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Numerical investigation of coal flamelet characteristics in a laminar counterflow with detailed chemistry

机译：层流逆流中煤小火焰特性的详细化学数值研究

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摘要

The characteristics of flamelets in coal flames stabilized in a laminar counterflow are numerically investigated with detailed chemistry. The behaviors of coal flamelet are compared with those of the gas flame let. In addition, the effects of strain rate, coal particle mass flow rate and coal particle size on the behaviors of coal flamelet are studied in both the physical space and the mixture fraction space. The results show that the characteristics of coal flamelet are significantly different from those of the gas flamelet. On the one hand, unlike the monotonicity of the gaseous mixture fraction, the coal particle mixture fraction is non-monotonic due to the interphase mass transfer. On the other hand, due to the nonmonotonicity of coal particle mixture fraction, the thermo-chemical quantities in the coal flame cannot be uniquely identified by a single variable of mixture fraction as those in the gas flame. It is also found that the strain rate, coal particle mass flow rate and coal particle size have significantly effects on the behaviors of coal flamelet. (C) 2017 Elsevier Ltd. All rights reserved.
机译：用详细的化学方法数值研究了层流逆流稳定的煤火焰中的小火焰特征。将煤小火焰的行为与气体火焰的行为进行了比较。此外，还研究了在物理空间和混合分数空间中，应变率，煤颗粒质量流量和煤颗粒尺寸对煤小火焰行为的影响。结果表明，煤火焰的特征与气体火焰的特征明显不同。一方面，与气态混​​合物级分的单调性不同，由于相间传质，煤颗粒混合物级分是非单调的。另一方面，由于煤颗粒混合物部分的非单调性，煤火焰中的热化学量不能像气体火焰中那样通过混合物分数的单个变量唯一地识别。还发现应变率，煤颗粒质量流速和煤颗粒尺寸对煤小火焰的行为有显着影响。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第may1期|232-242|共11页
  • 作者

    Wen Xu; Luo Kun; Jin Hanhui; Fan Jianren;

  • 作者单位

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Sch Aeronaut & Astronaut, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;

  • 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

    Counterflow flame; Coal combustion; Flamelet characteristics; Detailed chemistry;

    机译：逆流火焰;煤燃烧;火焰特性;详细化学;

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