Accession Number : ADA424329


Title :   High Angle of Attack Aerodynamics by Excitation of the Locked Leeside Vortex


Descriptive Note : Final rept. 1 Jan 1986-30 Sep 1998


Corporate Author : TENNESSEE UNIV TULLAHOMA


Personal Author(s) : , A D ; Wu, J M ; Bhat, M K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a424329.pdf


Report Date : Sep 1988


Pagination or Media Count : 135


Abstract : The control of flow over a multi-element wing has been investigated. At large incidence angles, the flow becomes fully separated. The wing geometry was considered critical to management of flow energy through organization of vorticity and controlling its shedding on the upper wing surface. A flat plate wing, with the planform of a F-15 wing, was reconfigured to accommodate the locked vortex. Spanwise blowing was used to initiate and/or increase the strength of the vortical flow. It was anticipated that in this manner an excited, stable, concentrated and strong vortex would be created on the wing. Using flow visualization as well as force measurements, it was found that the presence of the locked vortex favorably changed the flow pattern over the wing. Force measurements indicate moderate improvements on most configurations. One configuration showed more significant effect; but this should be considered preliminary.


Descriptors :   *VORTICES , *ANGLE OF ATTACK , *AERODYNAMICS , EXCITATION , FLOW VISUALIZATION , GEOMETRIC FORMS , WINGS , ANGLE OF INCIDENCE , FORCE(MECHANICS) , HIGH ANGLES


Subject Categories : Aerodynamics
      Aircraft
      Flight Control and Instrumentation
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE