Flow control over a maneuvering delta wing at high angles of attack

The possibility of delaying vortex breakdown to higher angles of attack by employing control surfaces is studied experimentally. The effect of an apex flap is tested for fixed and dynamically pitching delta wings. Flow visualization, surface pressure measurements, and laser-Doppler velocimetry are employed to map out pressure, velocity, and vorticity fields. It is found that a drooping apex flap can delay vortex breakdown by an angle of 8 deg beyond the steady flow breakdown angle of attack. The apex flap effect is equally pronounced in dynamic maneuvers.

[1]  Robert Martin,et al.  FLOW CONTROL OVER DELTA WINGS AT HIGH ANGLES OF ATTACK , 1993 .

[2]  Chih-Ming Ho,et al.  Unsteady vortical flow around three-dimensional lifting surfaces , 1986 .

[3]  Jerome T. Kegelman,et al.  Effects of leading-edge shape and vortex burst on the flowfield of a70-degree-sweep delta-wing , 1989 .

[4]  O. Rediniotis,et al.  The temporal evolution of a pair of streamwise vortices , 1995 .

[5]  Donald Rockwell,et al.  Instantaneous topology of the unsteady leading-edge vortex at high angle of attack , 1993 .

[6]  Robert C. Nelson,et al.  Delta wing surface pressures for high angle of attack maneuvers , 1990 .

[7]  D. Rockwell,et al.  Unsteady crossflow on a delta wing using particle image velocimetry , 1992 .

[8]  Multi-sensor investigation of delta wing high-alpha aerodynamics , 1991 .

[9]  Donald Rockwell,et al.  Control of leading-edge vortices on a delta wing , 1989 .

[10]  I. Gursul,et al.  Active control of vortex breakdown over delta wings , 1994 .

[11]  Dhanvada M. Rao,et al.  Vortical flow management techniques , 1987 .

[12]  Donald Rockwell,et al.  Control of vortices on a delta wing by leading-edge injection , 1993 .

[13]  D. Rockwell,et al.  Laser-scanning particle image velocimetry applied to a delta wing in transient maneuver , 1993 .

[14]  R. C. Nelson,et al.  Control of leading edge vortex breakdown by blowing , 1988 .

[15]  Chih-Ming Ho,et al.  Lift Force of Delta Wings , 1990 .

[16]  L. Roberts,et al.  The control of vortical lift on delta wings by tangential leading edge blowing , 1987 .

[17]  Othon K. Rediniotis,et al.  Pitch-up motions of delta wings , 1992 .

[18]  L. Roberts,et al.  The control of vortical flow on a delta wing at high angles of attack , 1987 .

[19]  John E. Lamar.  Nonlinear lift control at high speed and high angle of attack using vortex flow technology , 1986 .

[20]  O. Rediniotis,et al.  Dynamic pitch-up of a delta wing , 1994 .

[21]  I Gursul,et al.  Control of vortex breakdown with leading-edge devices , 1995 .

[22]  Donald Rockwell,et al.  Leading-edge vortices due to low Reynolds number flow past a pitching delta wing , 1990 .