采用考虑详细化学反应机理的火焰面模型模拟湍流扩散火焰

采用详细的甲烷氧化化学反应动力学机理(GRI-Mech3．0)对不同拉伸率条件下的拉伸层流扩散火焰面结构进行了数值计算，建立了一个包含一系列拉伸层流火焰面结构的火焰面数据库．将这些层流火焰面结构和美国Sandia国家实验室测得的湍流扩散火焰(FlameD)的平均火焰结构进行了对比，发现层流火焰面所覆盖的范围基本包含了所考虑的湍流火焰中不同位置的平均火焰结构，这表明火焰面模型是合理的．然后，采用火焰面模型对该湍流扩散火焰进行了数值模拟并和实验数据进行了比较，考察了火焰面模型的精确程度和模拟深度.

Flamelet Modeling of Turbulent Non-Premixed Flame Based on Detailed Chemical Reaction Mechanisms

The stretched laminar diffusion flamelet structures under different strain rates were numerically calculated based on a set of detailed chemical reaction mechanism GRI-Mech 3.0 for methane oxidation. From the calculation, flamelet library consisting of a series of stretched laminar flamelet structures is generated.These laminar flamelet structures were compared with the piloted turbulent diffusion flame (Flame D)of the mean turbulent flame structures of Sandia National Laboratory. It is found that the mean flame structures of the considered turbulent flame at different locations almost all fall into the area covered by the series of laminar flamelet structures, which indicates the validity of the flamelet model. Then, by using the flamelet model, numerical simulations of Flame D were performed and the modeling accuracy and depth of flamelet model are investigated.