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Motion induced unsteady aerodynamic loads with development of vortical flow

Wiggen, Stefan and Mai, Holger and Nuhn, Johannes and Büte, Thomas and Klein, Christian and Henne, Ulrich and Sachs, Werner and Konrath, Robert and Wrede, Björn (2017) Motion induced unsteady aerodynamic loads with development of vortical flow. Journal of Aircraft. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.C034308 ISSN 0021-8669

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The development of vortical flow strongly changes the properties of motion-induced aerodynamic loads. Tests were performed in the Transonic Wind Tunnel Göttingen with a half-wing model of a lambda wing. A hydraulic actuator imposed pitch oscillations with amplitudes and frequencies relevant for aeroelastic analyses. Unsteady surface-pressure and flowfield 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. For the pitching cases, 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 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/114727/
Document Type:Article
Title:Motion induced unsteady aerodynamic loads with development of vortical flow
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wiggen, Stefanstefan.wiggen (at) dlr.deUNSPECIFIED
Mai, HolgerHolger.Mai (at) dlr.deUNSPECIFIED
Nuhn, Johannesjohannes.nuhn (at) dlr.deUNSPECIFIED
Büte, Thomasthomas.buete (at) dlr.deUNSPECIFIED
Klein, ChristianChristian.Klein (at) dlr.deUNSPECIFIED
Henne, Ulrichulrich.henne (at) dlr.deUNSPECIFIED
Sachs, Wernerwerner.sachs (at) dlr.deUNSPECIFIED
Konrath, RobertRobert.Konrath (at) dlr.deUNSPECIFIED
Wrede, Björnbjoern.wrede (at) dlr.deUNSPECIFIED
Date:6 September 2017
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.C034308
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Lambda wing, unsteady aerodynamics, vortex flow
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 for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Mai, Holger
Deposited On:27 Oct 2017 15:19
Last Modified:08 Mar 2018 18:41

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