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首页> 外文期刊>Combustion and Flame >Effects of water vapor addition to the air stream on soot formation and flame properties in a laminar coflow ethylene/air diffusion flame
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Effects of water vapor addition to the air stream on soot formation and flame properties in a laminar coflow ethylene/air diffusion flame

机译：气流中添加水蒸气对层流共流乙烯/空气扩散火焰中烟灰形成和火焰特性的影响

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摘要

The effects of adding water vapor to the air stream on flame properties and soot volume fraction were investigated numerically in a laminar coflow ethylene/air diffusion flame at atmospheric pressure by solving the fully elliptic conservation equations and using a detailed C_2 reaction mechanism including PAH up to pyrene and detailed thermal and transport properties. Thermal radiation was calculated using the discrete-ordinates method and a statistical narrow-band correlated-k based wide band model for the absorption coefficients of CO_2 and H_2O. Soot formation was modeled using a PAH based inception model and the HACA mechanism for surface growth and oxidation. Addition of water vapor significantly reduces radiation heat loss from the flame primarily through reduced soot loading and flame temperature. The added water vapor affects soot formation and flame properties through not only dilution and thermal effects, but also through chemical effect. The chemical effect is as significant as the dilution and thermal effects. The primary pathway for the chemical effect of water vapor is the reverse reaction of OH + H_2 -(←→) H + H_2O. Our numerical results confirm that the reduced H radical concentration leads to lower PAH concentrations and consequently lower soot inception rates. In contrast, the radiation effect due to the added water vapor was found to have a minor influence on both flame structure and soot formation in the laminar diffusion flame investigated.
机译：在层流共流乙烯/空气扩散火焰中，在大气压力下，通过求解完全椭圆守恒方程并使用包括PAH在内的详细的C_2反应机理，研究了向气流中添加水蒸气对火焰特性和烟灰体积分数的影响。 and和详细的热和输运性质。使用离散坐标法和基于统计窄带相关k的宽带模型计算CO_2和H_2O的吸收系数，计算热辐射。使用基于PAH的初始模型和用于表面生长和氧化的HACA机制对烟灰的形成进行建模。水蒸气的添加主要通过减少烟灰负荷和火焰温度来显着减少火焰的辐射热损失。添加的水蒸气不仅通过稀释和热效应，而且还通过化学效应，影响烟灰的形成和火焰特性。化学作用与稀释和热作用一样重要。水蒸气的化学作用的主要途径是OH + H_2-（←→）H + H_2O的逆反应。我们的数值结果证实，降低的H自由基浓度导致较低的PAH浓度，因此降低了烟灰的发生率。相反，发现由于所添加的水蒸气引起的辐射效应对所研究的层状扩散火焰中的火焰结构和烟灰形成均具有较小的影响。

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  • 来源
    《Combustion and Flame》 |2014年第7期|1724-1734|共11页
  • 作者

    Fengshan Liu; Jean-Louis Consalvi; Andres Fuentes;

  • 作者单位

    Measurement Science and Standards, National Research Council Canada, Building M-9, 1200 Montreal Road, Ottawa, ON K1A 0R6, Canada;

    Aix-Marseille Universite, IUSTI/UMR CNRS 7343, 5 rue E. Fermi, 13453 Marseille Cedex 13, France;

    Departamento de Industrias, Universidad Tecnica Federico Santa Maria, Av. Espana 1680, Valparaiso, Chile;

  • 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

    Laminar diffusion flame; Soot formation; Water vapor addition; Thermal radiation;

    机译：层流扩散火焰;烟灰形成;加水蒸气;热辐射;

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