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Characterization of Transonic Buffet on a Swept Wing by Means of Cryogenic PIV

Schauerte, Christopher and Bosbach, Johannes and Konrath, Robert and Geisler, Reinhard and Philipp, Florian and Schreyer, Anne-Marie (2023) Characterization of Transonic Buffet on a Swept Wing by Means of Cryogenic PIV. In: Deutscher Luft- und Raumfahrtkongress 2022, Dresden, pp. 1-10. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2023. Deutscher Luft- und Raumfahrtkongress 2022, 27.-29. Sept. 2022, Dresden; Deutschland. doi: 10.25967/570369.

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Official URL: https://doi.org/10.25967/570369


Transonic buffet is one of the major factors in the aerodynamic design of modern transport aircraft. The phenomenon is encountered on the suction side of airfoils in transonic flow. It is associated with low-frequency shock oscillations coupled with a periodic modulation of the large-scale shock-induced flow separation. Buffet can induce detrimental structural vibrations (buffeting) and thus strictly limits the flight envelope. Various aspects of the phenomenon remain not fully understood, in particular where realistic 3D aircraft wings and high, flight-realistic Reynolds numbers are concerned. In the present study, we characterize transonic buffet on a swept wing at a Mach number of Ma=0.84 and a high Reynolds number of Re=12.9 Mio (based on the mean aerodynamic chord), thus fostering a comprehensive understanding of 3D buffet near the limits of the flight envelope. A full-span model of the XRF1 airplane geometry designed by Airbus was investigated in cryogenic conditions (T0=180 K) in the European Transonic Wind Tunnel (ETW), Cologne, Germany. An indepth discussion of the velocity field measured by means of cryogenic particle-image velocimetry (cryoPIV) is presented. Two consecutive and spatially linked fields of view on the wing and in its wake allow to capture the flow physics in a large region simultaneously. The nature of the unsteady flow topology induced by an oscillating shock wave at established buffet conditions is explored in terms of phase-averaged velocity maps. A thorough analysis of the mean and turbulent velocity field is complemented by a statistical evaluation of turbulent quantities. High-speed PIV sequences in the wing wake are explored to capture the spectral signature induced by transonic wing buffet and to assess the fluctuations imposed on the wing wake. Inherent fluctuations continue to exist as they are convected downstream, and maintain a spectral composition typical of 3D buffet. Consequently, buffet severely affects also the downstream flow conditions.

Item URL in elib:https://elib.dlr.de/193373/
Document Type:Conference or Workshop Item (Speech)
Additional Information:urn:nbn:de:101:1-2023011312114258411815; Download - Bitte beachten Sie die Nutzungsbedingungen dieses Dokuments: Copyright protected
Title:Characterization of Transonic Buffet on a Swept Wing by Means of Cryogenic PIV
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bosbach, JohannesUNSPECIFIEDhttps://orcid.org/0000-0002-1531-127XUNSPECIFIED
Geisler, ReinhardUNSPECIFIEDhttps://orcid.org/0009-0006-8838-3713UNSPECIFIED
Schreyer, Anne-MarieRWTH Aachenhttps://orcid.org/0000-0001-7845-1969UNSPECIFIED
Date:13 January 2023
Journal or Publication Title:Deutscher Luft- und Raumfahrtkongress 2022, Dresden
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-10
EditorsEmailEditor's ORCID iDORCID Put Code
UNSPECIFIEDDeutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.UNSPECIFIEDUNSPECIFIED
Publisher:Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2023
Series Name:Conference Paper
Keywords:Transsonisches Buffet, Particle Image Velocimetry
Event Title:Deutscher Luft- und Raumfahrtkongress 2022
Event Location:Dresden; Deutschland
Event Type:national Conference
Event Dates:27.-29. Sept. 2022
Organizer:Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:23 Mar 2023 16:42
Last Modified:23 Mar 2023 16:42

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