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首页> 外文期刊>Combustion and Flame >Effects of radiation and compression on propagating spherical flames of methane/air mixtures near the lean flammability limit
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Effects of radiation and compression on propagating spherical flames of methane/air mixtures near the lean flammability limit

机译：辐射和压缩对稀薄燃烧极限附近甲烷/空气混合物传播的球形火焰的影响

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摘要

Large discrepancies between the laminar flame speeds and Markstein lengths measured in experiments and those predicted by simulations for ultra-lean methane/air mixtures bring a great concern for kinetic mechanism validation. In order to quantitatively explain these discrepancies, a computational study is performed for propagating spherical flames of lean methane/air mixtures in different spherical chambers using different radiation models. The emphasis is focused on the effects of radiation and compression. It is found that the spherical flame propagation speed is greatly reduced by the coupling between thermal effect (change of flame temperature or unburned gas temperature) and flow effect (inward flow of burned gas) induced by radiation and/or compression. As a result, for methane/air mixtures near the lean flammability limit, the radiation and compression cause large amounts of under-prediction of the laminar flame speeds and Markstein lengths extracted from propagating spherical flames. Since radiation and compression both exist in the experiments on ultra-lean methane/air mixtures reported in the literature, the measured laminar flame speeds and Markstein lengths are much lower than results from simulation and thus cannot be used for kinetic mechanism validation.
机译：在实验中测得的层流火焰速度和Markstein长度之间的较大差异，以及通过超薄甲烷/空气混合物的模拟预测得出的差异，极大地引起了动力学机理的验证。为了定量解释这些差异，进行了计算研究，以使用不同的辐射模型在不同球形腔室内传播贫甲烷/空气混合物的球形火焰。重点集中在辐射和压缩的影响上。发现通过辐射和/或压缩引起的热效应（火焰温度或未燃烧气体温度的变化）与流动效应（燃烧气体的内流）之间的耦合大大降低了球形火焰的传播速度。结果，对于接近贫燃极限的甲烷/空气混合物，辐射和压缩会导致对层流火焰速度和从传播的球形火焰中提取的马克斯坦长度的大量预测不足。由于在文献中报道的超稀甲烷/空气混合物的实验中都存在辐射和压缩，因此测得的层流火焰速度和Markstein长度远低于模拟结果，因此不能用于动力学机理验证。

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  • 来源
    《Combustion and Flame》 |2010年第12期|p.2267-2276|共10页
  • 作者

    Zheng Chen;

  • 作者单位

    State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Aerospace Engineering, College of Engineering, Peking University, Beijing 100871, China;

  • 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 flame speed; markstein length; propagating spherical flame; radiation; compression;

    机译：层流火焰速度马克斯坦长度;传播的球形火焰辐射;压缩;

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