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Control of burning velocity in premixed burner flame by high-energy electrons of dielectric barrier discharge

We activated combustion reactions by superposing a dielectric barrier discharge (DBD) onto a premixed burner flame with CH4/O2/Ar mixture gas. We observed the shrinkage of the reaction zone by the superposition of DBD. The shrinkage of the reaction zone indicates the enhancement of the burning velocity in the flame. The enhancement of the burning velocity was not caused by thermal effects, since we detected no increase in the gas temperature by the superposition of DBD. On the other hand, we found a unique relationship between the magnitude of the shrinkage of the reaction zone and the optical emission intensity of argon. This experimental result reveals that the enhancement of the burning velocity is determined by the energy and the density of electrons. The superposition of DBD realizes nonequilibrium combustion chemistry in the premixed burner flame, where the energy and the density of electrons are the most important parameters for determining the burning velocity.