Active Vortex Generation using Dielectric-Barrier Discharge Plasmas

摘要

The main objective of this study is to investigate the active and sustained vortex generation in a laminar boundary layer using spanwise acting plasma actuators. The wind tunnel experiments are conducted on a flate plate with a freestream velocity of U_∞, = 8m/s, with the streamwise length of the electrodes significantly longer than in previous studies. As a result of longitudinal counter-rotating vortices, the boundary layer is modulated with streaks of higher and lower velocity. The amplitudes of the induced high and low-speed streaks in the boundary layer, measured with hot-wire probes downstream of the actuator arrays, provide a measure for the flow control success. Several geometric parameters and different operation modes have been investigated and reveal the complex interaction of all operating parameters. In a second set of experiments a proof of concept is presented, showing the attenuation of the amplitude of TS waves by streamwise streaks generated by a plasma actuator vortex generator array.