Research Information System
The 13th International Symposium on Fluid Control, Measurement and Visualization, Doha, Qatar, 15 - 18 November 2015, pp.392-397, (Full Text)
In this study, the effect of the DBD plasma actuator consisting of intermittent electrodes in the lengthwise direction of circular cylinder is investigated. The intermittent DBD plasma actuators attached on the flow separation point of the circular cylinder are used as an active flow control device so as to improve the flow characteristics. The experiments were conducted in the wind tunnel at Re=6000. The diameter of the circular cylinder is 40 mm and its spanwise length between the end plates is 400 mm. In three cases, the lengths of the actuators and gaps between them are chosen as 20 mm, 25 mm, and 50 mm, respectively. The applied voltage is 6.5 kVpp and the applied frequency is 3.5 kHz for producing plasma. By using the equally placed DBD plasma actuators for the circular cylinder, 2D flow structure in the wake region is turned into 3D flow structure that leads to reduce in the mean and fluctuating forces acting on the cylinder. The change in the wake region of the circular cylinder was visualized by conducting the smoke-wire method. Force measurements were also implemented to determine the drag and lift forces by using a load cell. The change in the drag and lift forces of the circular cylinder with intermittent DBD plasma actuators was compared with both the plain circular cylinder and the circular cylinder with thoroughly placed DBD plasma actuators.