Abstract
Three-dimensional direct numerical simulation (DNS) of methane-air turbulent premixed flame with a realistic reduced kinetic mechanism has conducted to investigate effects of turbulence characteristics on the local heat release rate. Numerical condition of the DNS is classified into thin reaction zones of combustion diagram proposed by Peters. Quite low heat release rate regions corresponding to the local extinction are observed. In the vicinities of these regions, flame elements are strongly stretching into two tangential directions. The local extinction mechanism was clarified by introducing life time of reactive species relative to strong coherent fine scale eddies in turbulence.
