Aerodynamic optimization of active flow control over S809 airfoil using synthetic jet

In this work, synthetic jet parameters are optimized using response surface methodology (RSM) to improve aerodynamic performances of a S809 profile placed in a flow at a Reynolds number Re = 10
⁶
with an angle of attack of 15.2°. The synthetic jet actuator is positioned on the upper surface of profile at a distance 5% of the chord length from the leading edge. The considered optimization parameters are: amplitude jet (a
_j
), jet frequency (f
_j
) and jet angle (α
_j
). The RSMs are constructed based on a quadratic meta-model established from a BOX-BEHNKEN design. The genetic algorithm (GA) is used to explore the surface and determine the parameters giving best performances. Navier-Stokes equations are solved in unsteady calculation of a two-dimensional domain using ANSYS Fluent software. Turbulence is accounted using the k-w SST model. The obtained results, show that optimization of jet parameters can significantly improve control efficiency. The size of the recirculation zone decreases and CL to CD ratio of the profile is improved by 150%.