G061056 Effects of Equivalence Ratio on Flame Surface Density of Spherically Propagating Premixed Flame

Abstract

Flame front area of turbulent flame is considered to be dominant to turbulent burning velocity. Flame surface density is an important parameter taken into consideration in some turbulent combustion models. Most of previous studies regarding flame surface density were based on burner flames or numerical investigations. Only a few studies have been carried out on this parameter of spherically propagation flames. In this study, flame surface density of spherically propagating flame was examined. The cross-sectional images of spherically propagating flame were obtained by Mie scattered laser tomograph technique. Burning velocities and configuration of the flames were investigated for iso-octane/air mixtures at equivalence ratio of 0.8,1.0, 1.4. The ratio of turbulent burning velocity increased with the increase in equivalence ratio. The perimeter of the cross-sectional images of the flame increased with equivalence ratio. However, the flame surface density did not vary with equivalence ratio.