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Vortex wakes of birds: recent developments using digital particle image velocimetry in a wind tunnel

In English

Författare

Summary, in English

A flying animal generates a trail of wake vortices that contain information about the time history and magnitude of aerodynamic forces developed on the wings and body. Methods for visualising and recording wake vortices have been developed, allowing quantitative measurements by digital particle image velocimetry (DPIV). Results from DPIV experiments in a wind tunnel are presented for four passerine species of differing size and morphology. The normalised vorticity and its integrated quantity, circulation (Gamma) both decline gradually with increasing flight speed. The measured circulations are successfully explained by a simple aerodynamic model where a normalised circulation, Gamma/Uc, represents half the time-averaged lift coefficient, which is > 2 at 4 m s(-1) for a thrush nightingale.

Publiceringsår

2006

Språk

Engelska

Sidor

535-549

Publikation/Tidskrift/Serie

Animal Biology

Volym

56

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Brill

Ämne

  • Biological Sciences

Nyckelord

  • added mass
  • bird flight
  • digital particle image
  • velocimetry
  • DPIV
  • vortex wakes
  • aerodynamics

Status

Published

Forskningsgrupp

  • Animal Flight Lab

ISBN/ISSN/Övrigt

  • ISSN: 1570-7555