Abstract
Properties of wall normal jets produced by a dielectric barrier discharge (DBD) plasma actuator with a doughnut shaped electrodes have been studied under atmospheric temperature and pressure. DBD plasma is formed near the inner edge of the upper electrode by applying high voltage between the upper and lower electrodes at radio frequencies, inducing tangential jet toward the center of the actuator. As a result, a circular wall normal jet is formed through an impingement of the radial jet. The development of the circular wall normal jet including velocity and vorticity distributions has been examined using particle image velocimetry (PIV) system. Characteristic velocities tend to increase in proportion to the bursting frequency and inversely proportional to the inner diameter of the doughnut shaped electrode when the rising time of voltage is fixed at TE90%=5.0×10-6 sec.
