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Dynamic stall control on flapping wing airfoils

Geissler, Wolfgang and van der Wall, Berend G. (2017) Dynamic stall control on flapping wing airfoils. Aerospace Science and Technology (62), pp. 1-10. Elsevier. DOI: 10.1016/j.ast.2016.12.008 ISSN 1270-9638

Full text not available from this repository.

Abstract

Flapping wing efficiency is limited by flow separation effects. The time dependent development of a leading edge vortex (LEV) during rapid pitch-up motion of a retreating helicopter roter blade is known as dynamic stall vortex. Movement of this vortex along the airfoil upper surface first increases lift but later the vortex lifts off the airfoil surface causing streng drag rise, severe nose-down pitching moments, and possibly negative aerodynamic damping. Very similar effects can be observed on flapping airfoils and wings experiencing combined plunging (heaving) motion and pitching motion. With increasing plunge amplitude the flow on the flapping wing starts to separate and concentrated dynamic stall vortices may develop on both upper and lower wing surfaces. Under these conditions it is shown that wing propulsion efficiency is considerably reduced. Recent investigations of dynamic stall control have shown that a streng vortex may be avoided by appropriate airfoil deformation. lt will be shown in the present paper that with dynamic airfoil deformation the propulsion efficiency can be improved considerably. The validity of the numerical calcu lations is first tested against existing data from literature.

Item URL in elib:https://elib.dlr.de/110933/
Document Type:Article
Additional Information:Volume 62
Title:Dynamic stall control on flapping wing airfoils
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Geissler, WolfgangWolfgang.Geissler (at) dlr.deUNSPECIFIED
van der Wall, Berend G.berend.vanderwall (at) dlr.dehttps://orcid.org/0000-0001-6144-0921
Date:2017
Journal or Publication Title:Aerospace Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.ast.2016.12.008
Page Range:pp. 1-10
Publisher:Elsevier
ISSN:1270-9638
Status:Published
Keywords:Flapping wing aerodynamic, Dynamic stall, Dynamic stall control, MAV-aerodynamics, Bird and insect flight
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Institute of Flight Systems > Rotorcraft
Deposited By: Bachmann, Barbara
Deposited On:08 Dec 2017 12:08
Last Modified:08 Dec 2017 12:08

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