Large Eddy Simulation of a Methane–Air Diffusion Flame
Large Eddy Simulation of a Methane–Air Diffusion Flame
复制标题
甲烷-空气扩散火焰的大涡模拟
DOI：
10.1007/s10494-008-9143-5
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
W. Jones
中科院分区：
文献类型：
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作者：
D. Clayton;W. Jones
大涡模拟已被应用到一个试点的甲烷/空气扩散火焰-桑迪亚D火焰-详细的实验数据。为了评估反应的密度，温度和物种的质量分数保守的标量层流小火焰制定，利用一个单一的几乎无应变的小火焰。两个模拟的结果进行了讨论，比较使用的标准Smagorinsky模型和一个动态的变量封闭的未知的子网格应力。所选择的亚网格尺度模型被证明是非常有影响力的最终解决方案。虽然使用标准模型的结果在一个相对较差的模拟，动态关闭提供了一个很好的速度场预测整个火焰。虽然火焰确实显示出一些应变率的影响燃烧，特别是接近进口喷嘴，相对简单的“无应变”小火焰模型应用示出提供了一个准确的表示温度和主要物种分布。
Large Eddy Simulation has been applied to a piloted methane/air diffusion flame—the Sandia D flame—for which detailed experimental data are available. To evaluate the reacting density, temperature and species mass fractions a conserved scalar laminar flamelet formulation is employed, utilising a single virtually unstrained flamelet. The results of two simulations are discussed, comparing the use of the standard Smagorinsky model and a dynamic variant for closure of the unknown sub-grid stress. The chosen sub-grid scale model is shown to be extremely influential on the final solution. Whilst the use of the standard model results in a relatively poor simulation the dynamic closure offers an excellent velocity field prediction throughout the flame. Although the flame does show some strain rate influence on burning, particularly close to the inlet nozzle, the relatively simple ‘unstrained’ flamelet model applied is shown to provide an accurate representation of temperature and major species distribution.