Electromechanical efficiency improvement of the surface DBD by composite dielectric

The induced airflow velocity level and the mechanical efficiency are the significant issues for the surface DBD flow control application. In this paper, the effects of optical characteristics, electrical performances and mechanical properties of surface DBD with composite dielectric glass/PI film are investigated. The current, discharge plasma morphology, electrical power consumption, and induced airflow velocity are analyzed at applied voltage 17-23 kV with working frequency 9.15 kHz. The experiment results indicate that with the addition of PI film, the discharge just occurs near the exposed electrode and is suppressed obviously in the negative half cycle of current. Though the induced airflow velocity decreases slightly about 0.1-0.2 m/s at each voltage level, the mechanical efficiency substantially improves. The maximum mechanical efficiency increases by 25.12% under the 23 kV.