Dynamics of Ignition and Extinction Fronts on Diffusion Flame Sheets

这是一个研究的传播的点火和熄灭前锋（边缘火焰）的扩散火焰片使用的分析方法和数值模拟相结合。 先前阐述的抛物线火焰路径假设（PFPA）和它的纳入激活能渐近框架的范围和效用进行了测试。 系统检查包括灭绝前，碰撞三重火焰，和圆形点火前。 这项工作的影响，描述了一个成员的重要的实际现象，包括起飞和吹出的射流火焰，在柴油发动机中的自燃，火焰蔓延的燃料床，并在湍流非预混燃烧的局部熄灭。

This is a study of the propagation of ignition and extinction fronts (edge flames) on diffusion-flame sheets using a combination of analytical methods and numerical simulations. The scope and utility of the previously articulated parabolic flame path assumption (PFPA) and its incorporation into the activation-energy asymptotics framework are tested. Systems examined include extinction fronts, colliding triple flames, and circular ignition fronts. The work has implications for describing a member of important practical phenomena including lift-off and blow-out of jet flames, autoignition in diesel engines, flame spread over fuel beds, and local extinction in turbulent nonpremixed combustion.