Effects of freestream turbulence on wing-tip vortex formation and near field

S. C.C. Bailey, S. Tavoularis, B. H.K. Lee

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

The formation and near-field development of a wing-tip vortex under the influence of freestream turbulence were examined using flow visualization and hot-wire anemometry. A low turbulence freestream as well as two cases of grid turbulence with different intensities and length scales were considered. In all cases, the tip vortex was found to form from three smaller vortices, but the turbulence in its core was found to intensify with increasing freestream turbulence. The vortex trajectory was found to be unaffected by freestream turbulence, but the wing wake that was rolling up around the vortex was observed to have a curvature that decreased as freestream turbulence increased. The mean axial velocity distribution in the low-turbulence case was neither jetlike nor wakelike but had an annular shape. Time-averaged velocity profiles measured in the turbulent freestream cases were wakelike, and it was inferred that the instantaneous profiles would be significantly affected by vortex meandering. Mean circumferential velocity distributions in the vortex core displayed self-similar developments in all cases examined. Finally, it was found that the apparent diffusion in the shear layer shed from the wing increased with increasing freestream turbulence.

Original languageEnglish
Pages (from-to)1282-1291
Number of pages10
JournalJournal of Aircraft
Volume43
Issue number5
DOIs
StatePublished - 2006

Bibliographical note

Funding Information:
Financial support was provided by Natural Sciences and Engineering Research Council of Canada. The four-sensor probe was provided by Petar Vukoslavcˇević. Petar Vukoslavcˇević and Metin Yaras are gratefully acknowledged for their assistance in the early stages of this work.

ASJC Scopus subject areas

  • Aerospace Engineering

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