PROFILES WITH COANDA EFFECT, NECESSARIES TO WIND TURBINES

The air flow separation around profiles and the wind turbine rotor vibration leading to theblade breaking is a well known phenomenon based on which the present work is conceived. The paperis focused on theoretic and experimental researches effectuated on any profiles with Coanda effect,which are followed with the patenting of three similar profiles.In the frame of theoretical researches the molecular attraction forces of adhesion and cohesion in thenumerical integration of viscous fluid flow around a breaking plate even to the angle of 45o areintroduced, highlighting the advantageous Henri Coanda effect.The experimental researches are effectuated on a profile with Coanda effect, measuring with atwo-component strain gauge balance the lift and aerodynamic drag forces for different profile attackangle, highlighting the increasing of the attack angle from the usual value of 11o to over the 27o forthat profile when the flow separation takes place.