Aircraft control at high-alpha by tangential blowing

An experimental study has been undertaken to investigate the possibility of using tangential blowing to provide control forces and moments on a delta wing-forebody combination at high angles of attack. The present model can utilize the blowing separately on the wing and forebody. This research emphasizes the effect of blowing on the aerodynamics of the state of the art model by using: (1) flow visualization (smoke-flow visualization using a laser sheet), and (2) force and moment measurements. Experiments revealed that the effect of the blowing on a body-wing combination differs in several respects compared to that of wing alone or body alone. Force and moment measurements on the present model showed that the asymmetric blowing from the fuselage creates larger side force, rolling and yawing moments compared to blowing from the wing. In the presence of the forebody, the effectiveness of the rolling moment generated by blowing from the wing is reduced.