Abstract:
The paper presents the results of a study of the effect of methane dilution with hydrogen on the electrochemical properties of the flame. Both diffusion flames and combustion of a premixed mixture in a Bunsen burner were considered. It was found that for mixtures with a molar fraction of methane in the fuel of more than 40%, the electric current linearly depends on the amount of methane. When the molar fraction of methane in the mixture is less than 40%, the dependence becomes nonlinear. The transition boundary from linear to nonlinear relationship between the magnitude of the flowing current and the amount of methane in the fuel mixture does not depend on the flow rate, the shape of the electrodes, and the combustion mode (diffusion, premixed fuel-air mixture). Registration of the chemiluminescence of the CH$^*$ radical demonstrates a similar dependence of the flame glow intensity on the volume fraction of methane in the fuel.
