Abstract
Direct numerical simulation (DNS) of a hydrogen-air turbulent premixed flame propagating in homogeneous isotropic turbulence was conducted to investigate the local flame structure and fractal characteristics in high Reynolds number turbulence. A detail kinetic mechanism including 12 reactive species and 27 elementary reactions was used to represent the hydrogen-air reaction. In high Reynolds number turbulence, very complicated flame structures induced by strong coherent fine scale eddy were generated and strong correlation between the inner cutoff and the ratio of diameter of coherent fine scale eddy to laminar flame thickness was observed.
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