Accession Number : ADA304465

Title :   Vortex Breakdown Over Unsteady Wings and Its Control.

Descriptive Note : Final technical rept. 30 Sep 92-30 Sep 95,

Corporate Author : CINCINNATI UNIV OH

Personal Author(s) : Gursul, Ismet

PDF Url : ADA304465

Report Date : 16 NOV 1995

Pagination or Media Count : 87

Abstract : Control of vortex breakdown continues to be of vital importance because the breakdown may have a considerable effect on aircraft performance, such as the effect on the time-averaged lift force (Lee and Ho, 1990). Breakdown is also important because of the unsteady nature of flow downstream of vortex breakdown. The unsteadiness may affect the stability of the aircraft and also cause buffeting. The objectives of this work are to understand the physics of unsteady flow phenomena in vortex breakdown region, and to develop techniques for active (feedback) and passive (open loop) control of vortex breakdown over steady and unsteady delta wings.

Descriptors :   *AERODYNAMIC STABILITY, *UNSTEADY FLOW, *DELTA WINGS, *STEADY FLOW, CONTROL, STEADY STATE, AIRCRAFT, PERFORMANCE(ENGINEERING), VORTICES, REGIONS, PHYSICS, BUFFETING, OPEN LOOP SYSTEMS, DOWNSTREAM FLOW, LEADING EDGE FLAPS, VARIABLE SWEEP WINGS.

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE