Propagation of premixed combustion wave of methane/air in packed bed
Combustion wave propagation experiments in porous media were carried out for premixed methane/air mixtures with an equivalence ratio ranging from 0.7 to 1.0.Wave velocity,peak combustion temperature,and flame structure were studied.The parameters that affected these characteristics included inlet velocity,equivalence ratio,and structure of porous media.Experimental results showed that combustion wave propagation of a premixed mixture of methane/air combustion was possible at a very low velocity,and the wave velocity was determined by equivalence ratio and pore size of porous media.A larger equivalence ratio resulted in a larger combustion wave velocity.Porous media consisted of 6 mm diameter spheres had a larger combustion wave velocity than those consisted of 3 mm diameter spheres at the same porosity.