Study on the influence of actuation parameter of SDBD on induced jet in low-pressure air

Abstract

Surface dielectric barrier discharge (SDBD) is an important form of atmospheric discharge. The present study uses particle image velocimetry to investigate the influence of the duty cycle and pulse frequency on the flow field of plasma-induced jets and turbulent flow features for high-frequency high-voltage AC actuation under a low pressure of 7 kPa. The results prove that the SDBD plasma induces a suction flow and a horizontal tangential flow. Both the duty cycle and the pulse frequency have significant effects on the induced flow field. With the increasing duty cycle, the length and velocity of the jets increase linearly, the exit angle increases, and the Reynolds number of the tangential jet increases. The tangential jet transitions from turbulent to laminar flow as the duty cycle increases. As the pulse frequency increases, both the length of the tangential jet and the exit angle decrease gradually, and this trend accelerated near 30 Hz. The Reynolds number of the tangential jet increases to a maximum and then decreases with the increasing pulse frequency, with a peak near 50 Hz. The pulse frequency has little effect on the velocity of the jets or the turbulent flow characteristics of the tangential jet. A low duty cycle and a low pulse frequency should be adopted to increase the turbulent flow area and jet size to achieve a better actuation effect.