Burner rim geometry effect on flame stability

We studied a swirl burner in atmospheric pressure combustion system with different burner lengths to burner rim diameter ratios (L/D). Three ratios, of L/D 1, 2 and 3, were used to investigate the effect of the burner's geometry on the stability window. The results show that the position of the flame front stabilization changes with L/D ratio. The flame front stabilizes closer to the burner rim as the length of the burner is increased. The equivalence ratio of the mixture was taken as constant for the comparison's sake. The flame stabilizes closer to the rim with an increase of the rim length.