Influence of different blowing parameters on flow control on an airfoil
Keywords:flow control, active control, numerical simulation, separation
A numerical study on flow separation control is conducted for an airfoil with a blowing jet. In this regard, the effect of different parameters of air blowing on stall controlling and flow structure over NACA 0012 is followed. RANS equations were employed in conjunction k-ω-SST turbulent model. To validate the numerical results, they are compared with reported experiments, and good agreement is observed. In this paper, the effects of different parameters like blowing location, angle of jets, and local jet velocity are investigated in various cases. Blowing location in the range of 0.1-0.9 of chord length from the leading edge, local jet velocities of 0.1, 0.3, and 0.5 of free stream velocity, and angles of 30o, 60o, and 90o are studied. Results reveal that blowing near airfoil ending increases the ratio of lift/drag coefficients. Furthermore, blowing near the angle of 30o prove a positive effect on aerodynamic characteristics. Using a jet velocity equal to the half of free stream velocity shows a favorable effect on blowing. Blowing the flow never revealed to weaken vortices, and therefore it is not recommended to use blowing jet.
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