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SCALAR DISSIPATION RATE MODELING AND ITS VALIDATION

机译:标量耗散率建模及其验证

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A simple algebraic model for the Favre averaged scalar dissipation rate, ε_e, in high Damkohler number premixed flames is obtained from its transport equation by balancing the leading order terms. Recently proposed models for the dominant terms in the transport equation are revisited and revised. The algebraic model incorporates essential physics of turbulent premixed flames, namely, dilatation rate, its influence on turbulence-scalar interaction, chemical reactions, and dissipation processes. A realizability analysis is carried out to show that the algebraic model is always unconditionally realizable. The model predictions of dissipation rate are compared with the DNS results, and the agreement is good over a range of flame conditions. Application of the Kolmogorov-Petrovski-Piskunov (KPP) theorem along with the above algebraic model gives an expression for the turbulent flame speed. Its prediction compares well with a range of experimental data with no modifications to the model constants.
机译:通过平衡前导项,从其传输方程中获得了一个高Damkohler数预混火焰中Favre平均标量耗散率ε_e的简单代数模型。对最近提出的输运方程中占主导地位的模型进行了重新讨论。代数模型包含了湍流预混火焰的基本物理原理,即膨胀率,其对湍流-标量相互作用,化学反应和耗散过程的影响。进行可实现性分析以表明代数模型始终是无条件可实现的。将耗散率的模型预测值与DNS结果进行比较,在一系列火焰条件下,一致性很好。 Kolmogorov-Petrovski-Piskunov(KPP)定理的应用以及上述代数模型给出了湍流火焰速度的表达式。它的预测可以与一系列实验数据很好地比较,而无需修改模型常数。

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