An Experimental and Comparative Investigation of the Effect of Turbulence Wire Tripping on the Wake Characteristics of an Asymmetric Airfoil with Circular Cylinder

This study empirically investigates the effect of turbulence promoter wire installation on the flow parameters of airfoil wake and wake flow characteristics such as average velocity and the turbulence intensity in the Reynolds number 3780 for airfoil and Reynolds number 30000 for the cylinder. The diameter of the wires was 1, 1.5, and .5 mm. The wire was installed with in the airfoil thickness of NACA0012 and in the circular cylinder α=140.40 angle. The diameter of the wire has changed to obtain different turbulence flow. The current study shows the width and height of the velocity profiles have increased with an increase in the diameter. The outflow of the wake area was the same for all of the parameters. The rate of change of velocity and the turbulence of cylinder and the airfoil has been compared. The results showed that the drag coefficient has increased with an increase in the diameter of the wire in airfoil, and the cylinder has changed depending on the wire diameter. For the cylinder in Re=30000, there is an optimal state in which the active drag coefficient on the cylinder reaches to the lower value of the cylinder coefficient drag. The experiments show that the values of the height profile of turbulence and the decrease of velocity in the cylinder wires have been decreased in comparison with that of a flat cylinder.