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Effect of temperature on soot inception in highly controlled counterflow ethylene diffusion flames

机译：温度对高度控制的逆流乙烯扩散火焰中烟灰起始的影响

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摘要

Soot volume fraction and dispersion index measurements were performed by multi-color pyrometry in a series of highly controlled ethylene counterflow diffusion flames in which the peak temperature was varied in a 300K range, while maintaining constant stoichiometric mixture fraction and global strain rate. In so doing, the temperature-convective time history remained nearly constant, when the temperature was normalized with respect to its peak value. Therefore, the peak temperature was isolated as the key controlling parameter. We observed two distinct trends in the soot measurements: a high-temperature, high activation energy process near the flame front, for temperatures larger than 1600K, that can be rationalized with conventional nucleation and surface growth models; and a low temperature zero-activation process that is hypothesized as dimerization (homogenous nucleation) of aromatics. The first process is accompanied initially by large values of the dispersion index, denoting small C/H ratios, followed by a rapid decrease towards a plateau, as soot carbonization occurs. The second process is accompanied by a sharp increase in the dispersion index, consistent with a new inception process that is well distinct from that in the high temperature region. In one of the flames studied the soot measurements supplement an extensive set of measurements of gaseous species from a previous study, thereby offering a comprehensive database for modelers. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：在一系列高度受控的乙烯逆流扩散火焰中，通过多色高温法进行烟灰体积分数和弥散指数的测量，其中峰值温度在300K范围内变化，同时保持恒定的化学计量混合物分数和整体应变率。这样，当温度相对于其峰值进行归一化时，温度对流时间历史几乎保持恒定。因此，峰值温度被隔离为关键控制参数。我们在烟灰测量中观察到两个明显的趋势：火焰前沿附近的高温，高活化能过程，温度大于1600K，可以通过常规成核和表面生长模型进行合理化；低温零活化过程被假设为芳烃的二聚化（均相成核）。第一个过程最初伴随着较大的分散指数值（表示较小的C / H比），随后随着碳黑碳化的发生而迅速下降至平稳状态。第二个过程伴随着色散指数的急剧增加，这与一个新的起始过程是一致的，该过程与高温区域的显着不同。在所研究的一种火焰中，烟尘测量值补充了先前研究中大量的气态物种测量值，从而为建模人员提供了一个全面的数据库。 （C）2018年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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  • 来源
    《Combustion and Flame》 |2018年第6期|283-294|共12页
  • 作者

    Gleason Kevin; Carbone Francesco; Gomez Alessandro;

  • 作者单位

    Yale Univ, Dept Mech Engn & Mat Sci, Yale Ctr Combust Studies, 9 Hillhouse Ave, New Haven, CT 06520 USA;

    Yale Univ, Dept Mech Engn & Mat Sci, Yale Ctr Combust Studies, 9 Hillhouse Ave, New Haven, CT 06520 USA;

    Yale Univ, Dept Mech Engn & Mat Sci, Yale Ctr Combust Studies, 9 Hillhouse Ave, New Haven, CT 06520 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

    Soot; Diffusion flames; Nucleation; Optical diagnostics;

    机译：烟灰;扩散火焰;成核;光学诊断;

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