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在二阶矩亚网格燃烧模型的基础上,考虑了密度脉动,提出了动态亚网格二阶矩燃烧模型(Dynamic-LES-SOM)。在此模型中,反应项由平均反应项和亚尺度反应项组成,所有的系数都是通过动态计算得到。使用该模型对美国Sandia国家实验室Flame C进行了计算,并且与忽略密度脉动的二阶矩亚网格燃烧模型结果进行对比。结果发现,DynamicLES-SOM燃烧模型计算结果与实验值吻合得很好,较忽略密度脉动的二阶矩燃烧模型有所提高。
On the basis of the second-moment sub-grid combustion model, the dynamic sub-grid second-order moment combustion model (Dynamic-LES-SOM) is proposed considering the density pulsation. In this model, the reaction term consists of the average reaction term and the sub-scale reaction term, and all the coefficients are calculated dynamically. The model was used to calculate the Flame C of Sandia National Laboratory in the USA and compared with the results of the second-order sub-lattice combustion model ignoring the density pulsation. The results show that the calculated results of the DynamicLES-SOM combustion model are in good agreement with the experimental ones, and the second-order moment combustion model, which ignores the density pulsation, is improved.