The paper discusses the results of wind tunnel tests of airfoils with additional active
airflow applied to their upper surfaces. These studies were carried out for a range of
velocities up to 28 m/s in an open wind tunnel. Several types of airfoils selected for
the examination feature different geometries and are widely applied in today’s aviation
industry. The changes in the lift and drag force generated by these airfoils were
recorded during the study. The test bench for the tests was equipped with a compressor
and a vacuum pump to enable airflow through some holes on the airfoil upper surface.
A rapid prototyping method and a 3D printer based on a powder printing technique
were applied to print the airfoils. All of their surfaces were subject to surface grinding
to smooth their external surfaces. The wind tunnel tests with and without active
airflow applied to airfoils are summarised in the paper.