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Experimental and theoretical study of swept-wing boundary-layer instabilities: Unsteady crossflow instability

Borodulin, V. I. and Ivanov, A. V. and Kachanov, Y. S. and Mischenko, D. A. and Örlü, R. and Hanifi, A. and Hein, Stefan (2019) Experimental and theoretical study of swept-wing boundary-layer instabilities: Unsteady crossflow instability. Physics of Fluids, 31 (064101), pp. 1-18. American Institute of Physics (AIP). DOI: 10.1063/1.5094609 ISSN 1070-6631

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Official URL: https://doi.org/10.1063/1.5094609

Abstract

Extensive combined experimental and theoretical investigations of the linear evolution of unsteady (in general) Cross-Flow (CF) and threedimensional (3D) Tollmien-Schlichting (TS) instability modes of 3D boundary layers developing on a swept airfoil section have been carried out. CF-instability characteristics are investigated in detail at an angle of attack of −5○ when this kind of instability dominates in the laminarturbulent transition process, while the 3D TS-instability characteristics are studied at an angle of attack of +1.5○ when this kind of instability is predominant in the transition process. All experimental results are deeply processed and compared with results of calculations based on several theoretical approaches. For the first time, very good quantitative agreement of all measured and calculated stability characteristics of swept-wing boundary layers is achieved both for unsteady CF- and 3D TS-instability modes for the case of a boundary layer developing on a real swept airfoil. The first part of the present study (this paper) is devoted to the description of the case of CF-dominated transition, while the TS-dominated case will be described in detail in a subsequent second part of this investigation.

Item URL in elib:https://elib.dlr.de/126673/
Document Type:Article
Title:Experimental and theoretical study of swept-wing boundary-layer instabilities: Unsteady crossflow instability
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Borodulin, V. I.Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, RussiaUNSPECIFIED
Ivanov, A. V.Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, RussiaUNSPECIFIED
Kachanov, Y. S.Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, RussiaUNSPECIFIED
Mischenko, D. A.Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, RussiaUNSPECIFIED
Örlü, R.KTH, Stockholm, SchwedenUNSPECIFIED
Hanifi, A.KTH, Stockholm, SchwedenUNSPECIFIED
Hein, Stefanstefan.hein (at) dlr.deUNSPECIFIED
Date:11 June 2019
Journal or Publication Title:Physics of Fluids
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:31
DOI :10.1063/1.5094609
Page Range:pp. 1-18
Editors:
EditorsEmail
UNSPECIFIEDAIP
Publisher:American Institute of Physics (AIP)
ISSN:1070-6631
Status:Published
Keywords:laminar-turbulent transition, swept wing, hot-wire anemometry, local and nonlocal linear instability analysis, LST, PSE
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 for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Hein, Dr.-Ing. Stefan
Deposited On:13 Jun 2019 10:14
Last Modified:13 Jun 2019 12:32

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