Abstract
The structure and dynamics of the leading-edge vortex (LEV) were investigated for plunging nite-aspect-ratio wings at a chord Reynolds number of 10,000 while varying aspect ratio and root boundary condition. Stereoscopic particle image velocimetry (SPIV) measurements were used to characterize LEV dynamics and interactions with the plate in multiple chordwise planes. The relationship between the vorticity eld and the spanwise ow eld over the wing, and the inuence of root boundary conditions on these quantities has been investigated. The viscous symmetry plane was found to inuence this ow eld, in comparison to other studies, 1{3 by inuencing tilting of the LEV near the symmetry wall, and introducing a corewise root-to-tip ow near the symmetry plane. Modications in the root boundary conditions were found to signicantly aect this. LEV circulations for the dierent aspect ratio plates were also compared. At the bottom of the downstroke, the maximum circulation was found at the middle of the semi-span in each case. The circulation of the sAR = 2 wing was found to signicantly exceed that of the sAR = 1 wing and, surprisingly, the maximum circulation value was found to be independent of root boundary conditions for the sAR = 2 case and also closely matched that of the quasi-2D case.
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