Optimization of Dielectric Barrier Discharge Plasma Actuators with High-Voltage DC Augmentation

Abstract

Dielectric barrier discharge (DBD) plasma actuator for aerodynamic lift, drag, and separation control has grown extremely popular over the past several years. DBD actuators offer several attractive features for active flow control including instantaneous response and no moving parts. However, proven applications of DBD are currently limited to low external flow speeds due to limited DBD forcing. Further optimization and thrust augmentation through additional electrodes and varying electrode geometries are presented over a range of high voltages and frequencies. Combined, high-voltage DC electrodes downstream of a serrated plasma actuator are found to increase the plasma actuator thrust by over 200% compared to traditional straight DBD actuators and surpass 100 mN/m. Direct thrust measurements, velocity profiles, and overall electrical parameters are characterized. The optimization allows DBD plasma actuators to control and modify a fluid system more effectively and at more robust conditions.