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The vortex dynamics of leading-edge vortices on plunging high-Aspect-ratio (ARÂ =Â 10) wings and airfoils were investigated by means of volumetric velocity measurements, numerical simulations and stability analysis to understand the deformation of the leading-edge vortex filament and spanwise instabilities. The vortex filaments on both the wing and airfoil exhibit spanwise waves, but with different origins. The presence of a wing-Tip causes the leg of the vortex to remain attached to the wing upper surface, while the initial deformation of the filament near the wing tip resembles a helical vortex. The essential features can be modelled as the deformation of an initially L-shaped semi-infinite vortex column. In contrast, the instability of the vortices is well captured by the instability of counter-rotating vortex pairs, which are formed either by the trailing-edge vortices or the secondary vortices rolled-up from the wing surface. The wavelengths observed in the experiments and simulations are in agreement with the stability analysis of counter-rotating vortex pairs of unequal strength.
|Journal||Journal of Fluid Mechanics|
|Early online date||11 Apr 2022|
|Publication status||Published - 10 Jun 2022|
- vortex dynamics
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
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- 1 Finished
Three-dimensionality and instabilities of leading-edge vortices
Engineering and Physical Sciences Research Council
2/09/19 → 1/09/22
Project: Research council