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Motion induced unsteady aerodynamic loads with development of vortical flow

Wiggen, Stefan and Klein, Christian and Henne, Ulrich and Konrath, Robert and Sachs, Werner and Wrede, Björn and Nuhn, Johannes and Büte, Thomas and Mai, Holger (2017) Motion induced unsteady aerodynamic loads with development of vortical flow. In: 55th AIAA Aerospace Sciences Meeting. 55th AIAA Aerospace Sciences Meeting. AIAA Science and Technology Forum and Exposition, 09.-13. Jan. 2017, Grapevine,. DOI: 10.2514/6.2017-0718

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Official URL: http://dx.doi.org/10.2514/6.2017-0718

Abstract

The development of vortical flow significantly changes the properties of motion induced aerodynamic loads. Tests in the Transonic Wind Tunnel G\"ottingen with a half wing model of a Lambda wing are analyzed. Pitch oscillations were imposed by a hydraulic actuator with amplitudes (0.08°-1.5°) and frequencies (up to 40Hz) relevant for aeroelastic analyses. Unsteady surface pressure and flow field measurements were performed. With increasing angle of attack, a leading edge vortex emerges and moves inboard. The unsteady loads show a strong dependency on the effects of the vortical flow which can be described based on the measurements at constant angles of attack. The effects are lagging the motion. In the rear outboard part of the wing, the unsteady pressures are small, but the amplitude of the motion is high. Hence, a significant amount of energy - force integrated over motion - is transferred from the fluid to the motion. For a free motion or deformation of the wing this would cause a destabilization. A significant effect of the vortical flow is the strong discrepancy between the position where it emerges and is affected and the position, e.g. further outboard, where the flow may generate unsteady, potentially destabilizing, loads

Item URL in elib:https://elib.dlr.de/110785/
Document Type:Conference or Workshop Item (Speech)
Title:Motion induced unsteady aerodynamic loads with development of vortical flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wiggen, Stefanstefan.wiggen (at) dlr.deUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.deUNSPECIFIED
Henne, Ulrichulrich.henne (at) dlr.deUNSPECIFIED
Konrath, Robertrobert.konrath (at) dlr.deUNSPECIFIED
Sachs, Wernerwerner.sachs (at) dlr.deUNSPECIFIED
Wrede, Björnbjoern.wrede (at) dlr.deUNSPECIFIED
Nuhn, Johannesjohannes.nuhn (at) dlr.deUNSPECIFIED
Büte, ThomasThomas.Buete (at) dlr.deUNSPECIFIED
Mai, Holgerholger.mai (at) dlr.deUNSPECIFIED
Date:January 2017
Journal or Publication Title:55th AIAA Aerospace Sciences Meeting
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2017-0718
Status:Published
Keywords:vortex, Lambda wing, unsteady loads, wind tunnel, TWG, pitching oscillation
Event Title:55th AIAA Aerospace Sciences Meeting. AIAA Science and Technology Forum and Exposition
Event Location:Grapevine,
Event Type:international Conference
Event Dates:09.-13. Jan. 2017
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Wiggen, Stefan
Deposited On:01 Feb 2017 11:38
Last Modified:01 Feb 2017 11:38

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