Effect of restricted domain and premixed gas initial temperature on the flame blow-out performance of surface flame on porous media surface

To optimize a micro combustor based on porous media dome, the influences of the restricted domain and initial temperature of premixed gas on the blow-out performance of surface flame on porous media surface were investigated experimentally. The premixed gas of methane and air was experimental subject. The results show that with the quartz glass restricted domain, surface flame on porous media surface can only be maintained when the speed of the premixed gas is low (0.188-0.436 m/s). It is easier to be blown out when the speed of premixed gas is increasing. However, restricted domains with different lengths produce no differences. When the premixed gas initial temperature increases from 293 K to 550 K, the blow-out velocity of surface flame on porous media surface becomes higher. When the equivalence ratio equals 1.0, the blow-out velocity of initial premixed gas increased from 1.176 m/s (293 K) to 2.678 m/s (550 K). There are two rising processes with different slopes. In this condition, initial temperature of premixed gas doesn't yield essentially impact on the blow-out performance.