Multiple leading edge vortices of unexpected strength in freely flying hawkmoth.

Abstract:

:The Leading Edge Vortex (LEV) is a universal mechanism enhancing lift in flying organisms. LEVs, generally illustrated as a single vortex attached to the wing throughout the downstroke, have not been studied quantitatively in freely flying insects. Previous findings are either qualitative or from flappers and tethered insects. We measure the flow above the wing of freely flying hawkmoths and find multiple simultaneous LEVs of varying strength and structure along the wingspan. At the inner wing there is a single, attached LEV, while at mid wing there are multiple LEVs, and towards the wingtip flow separates. At mid wing the LEV circulation is ~40% higher than in the wake, implying that the circulation unrelated to the LEV may reduce lift. The strong and complex LEV suggests relatively high flight power in hawmoths. The variable LEV structure may result in variable force production, influencing flight control in the animals.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Johansson LC,Engel S,Kelber A,Heerenbrink MK,Hedenström A

doi

10.1038/srep03264

subject

Has Abstract

pub_date

2013-11-20 00:00:00

pages

3264

issn

2045-2322

pii

srep03264

journal_volume

3

pub_type

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