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首页> 外文期刊>Combustion Science and Technology >Statistical Behavior of Scalar Dissipation Rate in Head-On Quenching of Turbulent Premixed Flames: A Direct Numerical Simulation Analysis
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Statistical Behavior of Scalar Dissipation Rate in Head-On Quenching of Turbulent Premixed Flames: A Direct Numerical Simulation Analysis

机译：湍流预混火焰正面淬火中标量耗散率的统计行为：直接数值模拟分析

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The statistical behavior of the scalar dissipation rate (SDR) and its transport in the context of Reynolds averaged Navier Stokes (RANS) simulations has been analyzed for head-on quenching of turbulent premixed flames using a three-dimensional simplified chemistry based direct numerical simulations (DNS) database. The flame quenching statistics have been analyzed in terms of wall Peclet number Pe (i.e., non-dimensional distance of the flame in the wall normal direction) and non-dimensional wall heat flux magnitude phi. It has been found that flame wrinkling induces fluctuations of wall heat flux in turbulent cases and the magnitude of the maximum wall heat flux increases with increasing root-mean-square turbulent velocity u'. The closure of mean reaction rate using the SDR of reaction progress variable in the near wall region has been assessed based on a priori analysis of DNS data. It has been demonstrated that the existing SDR-based reaction rate closure does not work satisfactorily near the wall. A modification to this existing closure has been proposed, which is found to satisfactorily predict the mean reaction rate of reaction progress variable (omega) over bar in the near wall region and approaches the existing closure away from the wall. The wall effects on the unclosed terms of the SDR transport equation have been analyzed and the order of magnitude estimates of the leading order contributors to the SDR transport have been utilized to modify an existing algebraic SDR closure to account for the near wall effects. A priori DNS analysis suggests that the proposed modification to the aforementioned SDR closure provides satisfactory prediction both away from and near to the wall.
机译：使用基于三维简化化学方法的直接数值模拟，分析了雷诺平均Navier Stokes（RANS）模拟中标量耗散率（SDR）及其传输的统计行为，以进行湍流预混火焰的正面淬火（ DNS）数据库。火焰淬火统计数据是根据壁Peclet数Pe（即，火焰在壁法向方向上的无量纲距离）和无量纲的壁热通量phi进行分析的。已经发现，在湍流情况下，火焰起皱会引起壁热通量的波动，并且最大壁热通量的大小随着均方根湍流速度u'的增加而增加。基于DNS数据的先验分析，已经评估了使用近壁区域中反应进程变量的SDR关闭平均反应速率的方法。已经证明，现有的基于SDR的反应速率封闭在壁附近不能令人满意地工作。已经提出了对该现有封闭件的修改，发现该修改件令人满意地预测了在近壁区域中棒上的反应进度变量（ω）的平均反应速率，并且远离壁接近现有封闭件。已经分析了对SDR传输方程的未封闭项的壁效应，并且利用SDR传输的前导贡献者的数量级估计来修改现有的代数SDR闭合以解决近壁效应。先前的DNS分析表明，对上述SDR封闭的建议修改可在远离和靠近墙壁的位置提供令人满意的预测。

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