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Unsteady surface pressures measured at a pitching Lambda wing with vortex dominated flow and transonic effects

Wiggen, Stefan and Henne, Ulrich and Klein, Christian and Nuhn, Johannes and Sachs, Werner (2018) Unsteady surface pressures measured at a pitching Lambda wing with vortex dominated flow and transonic effects. CEAS Aeronautical Journal, 9, pp. 417-427. Springer. doi: 10.1007/s13272-018-0293-4. ISSN 1869-5590.

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Official URL: https://doi.org/10.1007/s13272-018-0293-4


In the Transonic Wind Tunnel Goettingen, pitch oscillations were performed with a Lambda wing to study unsteady pressure distributions of vortex dominated flow including transonic effects. The free stream Mach number was varied between 0.3 and 0.7. Small pitching amplitudes of 0.08–0.4 deg 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, 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: for lower angles of attack, the transonic influences are dominant. For higher angles of attack, the influence of the vortex becomes of similar Magnitude and dominates the behavior of the pressure variations. The shock exhibits, with increasing angle of attack, an inverse motion. For angles of attack beyond the maximum lift, the unsteady pressure distributions and the lift show a significant phase lag, already at very low oscillation frequencies. Compared to subsonic cases, the supersonic region shifts the vortex induced pressures downstream.

Item URL in elib:https://elib.dlr.de/119642/
Document Type:Article
Title:Unsteady surface pressures measured at a pitching Lambda wing with vortex dominated flow and transonic effects
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wiggen, StefanStefan.Wiggen (at) dlr.deUNSPECIFIED
Henne, Ulrichulrich.henne (at) dlr.deUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922
Nuhn, Johannesjohannes.nuhn (at) dlr.deUNSPECIFIED
Sachs, Wernerwerner.sachs (at) dlr.deUNSPECIFIED
Date:9 March 2018
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/s13272-018-0293-4
Page Range:pp. 417-427
EditorsEmailEditor's ORCID iD
Keywords:vortex, transonic, pitch oscillation, lambda wing, unsteady pressure
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 (old)
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:08 Oct 2018 14:02
Last Modified:05 Nov 2020 22:22

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