PROPAGATION AND FRACTALS OF TURBULENT JET FLAMES

Propagation of turbulent jet flames under various flow conditions was characterized using a thin-filament pyrometry technique. The flame-propagation data were analyzed by fractal analysis to predict the turbulent flame velocity, and the results were compared with measured velocity values. The fractal dimensions for jet flames under numerous flow conditions and at various locations were found to have a mean value of 1.312 and a root-mean-square value of 0.071. The difference between the predicted and measured velocities ranged from 0 to 25%. The changing fractal characteristics of the flame with respect to downstream locations indicated that the jet flow was dominant over the flame near the stabilized flame base. Further downstream, the heat release of the flame became significant and reduced the fractal dimension of the flame.