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Numerical study of CO2 effects on laminar non-premixed biogas flames employing a global kinetic mechanism and the Flamelet-Generated Manifold technique

机译：利用整体动力学机制和小火焰产生歧管技术对层流非预混合沼气火焰中CO2效应的数值研究

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摘要

Numerical simulations of flames employing detailed kinetic mechanisms are computationally demanding problems. For this reason, reduced mechanisms and techniques of chemical kinetic reduction have been developed and used in both research and industrial applications. The objective of the present work is to compare the prediction of a global kinetic mechanism and the Flamelet-Generated Manifold (FGM) reduction technique with a detailed mechanism in numerical simulations of laminar non-premixed flames. The fuel was a biogas-like mixture modelled as methane diluted with carbon dioxide. First, the effect of CO2 addition into fuel stream was studied in one-dimensional counterflow flames. Flame structure and chemical kinetics were investigated for different levels of CO2. A new approach for evaluating the dilution effect is introduced based on the CO2 content in a stoichiometric mixture. With this definition, the effect of pure dilution on major species and temperature peak values tends to be linear. The comparisons among solutions obtained with a detailed, a skeleton and a 4-step global mechanism for different strain rates and dilution levels reveals the capabilities of these chemical kinetic approaches for modelling biogas flames. Then, the 4-step mechanism and the FGM technique were compared with a skeleton kinetic model in two-dimensional coflow flames. It was observed that the 4-step mechanism presented good results for temperature and major chemical species, being a good choice when these fields are desired. On the other hand, the FGM technique presented better quantitative results with the advantage of providing detailed information about the flame composition with lower computational time. For the FGM technique, the capability of different progress variable definitions in reproducing the composition space of CO2 diluted flames is investigated and discussed in detail. The chemical and pure dilution effects of CO2 addition to the fuel stream are also discussed for the two-dimensional results. (C) 2017 Elsevier Ltd. All rights reserved.
机译：利用详细的动力学机制对火焰进行数值模拟是计算上的难题。因此，已经开发出化学动力学还原的减少的机理和技术，并将其用于研究和工业应用中。本工作的目的是将层流非预混火焰的数值模拟中的整体动力学机理的预测与火焰小管生成歧管（FGM）降低技术与详细机理进行比较。燃料是一种类似沼气的混合物，其模型为用二氧化碳稀释的甲烷。首先，在一维逆流火焰中研究了向燃料流中添加二氧化碳的影响。研究了不同水平的二氧化碳的火焰结构和化学动力学。根据化学计量混合物中的CO2含量，引入了一种评估稀释效果的新方法。有了这个定义，纯稀释液对主要种类和温度峰值的影响往往是线性的。使用详细的，骨架的和四步全局机制针对不同的应变速率和稀释水平获得的溶液之间的比较揭示了这些化学动力学方法对沼气火焰建模的能力。然后，将四步机理和FGM技术与二维同流火焰中的骨架动力学模型进行了比较。观察到，对于温度和主要化学物质，四步机理表现出良好的结果，当需要这些字段时，这是一个很好的选择。另一方面，FGM技术提供了更好的定量结果，其优点是可以以较少的计算时间提供有关火焰成分的详细信息。对于FGM技术，研究并详细讨论了不同进度变量定义在复制CO2稀释火焰的组成空间中的能力。还针对二维结果讨论了将CO2添加到燃料流中的化学和纯稀释作用。 （C）2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Fuel》 |2017年第1期|671-685|共15页
  • 作者

    Hoerlle C. A.; Zimmer L.; Pereira F. M.;

  • 作者单位

    Univ Fed Rio Grande do Sul, Dept Mech Engn, Rua Sarmento Leite 425, BR-90050170 Porto Alegre, RS, Brazil;

    Ryerson Univ, Dept Mech & Ind Engn, 350 Victoria St, Toronto, ON M5B 2K3, Canada;

    Univ Fed Rio Grande do Sul, Dept Mech Engn, Rua Sarmento Leite 425, BR-90050170 Porto Alegre, RS, Brazil;

  • 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

    Biogas; CH4-CO2 mixtures; Global kinetic mechanism; Flamelet-Generated Manifold; Laminar non-premixed flame;

    机译：沼气;CH4-CO2混合气体;整体动力学机理;Flamelet产生的歧管;层流非预混火焰;

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