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Experimental Assessment of Wing Lower Surface Buffet Effects Induced by the Installation of a UHBR Nacelle

Spinner, Sebastian and Rudnik, Ralf (2022) Experimental Assessment of Wing Lower Surface Buffet Effects Induced by the Installation of a UHBR Nacelle. CEAS Aeronautical Journal, pp. 1-11. Springer. doi: 10.1007/s13272-022-00632-z. ISSN 1869-5590.

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Official URL: https://link.springer.com/article/10.1007/s13272-022-00632-z


The installation of large bypass ratio engines on classical under wing configurations may lead to shock/boundary layer interaction on the wing lower surface, limiting the flight envelope in a similar way to classical buffet occurring on the wing suction side at high incidences in transonic flight. In this study, buffet effects on the lower surface of the wing induced by the installation of a Ultra-High-Bypass-Ratio through flow nacelle are assessed by means of wind tunnel testing. Unsteady pressure sensitive paint measurements were used to assess the pressure field on the wing with high temporal and spatial resolution. Strong unsteady shock motion associated with shock induced separation was found on the wing lower surface for various combinations of Mach number, Reynolds number and angle of attack. The wing lower surface buffet effects are found to increase with reducing angle of attack and are present over a wide range of Reynolds numbers. Preliminary spectral analysis suggests an upper limit for the buffet frequency at a Strouhal number of about 0.4.

Item URL in elib:https://elib.dlr.de/191776/
Document Type:Article
Title:Experimental Assessment of Wing Lower Surface Buffet Effects Induced by the Installation of a UHBR Nacelle
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Spinner, SebastianUNSPECIFIEDhttps://orcid.org/0000-0002-3661-6814UNSPECIFIED
Date:22 December 2022
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-11
EditorsEmailEditor's ORCID iDORCID Put Code
Series Name:CEAS Aeronautical Journal
Keywords:Aerodynamics, Transonic Flow, Buffet, Engine Integration
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Future Engines and Engine Integration
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Spinner, Sebastian
Deposited On:10 Feb 2023 11:03
Last Modified:10 Feb 2023 11:03

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