Study of diffusion control in circular jet using concentric-type DBD plasma actuator

Abstract

An investigation was carried out into diffusion control for a circular jet using a concentric dielectric barrier discharge plasma actuator, focusing on the effects of electrode size, driving frequency and applied voltage. The actuator was found to induce a flow that was first directed toward the center of the jet, and that was then ejected along the jet central axis. The plasma-induced flow caused an increase in the velocity of the jet, allowing control of velocity fluctuations and the three-dimensional collapse of the jet structure. Increasing the size of the electrode led to an increase in both the volume flow rate and the width of the main jet. In contrast, a smaller electrode caused enhanced contraction of the jet. The results indicated that the actuator provided an effective means of controlling diffusion in the jet.