    《Combustion and Flame》 |2012年第2期|p.707-721|共15页
  • 作者

    K.C. Marr; N.T. Clemens; O.A. Ezekoye;

  • 作者单位

    Department of Aerospace Engineering and Engineering Mechanics, 1 University Station C0600, The University of Texas at Austin, Austin, Texas, 787X2, United States;

    Department of Aerospace Engineering and Engineering Mechanics, 1 University Station C0600, The University of Texas at Austin, Austin, Texas, 787X2, United States;

    Department of Mechanical Engineering. ! University Station C2200, The University of Texas at Austin, Austin, Texas, 78712, United States;

  • 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

    pulsed combustion; turbulent mixing; non-premixed flames; partially-premixed flames; pollutant emissions; NO_x scaling;

    机译：脉冲燃烧湍流混合非预混火焰;部分预混火焰;污染物排放;NO_x缩放;

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