Influence of the Damköhler number on turbulence-scalar interaction in premixed flames. II. Model development
Influence of the Damköhler number on turbulence-scalar interaction in premixed flames. II. Model development
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DOI：
10.1063/1.2714076
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发表时间：
2007-04
影响因子：
4.6
通讯作者：
N. Chakraborty;N. Swaminathan
中科院分区：
文献类型：
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作者：
N. Chakraborty;N. Swaminathan
使用通过直接数值模拟 (DNS) 计算的两个自由传播的统计平面火焰，研究了 Damkohler 数 Da 对预混合火焰中湍流和标量场相互作用的影响的建模。 Da>1 的一种火焰显示出波纹小火焰状态中的湍流燃烧的属性，而另一种具有Da 1 火焰，而它在Da<1 火焰中产生标量梯度。有人争论并表明，为了正确地表示上述物理现象，达姆科勒数依赖性应该明确出现在湍流-标量相互作用的模型中。雷诺平均纳维斯托克斯 (RANS) 框架中的简单统一模型，涉及局部 Damkohler 数的交互过程取决于...
The modeling of Damkohler number, Da, effects on the interaction of turbulence and scalar fields in premixed flames is studied using two freely propagating statistically planar flames calculated by direct numerical simulation (DNS). One flame having Da>1 shows attributes of turbulent combustion in the corrugated flamelets regime while the other having Da 1 flame whereas it produces the scalar gradients in the Da<1 flame. It is argued and also shown that the Damkohler number dependence should explicitly appear in the models for the turbulence-scalar interaction in order to represent the above physics correctly. Simple unified models, in the Reynolds averaged Navier-Stokes (RANS) framework, for the interaction processes involving a local Damkohler number depend...