EFFECT OF SPANWISE BLOWING IN THE ANGLE-OF-ATTACK REGIME alpha equals 0 plus 90 degree .

Results are presented of joint Franco-German investigations carried out to find out the benefits of spanwise blowing at subsonic speeds and high angles of attack. Aerodynamic and system-integrated effects due to concentrated spanwise blowing are demonstrated regarding stability and control, as well as high-lift performances and -boundaries for a basic fighter-type model. As the first step, the position of the blowing jet was optimized relative to the wing upper surface. Configurational items were considered such as clean wing, strake wing, and high lift configuration, as the second step, the angle of attack regime investigated was extended up to 90 degree for the selected strake-wing configuration. An analysis of the results shows marked improvements of aerodynamic characteristics utilizing concentrated spanwise blowing, which proves to be powerful and simple means to increase maneuver performances at high angles-of-attack.