High EGR Rate, Lean TRF-air Turbulent Flame with Tumble Flow

Abstract

To investigate the flame propagation characteristics under a high efficiency spark ignition engine condition, a direct numerical simulation (DNS) of forced ignition of premixed mixtures in a constant volume vessel with a tumble flow has been performed for a lean Toluene Reference Fuel (TRF)-air mixture at a high exhaust gas recirculation (EGR) rate at high pressure. Main flame just after the ignition point shows flamelet-like structure, whereas flames that was split by turbulent motion seem to be in extinction process.