Leading-edge vortices over swept-back wings with varying sweep geometries

William B. Lambert, Mathew J. Stanek, Roi Gurka, Erin E. Hackett

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Micro air vehicles are used in a myriad of applications, such as transportation and surveying. Their performance can be improved through the study of wing designs and lift generation techniques including leading-edge vortices (LEVs). Observation of natural fliers, e.g. birds and bats, has shown that LEVs are a major contributor to lift during flapping flight, and the common swift (Apus apus) has been observed to generate LEVs during gliding flight. We hypothesize that nonlinear swept-back wings generate a vortex in the leadingedge region, which can augment the lift in a similar manner to linear swept-back wings (i.e. delta wing) during gliding flight. Particle image velocimetry experiments were performed in a water flume to compare flow over two wing geometries: one with a nonlinear sweep (swift-like wing) and one with a linear sweep (delta wing). Experiments were performed at three spanwise planes and three angles of attack at a chordbased Reynolds number of 26 000. Streamlines, vorticity, swirling strength, and Q-criterion were used to identify LEVs. The results show similar LEV characteristics for delta and swift-like wing geometries. These similarities suggest that sweep geometries other than a linear sweep (i.e. delta wing) are capable of creating LEVs during gliding flight.

Original languageEnglish
Article number190514
JournalRoyal Society Open Science
Issue number7
StatePublished - 1 Jul 2019
Externally publishedYes


  • Delta
  • Leading-edge vortex
  • Particle image velocimetry
  • Swept-back wings
  • Swift

ASJC Scopus subject areas

  • General


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