SCALAR DISSIPATION RATE MODELING AND ITS VALIDATION
SCALAR DISSIPATION RATE MODELING AND ITS VALIDATION
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DOI：
10.1080/00102200802612419
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发表时间：
2009-01-01
影响因子：
1.9
通讯作者：
Swaminathan, N.
中科院分区：
文献类型：
--
作者：
Kolla, H.;Rogerson, J. W.;Swaminathan, N.
本文从高Damkohler数预混火焰的输运方程出发，通过平衡首阶项，得到了高Damkohler数预混火焰中Favre平均标量耗散率（α）/（c）的简单代数模型。最近提出的模型中的主要条款的传输方程进行了重新审视和修订。代数模型结合了湍流预混火焰的基本物理，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。可实现性分析表明，代数模型总是无条件可实现的。耗散率的模型预测与DNS的结果进行了比较，协议是良好的火焰条件的范围内。应用Kolmogorov-Petrovski-Piskunov（KPP）定理沿着上述代数模型给出了湍流火焰速度的表达式。它的预测比较以及与一系列的实验数据，没有修改的模型常数。
A simple algebraic model for the Favre averaged scalar dissipation rate, (epsilon) over tilde (c), 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.