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Vortex development on pitching plates with lunate and truncate planforms

  • Colin Hartloper (a1) and David E. Rival (a1)

Abstract

The three-dimensional flow field and instantaneous forces are measured on pitching rectangular, lunate and truncate planforms of aspect-ratio four. The leading-edge vortex on the rectangular planform is compressed as it grows, and subsequently forms an arch-shaped vortex. For the lunate and truncate planforms, which both have identical spanwise leading-edge curvature but differ in planform area, outboard-directed convection of vorticity, rather than vortex stretching, mitigates arch-vortex formation. The vortical near wake that is formed by the planforms with spanwise leading-edge curvature is found to be strongly correlated with a favourable lift-to-drag ratio during the force-relaxation phase.

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Corresponding author

Email address for correspondence: derival@ucalgary.ca

References

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Type Description Title
VIDEO
Movies

Hartloper and Rival supplementary movie
Isosurfaces of z-vorticity (red) and xy-vorticity (green) on rectangular, lunate and truncate planforms from left to right.

 Video (8.9 MB)
8.9 MB
VIDEO
Movies

Hartloper and Rival supplementary movie
Isosurfaces of inboard-directed (yellow) and outboard-directed (blue) z-velocity on rectangular, lunate and truncate planforms from left to right.

 Video (6.9 MB)
6.9 MB

Vortex development on pitching plates with lunate and truncate planforms

  • Colin Hartloper (a1) and David E. Rival (a1)

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