Numerical Investigation of Suction and Length of Suction Jet on Aerodynamic Characteristics of the NACA 0012 Airfoil

摘要

In this study, the effect of suction and the parameters affecting this process including suction amplitude, suction coefficient and the suction jet width in order to numeric flow control on an NACA 0012 airfoil was evaluated. Flow was fully turbulent with the Reynolds number of 5 × 105 and the turbulence employed model was the Menter's shear stress model. Suction on the airfoil was considered to be normal and uniform (perpendicular suction) and suction jet widths were 1.5, 2, 2.5 and 3 percent of the chord length. Based on previous studies, suction jet is located in optimal distance, 10 percent of the chord length from the leading edge. The range of suction jet entrance velocity was selected from 0.1 to 0.5 of freestream velocity. Results of this study demonstrated that the lift coefficient increased and drag coefficient decreased while suction amplitude rose. The maximum increase in lift to drag ratio was seen at suction amplitude of 0.5. In addition, the lift to drag ratio elevated when suction jet width increased and reached to its maximum value at 2.5 percent of the chord length.