Influence of nozzle exit velocity distribution on flame stability using a coaxial DBD plasma actuator

Abstract

In this study, a coaxial dielectric barrier discharge plasma actuator (DBD-PA) is applied to control the flame shape, the control to maintain excellent flame stability is attempted. DBD-PA consists of an exposed electrode, an insulated electrode, and a dielectric layer. In a convergent round nozzle having an exit inner diameter of d = 6 mm, the electrode set was arranged coaxially with the nozzle. DBD-PA is applied to the control of the flame stability on condition equivalence ratio: ϕ = 0.85, 1.00. Premixed gas of air and propane was used for fuel. The applied voltage is 5–8 kV and OFF, and frequency is 8 kHz constant. Flame stability limit is taken with a high speed camera. The center of inner flame assumes a crown shape. It is thought that this is due to a change in velocity distribution in the free boundary layer by the effect of the DBD-PA induced flow.