The effect of the non-equilibrium plasma superposition on the ammonia / oxygen / nitrogen unburned premixed gas was investigated to improve the laminar burning velocity as the combustion characteristics. When ammonia was used as a fuel, it was necessary to improve the laminar burning velocity of ammonia premixed flame because the combustion characteristics of ammonia were too lower than those of fossil fuel. The plasma-assisted combustion was the one of the methods to improve the combustion characteristics. Especially, the effect of the dielectric barrier discharge (DBD) on the burning velocity as the indicator of combustion quality of ammonia was experimentally investigated in this study. In experiments, a slot burner was used to measure the burning velocity. DBD was superimposed on ammonia / oxygen / nitrogen unburned premixed gas just before it was entered into the flame zone. To understand effects of the condition of the electric power source of DBD, the peak to peak voltage of DBD was varied from 0 kV to 30 kV. The equivalence ratio was varied from 1.0 to 1.2. The results showed that the burning velocities became faster with increasing the peak to peak voltage of DBD, the largest increase of the burning velocity was observed at the stoichiometric condition in all conditions of the DBD power source.

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