Leading-Edge Vortex Improves Lift in Slow-Flying Bats-Reference-Cited by-同舟云学术

Leading-Edge Vortex Improves Lift in Slow-Flying Bats

Published:2008-02-29 Issue:5867 Volume:319 Page:1250-1253
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Muijres F. T.¹²,Johansson L. C.¹²,Barfield R.¹²,Wolf M.¹²,Spedding G. R.¹²,Hedenström A.¹²

Affiliation:

1. Department of Theoretical Ecology, Lund University, SE-223 62 Lund, Sweden.

2. Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089–1191, USA.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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