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Assessing the Effect of Differential Diffusion for Stratified Lean Premixed Turbulent Flames with the Use of LES-PDF Framework

机译：使用LES-PDF框架评估微分扩散对分层稀薄预混湍流火焰的影响

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Lean premixed stratified combustion is rapidly growing in importance for modern engine designs. This paper presents large eddy simulations for a new burner design to assess the predictive capability of the probability density function (pdf) approach to flames that propagate through non-homogeneous mixtures in terms of equivalence ratio. Although various efforts have been made in the past for the simulation of the same test case the novelty of this work lies to the fact that it is the first simulation effort that differential diffusion is accounted for given the relatively low Reynolds numbers (13,800) of the configuration. First mean and root mean square velocity simulations are performed for the isothermal cases to assess the effect of the grid resolution and the overall LES flow field solver. Then instantaneous snapshots of the flame are presented to provide insight to the structure of the flame and the effect of stratification. Finally, results for velocities, temperature and mixture fraction are presented and compared with the experimental data. Overall, the results are in very good agreement with experiments.
机译：稀薄的预混合分层燃烧在现代发动机设计中的重要性正在迅速提高。本文介绍了一种新的燃烧器设计的大型涡流模拟，以评估当量比时，通过非均匀混合物传播的火焰的概率密度函数（pdf）的预测能力。尽管过去已经为模拟相同的测试用例做出了各种努力，但这项工作的新颖之处在于，鉴于雷诺数相对较低（13,800），这是第一次模拟差分扩散。组态。对等温情况进行了第一均方根速度和均方根速度模拟，以评估网格分辨率和整个LES流场求解器的影响。然后呈现火焰的瞬时快照，以提供对火焰结构和分层效果的了解。最后，给出了速度，温度和混合比的结果，并与实验数据进行了比较。总体而言，结果与实验非常吻合。

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