Pages 21-22
Direct numerical simulations of hydrogen-air turbulent premixed flames propagating in three-dimensional homogeneous isotropic turbulence are conducted to investigate effects of turbulence characteristics on the local flame structures. Calculations are conducted for the three cases : in the wrinkled flamelets, on the boarder of distributed reaction zones and well-stirred reactor regimes and in the well-stirred reactor regimes. The probability density functions of the curvature of flame fronts show the same distribution for all cases when it is normalized by the turbulence characteristics in the unburned side. The heat release rate increases linearly with the increase of the curvature and the increasing rates are nearly identical for all cases.
