Assessment of the Evolution Equation Modelling approach for three-dimensional expanding wrinkled premixed flames

摘要

Direct Numerical Simulations (DNS), Evolution Equation Modelling (EEM) and Experimental results from the literature (EXP) are presented and analyzed for an expanding propane/air flame. DNS results are obtained thanks to the in-house finite-difference code HAllegro. Computed (DNS/EEM) and measured (EXP) equivalent radii RP and Rs, mean stretch k and consumption velocity Sc, as well as sample front shapes, are compared using the same post-processing procedure. Small perturbations in the EEM input parameters induce comparatively small shifts in the compared results, showing the robustness of the approach. When slightly adapting only one 0(1) parameter for the EEM strategy (the effective turbulent forcing amplitude felt by the flame), DNS, EEM and EXP show quite fair agreement one another, except for one of the experiments at early times. In the context of expanding flames, this validated EEM methodology can constitute a reliable tool to compute realistically large sized flames.