Flame-vortex interactions in lean methane-air mixtures

摘要

In this work, results from two-dimensional simulations to investigate the influence of counter-rotating vortex pairs on flames propagating from high temperature ignition kernels in lean mixtures and planar lean methane-air flames. It is observed that the flame development is accelerated by interactions with the vortices and the net heat release rate increases with increase in the product of length and velocity scales, i.e. a "turbulent diffusivity". The length and velocity scales, however, are shown to have independent effects on the heat release rate. Implications for modeling turbulent flame propagation will be discussed.