Experiment of blow-out performance of premixed flame on porous media surface

Experimental investigation was conducted on the premixed flame on porous media surface used for micro combustor, and the flow field characteristics and blow-out performance of porous media under different pore sizes and porosities were obtained. The research results indicate that the boundary layers of the flow field at the exit of porous media become thinner compared with pipe flow; the width of mainstream region is increased by about 50%, and the maximum speed fluctuation amplitude in this region reaches 2.2 times of the former. When the porosity of porous media decreases with the constant pore size, or the pore size of porous media decreases with the constant porosity, the speed fluctuation amplitude of mainstream region decreases. This becomes more obvious under small pore size condition with the maximum speed fluctuation amplitude decreasing from 2.435 m/s to 1.099 m/s. The flow field at the exit and flame shape have great influence on the blow-out performance of premixed flame on porous media surface. With the decrease of pore size and porosity, the blow-out velocity increases under the same equivalence ratio. The influences of porous media parameters can nearly double the blow-out velocity.