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Leading edge vortex improves lift in slow-flying bats

Författare:
Publiceringsår: 2008
Språk: Engelska
Sidor: 1250-1253
Publikation/Tidskrift/Serie: Science
Volym: 319
Nummer: 5867
Dokumenttyp: Artikel
Förlag: AAAS American Association for the Advancement of Science

Sammanfattning

Staying aloft when hovering and flying slowly is demanding. According to quasi-steady-state aerodynamic theory, slow-flying vertebrates should not be able to generate enough lift to remain aloft. Therefore, unsteady aerodynamic mechanisms to enhance lift production have been proposed. Using digital particle image velocimetry, we showed that a small nectar-feeding bat is able to increase lift by as much as 40% using attached leading-edge vortices (LEVs) during slow forward flight, resulting in a maximum lift coefficient of 4.8. The airflow passing over the LEV reattaches behind the LEV smoothly to the wing, despite the exceptionally large local angles of attack and wing camber. Our results show that the use of unsteady aerodynamic mechanisms in flapping flight is not limited to insects but is also used by larger and heavier animals.

Disputation

Nyckelord

  • Biology and Life Sciences

Övriga

Published
Yes
  • Migration Ecology
  • ISSN: 0036-8075
  • ISSN: 1095-9203

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