On the interaction between turbulence and ethanol spray combustion using a dynamic wrinkling model coupled with tabulated chemistry

Abstract

Investigations of the turbulence-flame interaction are conducted for ethanol spray combustion with dynamic flame surface wrinkling (DFSW) models in the context of the Artificially Thickened Flame (ATF) approach. DFSW modeling strategies derived for single-phase flows are extended to improve the characterization of the mixture stratification encountered in dilute spray flames. The two-phase flow is described following an Eulerian–Lagrangian approach within the Large Eddy Simulation (LES) framework under consideration of two-way coupling between both gaseous and liquid phases. In particular, combustion reactions are captured by means of the Flamelet Generated Manifold (FGM) method. An evaporation model accounting for the inter-phase non-equilibrium is applied to address droplet’s heat and mass transfer. Main aspects of the suggested DFSW modeling strategy are systematically analyzed. The obtained results demonstrate fair improvements not only in the estimation of the flame structure, but also in the prediction of the spray properties in comparison to a reference model and the available experimental data. This outcome reveals the strong link between turbulence, flame and dispersed phase, as well as the necessity of a suitable computation of each one of these phenomena.