Performance evaluation and design optimization of sector-shaped dielectric-barrier-discharge plasma actuator

Plasma aerodynamic actuation generates induced jets through gas ionization and directional movement of charged particles under an electric field. The angle between the jet and the wall critically determines its applicability. Based on multi-jet synthesis theory, this study designs sector-shaped dielectric barrier discharge (DBD) plasma actuators with varying induced jet angles. The relationships between the central angle, jet synthesis velocity, and energy efficiency are analyzed. The electrical, thermodynamic, and aerodynamic characteristics of actuators with different central angles are explored, and a comprehensive performance analysis is conducted. Results show that, compared to the annular DBD plasma actuator, the 240° sector-shaped DBD plasma actuator achieves an 84.1% increase in overall efficiency, with the synthesized jet angle closer to 37°. The 120° sector-shaped DBD plasma actuator achieves an 13.4% increase in overall efficiency, with the synthesized jet angle closer to 59°. This research offers new insights for optimizing the geometric configuration of plasma actuators.