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Modelling of turbulent scalar flux in turbulent premixed flames based on DNS databases

机译：基于DNS数据库的湍流预混火焰中湍流标量通量建模

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A transport equation for scalar flux in turbulent premixed flames was modelled on the basis of DNS databases. Fully developed turbulent premixed flames were obtained for three different density ratios of flames with a single-step irreversible reaction, while the turbulent intensity was comparable to the laminar burning velocity. These DNS databases showed that the countergradient diffusion was dominant in the flame region. Analyses of the Favre-averagged transport equation for turbulent scalar flux proved that the pressure related terms and the velocity-reaction rate correlation term played important roles on the countergradient diffusion, while the mean velocity gradient term. the mean progress variable gradient term and dissipation terms suppressed it. Based on these analyses. modelling of the combustion-related terms was discussed. The mean pressure gradient term and the fluctuating pressure term were modelled by scaling, and these models were in good agreement with DNS databases. The dissipation terms and the velocity-reaction rate correlation term were also modelled. and these models mimicked DNS well.
机译：在DNS数据库的基础上，建立了湍流预混火焰中标量通量的输运方程。对于三种不同密度比的火焰，通过一步不可逆反应获得了完全发展的湍流预混火焰，而湍流强度与层流燃烧速度相当。这些DNS数据库显示，逆梯度扩散在火焰区域占主导地位。湍流标量通量的Favre平均输运方程分析表明，压力相关项和速度反应速率相关项在反梯度扩散中起重要作用，而平均速度梯度项则起重要作用。平均进度变量梯度项和耗散项抑制了它。基于这些分析。讨论了与燃烧有关的术语的建模。通过缩放对平均压力梯度项和脉动压力项建模，这些模型与DNS数据库非常吻合。还对耗散项和速度反应速率相关项进行了建模。这些模型很好地模仿了DNS。

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