Direct numerical simulation of a turbulent lifted flame: stabilisation mechanism

Abstract

A turbulent lifted slot-jet flame is studied using direct numerical simulation (DNS). A single step chemistry model is employed with a mixture-fraction dependent activation energy to quantitatively reproduce the dependence of laminar burning rate on equivalence ratio that is typical of hydrocarbon fuels. It is observed that the leading flame edge exhibits a single branch close to the stoichiometric mixture fraction iso-surface, rather than a tribrachial structure. The flame edge has a complex, highly convoluted structure suggesting it can burn at speeds that are much faster than S L . There is no evidence of a rich inner premixed flame or detached diffusion flame islands, in contrast with th..