Volumetric measurements and simulations of the vortex structures generated by low aspect ratio plunging wings

D. E. Calderon , Zhijin Wang, I. Gursul, M. R. Visbal

Research output: Contribution to journalArticle (Academic Journal)

19 Citations (Scopus)

Abstract

Volumetric three-component velocimetry measurements have been performed on low aspect ratio wings undergoing a small amplitude pure plunging motion. This study focuses on the vortex flows generated by rectangular and elliptical wings set to a fixed geometric angle of attack of alpha = 20 degrees. An investigation into the effect of Strouhal number illustrates the highly three-dimensional nature of the leading edge vortex as well as its inherent ability to improve lift performance. Computational simulations show good agreement with experimental results, both demonstrating the complex interaction between leading, trailing, and tip vortices generated in each cycle. The leading edge vortex, in particular, may deform significantly throughout the cycle, in some cases developing strong spanwise undulations. These are at least both Strouhal number and planform dependent. One or two arch-type vortical structures may develop, depending on the aspect ratio and Strouhal number. At sufficiently high Strouhal numbers, a tip vortex ring may also develop, propelling itself away from the wing in the spanwise direction due to self-induced velocity. (C) 2013 AIP Publishing LLC.

Original languageEnglish
Article number067102
Number of pages22
JournalPhysics of Fluids
Volume25
Issue number6
DOIs
Publication statusPublished - Jun 2013

Keywords

  • LOW REYNOLDS-NUMBERS
  • PARTICLE TRACKING
  • LIFT ENHANCEMENT
  • FLAPPING FOILS
  • FLOW STRUCTURE
  • SCHEMES
  • AIRFOIL

Cite this