障碍物对火焰结构影响的Realizable k-ε模型数值模拟

Realizable k-ε Model Simulation on the Structure of Flame Induced by an Obstacle

在管道内设置长方体障碍物,对火焰翻越障碍物的情形进行数值模拟研究,分析火焰褶皱现象。基于可实现k-ε模型(Realizable k-εmodel)和EDC(涡流耗散概念模型),建立湍流加速火焰现象的数值模型,实现管道火焰流场的可视化,研究障碍物对火焰结构、火焰流场的加速过程,分析了导致火焰发生褶皱的机理,得出火焰在翻越障碍物后会形成两个相反方向的涡流。

The numerical investigations on the propagation of the flame through an obstacle are performed in a pipeline with a rectangular obstacle to analyze the fold phenomenon. Based on realizable k-ε model and EDC model, the mathematical model of flame acceleration by turbulence is established to realize the visualization of flame flow. Two opposite direction vortex rings can be obtained by studying the speeding process of obstacles to flame structure and flow field and the mechanism of flame wrinkle.