F104 Flame Behavior and Stability Limit on Radial Horizontal Jet Premixed Flame of Low Calorie Biomass Gas

The flame stability limits essentially define the fundamental operation of the combustion system. They are highly dependent on flow configurations and some species of biomass fuels. Recently, the stability mechanism of the methane-air premixed flame for flame holding has been studied, comparing with the diffusion flame. In this study, the transition behavior from the stable flame to lifting and blow-off is observed experimentally. When the fuel flow rate is constant, the premixed flame become short and quickly burn out with increasing the ratio of the air on methane-air premixed flame. Comparing the stability of horizontal premixed flame with vertical premixed flame, the vertical flame is more stabilized when the equivalent ratio is low. On the contrary the horizontal flame is more stabilized when the equivalent ratio is more than about 6〜8.