Numerical simulation of methane-hydrogen premixed flames on a Bunsen burner

抄録

Two-dimensional axisymmetric numerical simulations were performed for a Bunsen flame to investigate the OH concentration and heat release rate of methane-hydrogen premixed flames. The OH production rate of the premixed flame increases as the hydrogen ratio in the fuel increases. Resultantly, the OH concentration in the premixed flame increases with the larger heat release rate, but the OH concentration in the diffusion flame remains almost unchanged. The higher the total equivalence ratio, the greater the change in OH concentration and the heat release rate. This could be due to the fact that most of the hydrogen in the fuel reacts in the premixed flame. Independent of the total equivalence ratio, the relationship between the maximum OH concentration in the premixed flame and the OH fluorescence intensity measured by the PLIF technique shows some similarity in both methane and methane-hydrogen flames. Since the same linearity between the maximum value of the heat release rate and the burning velocity is observed, it is derived that the heat release rate in the premixed flame can be estimated by the burning velocity.