Particle image velocimetry experiments and simulations were conducted in this study to clarify the influence of the DBD plasma actuator on the flow over a flat plate.The result shows that the actuator not only effectively leads to a local rise in near-wall velocity,but also efficiently causes a decrease in the displacement thickness of the boundary layer.Actuator-induced vorticity is generated to intensify the energy exchange between the main flow and the boundary layer,and dynamic energy is thus added directly to the low-energy fluid by the actuator.Although the increase in fluid velocity also brings a rise in dynamic energy loss,the energy added by the actuator can cover this to provide growth in the energy of the boundary layer.The plasma actuator presents a better performance when the free-stream velocity is lower.
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