Large-Eddy Simulation of the Sydney Swirling NonPremixed Flame and Validation of Several Subgrid-Scale Models
Large-Eddy Simulation of the Sydney Swirling NonPremixed Flame and Validation of Several Subgrid-Scale Models
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DOI：
10.1080/10407790701632477
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发表时间：
2008-10
期刊：
影响因子：
--
通讯作者：
L. Hu;L. Zhou;Y. H. Luo
中科院分区：
文献类型：
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作者：
L. Hu;L. Zhou;Y. H. Luo
采用二阶矩（SOM）和简化PDF亚网格尺度（SGS）燃烧模型、Smagorinsky-Lilly和动态动能（DKE）亚网格尺度（SGS）应力模型，采用大涡模拟（LES）对甲烷-空气旋转扩散火焰进行了研究。实验数据验证了预测的正确性。对于LES统计，将预测的轴向和切向时均和均方根（RMS）波动速度、温度、均方根波动温度、CO2和H2O质量分数与实验结果进行比较，结果表明，本文采用的所有SGS模型的结果相差不大，但DKE + SOM模型略好于其他SGS模型。对于瞬时结果，预测的带有颈部区域的火焰形状与实验结果一致。使用DKE + SOM模型预测的火焰形状和长度优于其他SGS模型。旋转火焰中既有大尺度结构，也有小尺度结构；燃烧减少了大尺度结构，增强了小尺度结构。
A methane–air swirling diffusion flame is studied by large-eddy simulation (LES) using second-order moment (SOM) and simplified PDF subgrid-scale (SGS) combustion models, Smagorinsky-Lilly and dynamic kinetic energy (DKE) subgrid-scale (SGS) stress models. The predictions are validated by the experimental data. For LES statistics, comparison of the predicted axial and tangential time-averaged and root-mean-square (RMS) fluctuation velocities, temperature, RMS fluctuation temperature, CO2 and H2O mass fractions with the experimental results shows that all of the SGS models adopted here give results with only slight differences, but the DKE + SOM models are somewhat better than other SGS models. For instantaneous results, the predicted flame shape with a neck region is in agreement with that observed in experiments. The predicted flame shape and length obtained using the DKE + SOM models are better than those obtained using other SGS models. There are both large-scale and small-scale structures in the swirling flame; combustion reduces the large-scale structures and enhances the small-scale structures.