Effect of porous media structure parameters on surface flame blow-out performance

To optimize a micro combustor with dome made of porous media, the influences of porous media structure parameters (equivalent aperture, porosity) on the surface flame blow-out performance were investigated experimentally under different premixed gas initial temperatures. Methane and air premixed gas was used as fuel in this experiment. The results show that both two sides of the porous media surface flame go out at the same time when equivalent aperture equals 120 μm. One side goes out firstly when equivalent aperture equals 80 μm. With the decrease of equivalent aperture or porosity, equivalent ratio equals 1.0, premixed gas initial temperature equals 300K, the blow-out velocity increases. When equivalent aperture equals 80 μm, and porosities equal 0.55, 0.50 and 0.45, the blow-out velocities of porous media surface flame turn out to be 1.11, 1.22 and 1.31 m/s, respectively. When porosity equals 0.50, and equivalent apertures equal 120, 80 μm, equivalent ratio equals 1.0, premixed gas initial temperature equals 300K, the blow-out velocities turn out to be 0.73 m/s and 1.22 m/s, respectively. The increase of premixed gas initial temperature has obvious influence on porous media with equivalent aperture of 120 μm or porosity of 0.45. When the premixed gas initial temperature increases from 300K to 500K, the blow-out velocities increase by 120% and 76%, respectively.