Flow passive control on the naca airfoils experimental and numerical study

Passive flow control by vortex generators (VGs) is the simplest solution to delay or eliminate the separation of the fluid from the wall. The present work concerns the effectiveness of a new geometry of VGs shaped delta wings implanted on the upper surface of two airfoils NACA (4412 and 0015). The experimental measurements in a wind tunnel at two Reynolds numbers show a significant aerodynamic performances improvement leading to an increase in the lift of 27% and a decrease in the drag of about 30% after stall. The results are in a good agreement with those given by a three dimensional simulation undertaken with a CFD commercial code (Fluent)