Two-Dimensional Diffusion Flame Burner with a Mixing-Roll

抄録

A burner with a mixing-roll at an end of partition wall between fuel gas and air supplying nozzle was used. The fuel gas was flowing along the side wall of the burner, and air was supplied together with the fuel gas. The fuel gas was diffused in the air quickly by the existence of the mixing-roll. A diffusion flame in this burner was stabilized on a wake of the roll. The burning mechanism in this burner was clarified. The flame had different shapes which were stabilized under each fixed flow situation. The fuel gases were sucked into the air flow as soon as they flowed out of the fuel nozzle, and reacted soon, in the case of a turbulent flame. A turbulence intensity of the flow was increased by the existence of flame, so that eddy diffusions acted much more rapidly than in the flow that is under the same conditions but without a flame. The diffusion velocity could be made so high by the mixing-roll that the burning rate of this burner was determined by the burning velocity of fuel-air mixture only under certain conditions.