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首页> 外文期刊>Fuel >Spatial structure and NO formation of a laminar methane-nitrogen jet in hot coflow under MILD conditions: A spontaneous Raman and LIF study
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Spatial structure and NO formation of a laminar methane-nitrogen jet in hot coflow under MILD conditions: A spontaneous Raman and LIF study

机译：轻度条件下热同流中层状甲烷-氮气射流的空间结构和NO形成：自发拉曼和LIF研究

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摘要

We report the spatial structure of the reaction zone from a diluted, preheated fuel jet in hot coflowing oxidizer in laminar flow, using an axisymmetric laminar-jet-in-hot-coflow (LJHC) burner. In the experiments, a preheated CH_4/N_2 (20/80) mixture at ~1100 K flows into the 1500 K products of a flat, premixed burner-stabilized flame, having 3 mol% residual oxygen. Measurements of major species and temperature profiles using spontaneous Raman scattering show a temperature rise in the reaction zone of less than 300 K, indicating that the reaction zone was in the MILD combustion regime. Analysis of the data shows that the spatial development of the combustion has the characteristics of an "ordinary" coflow diffusion flame, but with changes in temperature and species fractions due to combustion that are nearly an order of magnitude smaller than when using undiluted reactants. Measurements of profiles of NO mole fraction using Laser Induced Fluorescence (LIF) show that the contribution of the MILD combustion to the NO fraction is less than 2 ppm, in agreement with other studies on MILD combustion in turbulent flows. Analysis of the NO fraction as a function of mixture fraction indicates that the NO field is dominated by mixing of the NO formed in the coflow with the reaction products of the diluted fuel, with negligible NO formation from the fuel. Replacement of the nitrogen in the hot coflow with argon resulted in NO fractions below the detection limit of the measurement system.
机译：我们报告了使用轴向对称的层流喷射热流（LJHC）燃烧器，在层流的热同流氧化剂中稀释，预热的燃料射流反应区的空间结构。在实验中，约1100 K的预热CH_4 / N_2（20/80）混合物流入具有3 mol％残余氧气的1500 K扁平，预混合燃烧器稳定火焰的产品中。使用自发拉曼散射进行的主要物种和温度分布的测量显示，反应区的温度升高小于300 K，表明该反应区处于MILD燃烧状态。数据分析表明，燃烧的空间发展具有“普通”同流扩散火焰的特征，但是由于燃烧引起的温度和物种分数变化比使用未稀释的反应物时小近一个数量级。使用激光诱导荧光（LIF）测量NO摩尔分数的分布图表明，MILD燃烧对NO分数的贡献小于2 ppm，这与湍流中MILD燃烧的其他研究一致。对NO分数作为混合物分数的函数的分析表明，NO场主要由混合气流中形成的NO与稀释燃料的反应产物混合而形成，而从燃料中形成的NO很少。用氩气替换热气流中的氮导致NO含量低于测量系统的检测极限。

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  • 来源
    《Fuel》 |2013年第1期|705-710|共6页
  • 作者

    A.V. Sepman; A.V. Mokhov; H.B. Levinsky;

  • 作者单位

    Laboratory for High Temperature Energy Conversion Processes, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands;

    Laboratory for High Temperature Energy Conversion Processes, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands;

    Laboratory for High Temperature Energy Conversion Processes, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands,KEMA Nederland B.V., P.O. Box 2029, 9704 CA Groningen, The Netherlands;

  • 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

    MILD combustion; NO formation; raman; laser induced fluorescence;

    机译：轻度燃烧;没有形成;拉曼激光诱导荧光;

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