A215 Direct Numerical Simulation of Methane-Air Turbulent Jet Premixed Flame

Abstract

Direct numerical simulation (DNS) of methane-air turbulent jet premixed flame has been conducted to clarify characteristics of local burning velocity. A detail kinetic mechanism including 49 reactive species and 279 elementary reactions is used to represent the methane-air reaction. In this study, we investigate effects of definition of flame front and fluid velocity on local burning velocity. The calculated displacement speed at flame front is strongly affected by the definition of fluid velocity. It is difficult to describe dynamic characteristics of turbulent premixed flame in strong turbulence by the flamelet concept.