ELf C-T D.istribution Unlimited , Unsteady separated flows produced by three different delta wings driver with constant pitch rates were investigated using high speed flow visualization. The large scale vortices produced were initially similar to those produced above delta wings driven sinusoidally. Subsequently, the vortices either convected away from the wing or were broken up by the complex three-dimensional flow field. Both initiation and development of the leading edge vortices were

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... nt upon planform geometry and nondimensional pitch rate. Variations in vortex characteristics and duration with spanwise position were also noted. Smoke wire visualization proved a valuable tool in assessing the three-dimensional characteristics of the unsteady fP,;w field. / . ) flow visualization 13 -flow separation. delta wings, UN(1ASSIFED UNCLASSIFIED UNCLASSIFIED NONE AccOssion For NTIS GRA&I DTIC TAB