Large Eddy Simulations of a turbulent premixed swirl flame using an algebraic scalar dissipation rate closure
Large Eddy Simulations of a turbulent premixed swirl flame using an algebraic scalar dissipation rate closure
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DOI：
10.1016/j.combustflame.2015.05.003
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发表时间：
2015-09
影响因子：
4.4
通讯作者：
D. Butz;Yuan Gao;A. Kempf;N. Chakraborty
中科院分区：
文献类型：
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作者：
D. Butz;Yuan Gao;A. Kempf;N. Chakraborty
通过求解Favre过滤反应进程变量和混合物分数的输运方程，对著名的TECFLAM燃烧器配置中的涡流稳定湍流预混火焰进行了大涡模拟（LES）。最近提出的标量耗散率（SDR）的封闭用于反应进度变量的过滤反应速率的建模，而Favre过滤的混合物分数用于考虑混合物分层由于夹带。计算结果被用来分析在旋流火焰中的代表性位置的分层的性质，以获得物理洞察火焰结构。此外，两个代数火焰表面密度（FSD）封闭，这被发现表现良好，在以前的分析（马等人，2013），用于对反应进程变量的过滤反应速率进行建模。SDR封闭的预测相比，从代数FSD封闭得到相应的结果。SDR为基础的模拟的预测显示出相当好的协议与实验结果的准确性水平至少是可比的代数FSD模型和文献中报道的结果。
Large Eddy Simulations (LES) of a swirl-stabilised turbulent premixed flame in the well-known TECFLAM burner configuration have been carried out by solving transport equations of Favre-filtered reaction progress variable and mixture fraction. A recently proposed closure for the Scalar Dissipation Rate (SDR) is used for the modelling of the filtered reaction rate of reaction progress variable, whereas the Favre filtered mixture fraction is used to account for mixture stratification due to entrainment. The computational results are utilised to analyse the nature of stratification at representative locations in the swirl flame to gain physical insight into the flame structure. Additionally, two algebraic Flame Surface Density (FSD) closures, which were found to perform well in a previous analysis (Ma et al., 2013), are used for the modelling of the filtered reaction rate of reaction progress variable. The predictions of SDR closure are compared to the corresponding results obtained from algebraic FSD closures. The predictions of SDR based simulations show reasonably good agreement with experimental findings; the level of accuracy is at least comparable to that achieved with algebraic FSD models and to the results reported in the literature.