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Surface pressure measurements at a Lambda wing at steady and pitching angle of attack at vortex dominated flow including transonic effects

Wiggen, Stefan and Klein, Christian and Henne, Ulrich and Sachs, Werner and Nuhn, Johannes (2015) Surface pressure measurements at a Lambda wing at steady and pitching angle of attack at vortex dominated flow including transonic effects. In: 5th CEAS Air & Space Conference (014), pp. 1-13. 5th CEAS Air & Space Conference 2015, 7. - 9. Sept. 2015, Delft, The Netherlands.

Full text not available from this repository.

Official URL: http://www.ceas2015.org/

Abstract

In the Transonic Wind tunnel Göttingen, different test campaigns were performed with an oscillating lambda wing to study the unsteady pressure distributions at vortical flow conditions including transonic influences. The free stream Mach number was varied between 0.3 and 0.7. Small pitching amplitudes of 0.08° - 0.4° at excitation frequencies up to 40 Hz were used. In this paper, particularly the data of unsteady Pressure Sensitive Paint measurements and unsteady pressure sensors are analyzed. With increasing angle of attack, at first a suction peak and a shock occur near the leading edge, then a shock induced separation triggers the development of a vortex at the main wing. The unsteady pressures show the following: For lower angles of attack, the shock is dominant. For higher angles of attack, the effect of the vortex is of similar magnitude and becomes dominant. The shock exhibits an inverse motion with increasing angle of attack. For high angles of attack, beyond the maximum lift, the unsteady pressure distributions and the lift exhibit a significant phase lag, already at very low oscillation frequencies.

Item URL in elib:https://elib.dlr.de/98694/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Book of Abstracts, Proceedings on USB-stick
Title:Surface pressure measurements at a Lambda wing at steady and pitching angle of attack at vortex dominated flow including transonic effects
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
Sachs, Wernerwerner.sachs (at) dlr.deUNSPECIFIED
Nuhn, Johannesjohannes.nuhn (at) dlr.deUNSPECIFIED
Date:September 2015
Journal or Publication Title:5th CEAS Air & Space Conference
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-13
Series Name:Conference Proceedings online
Status:Published
Keywords:vortex, transonic, unsteady pressure, Lambda wing
Event Title:5th CEAS Air & Space Conference 2015
Event Location:Delft, The Netherlands
Event Type:international Conference
Event Dates:7. - 9. Sept. 2015
Organizer:CEAS
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 - Military Technologies
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Wiggen, Stefan
Deposited On:09 Nov 2015 14:21
Last Modified:10 May 2016 23:32

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