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Quantitative study of localized mechanisms of excitation of cross-flow instability modes in a swept-wing boundary layer

Borodulin, V. I. and Ivanov, A. V. and Kachanov, Y. S. and Mischenko, D. A. and Örlü, R. and Hanifi, A. and Hein, S. (2018) Quantitative study of localized mechanisms of excitation of cross-flow instability modes in a swept-wing boundary layer. Journal of Physics: Conference Series, 1129 (1). Institute of Physics (IOP) Publishing. DOI: 10.1088/1742-6596/1129/1/012008 ISSN 1742-6588

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Official URL: https://doi.org/10.1088/1742-6596/1129/1/012008

Abstract

An experimental study of two efficient receptivity mechanisms of excitation of cross-flow (CF) instability modes is carried out in a boundary layer of a real airfoil section of a swept wing due to: (i) action of localized surface vibrations, and (ii) scattering of 2D freestream vortices on them. It is found that the two mechanisms lead to rather efficient excitation of CF-modes both at surface vibration frequency and at combination 'vortex-vibration' frequencies. First estimations of the corresponding localized receptivity coefficients are obtained. Direct comparison of the experimental amplification curves of the excited CF-modes with those calculated based on the linear stability theory (LST) has shown that the experimental data obtained at vibration frequency are in excellent agreement with the LST. At the same time, growth rates of the CF-modes excited at combination frequencies are found to be completely inconsistent with the LST. A possible explanation of this phenomenon via action of a new efficient distributed receptivity mechanism is suggested. This mechanism is associated with scattering of freestream vortices on rather high-amplitude CF-modes excited by surface vibrations.

Item URL in elib:https://elib.dlr.de/121807/
Document Type:Article
Title:Quantitative study of localized mechanisms of excitation of cross-flow instability modes in a swept-wing boundary layer
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, S.UNSPECIFIEDUNSPECIFIED
Date:2018
Journal or Publication Title:Journal of Physics: Conference Series
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:1129
DOI :10.1088/1742-6596/1129/1/012008
Editors:
EditorsEmail
UNSPECIFIEDIOP Publishing Ltd
Publisher:Institute of Physics (IOP) Publishing
ISSN:1742-6588
Status:Published
Keywords:laminar-turbulent transition, receptivity, swept wing, crossflow instability, RECEPT
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:04 Jan 2019 11:45
Last Modified:04 Jan 2019 11:45

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