Large Eddy Simulation of Turbulent Premixed Combustion at Moderate Damköhler Numbers Stabilized in a High-Speed Flow

Abstract

Premixed turbulent combustion modeling in situations where the thin flame hypothesis does not hold has been a continuous challenge over the past decades. The present work is devoted to the analysis of a turbulent premixed flame in such a combustion regime, where a strong interaction exists between turbulence and chemical reaction. The authors used a large-eddy simulation (LES) technique combined with a transported probability density function (PDF) description. A discussion of the computed structure of the reactive flow field is presented. Then, the obtained results are compared to available measurements in terms of averaged and fluctuating velocity fields, and temperature PDF. The obtained results evidence the capability of the computational model to predict the increase of turbulence levels by the flame as well as temperature PDF shapes that characterize the turbulent flame structure. Finally, some directions for further developments are delineated.