experimental investigation of flow turbulence effects on the flow wake parameters around a naca0012 airfoil

in this paper, inflow turbulence effects on the flow wake parameters around a naca0012 airfoil at zero incidence angle and reynolds number of 38,700 were investigated. various turbulence promoter networks were used to achieve turbulence intensity of 5% and 6%. experiments have been conducted for three different turbulence intensities in which mean velocity parameters, turbulence intensity, frequency response, and strouhal number were measured. half of the wake width (b1/2) in all three cases of turbulence, was increased with increasing x/d and turbulence intensity. it was also found that vortex formation length is decreased with turbulence intensity. besides, it became clear that strouhal number is reduced with any increase in turbulence intensity or in the distance from the trailing edge of the airfoil.