LOW-SPEED EXPERIMENTAL INVESTIGATIONS OF VORTEX CONTROL CONCEPTS ON A GENERIC CHINE FOREBODY/DELTA WING CONFIGURATION AT HIGH ANGLES ...

AN EXPERIMENTAL FEASIBILITY STUDY IS PROPOSED OF TWO SEPARATE AERODYNAMIC CONCEPTS FOR DIRECT AND INDEPENDENT CONTROL OF CHINE FOREBODY VORTICES AT HIGH ANGLES OF ATTACK AND IN SIDESLIP: (A) LONGITUDINALLY HINGED CHINES THAT CAN BE MOVED TO VARIABLE DIHEDRAL OR ANHEDRAL ANGLE; AND (B) SPANWISE JET-SHEET BLOWN HORIZONTALLY FROM SLOTS LOCATED ALONG THE CHINE EDGE. BOTH APPROACHES ENVISAGE CONTROLLING STRENGTH AND TRAJECTORY OF THE SHED CHINE VORTEX PAIR, EITHER IN UNISON OR DIFFERENTIALLY, TO MODIFY THE MERGER AND BREAKDOWN OF THE VORTEX SYSTEM OVER THE WING AND THEREBY CONTROL THE WING LIFT CHARACTERISTICS PARTICULARLY IN THE C(L) MAX AND POST-STALL REGIME. IN A LOW-SPEED WIND TUNNEL STUDY OF THE TWO CONCEPTS APPLIED TO A COMMON GENERIC HINE FOREBODY/55 DEG DELTA WING CONFIGURATION, WING UPPER-SURFACE SUCTION PRESSURE MEASUREMENTS AND SUPPORTING SMOKE FLOW VISUALIZATIONS WILL BE OBTAINED FOR AN INITIAL QUANTITATIVE EVALUATION OF CONTROL EFFECTIVENESS AND ASSOCIATED VORTICAL FLOW CHARACTERISTICS, AT ANGLES OF ATTACK UP TO 60 DEG. AND SIDE-SLIP ANGLES TO +/20 DEG.