Experimental Study of a Novel Miniature-burner Prototype with a Low Heat Loss

An experimental study has been conducted of a new method for reducing the heat loss of a miniature burner,the working principle of which lies in its preheating of unburned gas mixture by admitting gas uniformly through porous wall surfaces and in the meanwhile by reducing the temperature of the wall surfaces,thus effectively lowering the heat loss of the burner.The experimental results show that the adoption of a combined gas admission mode of supplying the burner with fuel-rich gas mixture in a circumferential direction and air from the central portion of end wall surfaces can contribute to the formation of a stable tubular premixed flame inside the miniature burner,the flame assuming a blue color and burning steadily.When the flame temperature reaches a level higher than 1100 ℃,the burner inner wall temperature will be lower than 500 ℃,while the burner outer wall temperature will be around 150 ℃ and the heat loss from side walls of the burner,approximately 6%,thus significantly enhancing the flame stability of the burner.