Flow structure on a simultaneously pitching and rotating wing

M. Bross, D. Rockwell

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

A technique of particle image velocimetry is employed to characterize the threedimensional flow structure on a wing subjected to simultaneous pitch-up and rotational motions. Distinctive vortical structures arise, relative to the well-known patterns on a wing undergoing either pure pitch-up or pure rotation. The features associated with these simultaneous motions include: stabilization of the large-scale vortex generated at the leading edge, which, for pure pitch-up motion, rapidly departs from the leading-edge region; preservation of the coherent vortex system involving both the tip vortex and the leading-edge vortex (LEV), which is severely degraded for pure rotational motion; and rapid relaxation of the flow structure upon termination of the pitch-up component, whereby the relaxed flow converges to a similar state irrespective of the pitch rate. Three-dimensional surfaces of iso-Q{script} and helicity are employed in conjunction with sectional representations of spanwise vorticity, velocity and vorticity flux to interpret the flow physics.

Original languageEnglish (US)
Pages (from-to)354-383
Number of pages30
JournalJournal of Fluid Mechanics
Volume756
DOIs
StatePublished - Oct 10 2014

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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