Large Eddy Simulation of Methane Diffusion Flame: Comparison of Chemical Kinetics Mechanisms
Large Eddy Simulation of Methane Diffusion Flame: Comparison of Chemical Kinetics Mechanisms
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DOI：
10.1063/1.3498395
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发表时间：
2010-09
期刊：
影响因子：
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通讯作者：
Bjo;R. Lilleberg;B. Panjwani;I. S. Ertesvåg
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文献类型：
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作者：
Bjo;R. Lilleberg;B. Panjwani;I. S. Ertesvåg
对 Sandia Flame D 甲烷扩散火焰进行了大涡模拟 (LES)。涡耗散概念 (EDC) 模型的扩展 LES 版本用作湍流燃烧闭合模型。在 LES 中，由于精细的网格分辨率和控制方程的不稳定性质，计算成本很高。在带有 EDC 的 LES 中使用详细的化学机制过于昂贵，因此，为了减少计算成本，优选减少机制。在这项研究中，使用两种还原甲烷机制和一种详细甲烷机制对甲烷空气燃烧进行了一系列 PSR 计算。简化的机制往往会严重高估贫混合气区或富混合气区的温度和主要物质质量分数。两种机制都会高估稀混合物的温度。还使用桑迪亚火焰 D 的 LES 研究了两种还原甲烷机制。将两种还原机制的结果与快速化学方法进行了比较，结果如下：
Large Eddy Simulations (LES) of the Sandia Flame D methane diffusion flame are carried out. An extended LES version of the Eddy Dissipation Concept (EDC) model is used as a turbulence combustion closure model. In LES the computational cost is high due to the fine grid resolution and unsteady nature of the governing equations. Using a detailed chemical mechanism in LES with EDC is too expensive, and hence, to reduce computational cost reduced mechanisms are preferred. In this study a number of PSR calculations for methane‐air combustion using two reduced methane mechanisms and one detailed methane mechanism are carried out. The reduced mechanisms tend to strongly overpredict the temperature and major species mass fraction in either the lean or the rich mixture zone. Both mechanisms overpredict temperature for lean mixtures. The two reduced methane mechanisms are also studied with LES for the Sandia Flame D. The results of the two reduced mechanisms are compared with the fast chemistry approach and it is ob...