Spatiotemporal evolution laws of sector-shaped dielectric-barrier-discharge plasma actuator

Abstract Dielectric barrier discharge (DBD) plasma actuators are widely used in active flow control due to their simple design and rapid responsiveness. However, they need more effectiveness and discharge extension. To overcome these limitations, a sector-shaped dielectric barrier discharge (SS-DBD) plasma actuator with an adjustable jet angle was developed to enhance flow control effectiveness. The flow field dynamics induced by the SS-DBD plasma actuator were quantitatively analyzed using particle image velocimetry (PIV). Experimental investigations showed that precise adjustments to the actuation voltage can modulate the maximum velocity of the induced jet. Furthermore, a quasi-linear relationship between the sector-shaped angles of the SS-DBD and the deflected jet angles was established, indicating that changes in the sector-shaped angles directly influence the direction of the deflected jet. This correlation enables precise control over jet angles, significantly enhancing flow control by adjusting the SS-DBD-PA’s sector-shaped angle.