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Excitation of unsteady cross-flow instability modes at scattering of free-stream vortices on surface vibrations

Borodulin, V. I. and Ivanov, A. V. and Kachanov, Y. S. and Mischenko, D. A. and Örlü, R. and Hanifi, A. and Hein, Stefan (2017) Excitation of unsteady cross-flow instability modes at scattering of free-stream vortices on surface vibrations. In: High Energy Processes in Condensed Matter. High Energy Processes in Condensed Matter 2017, 05.-06. Juni 2017, Novosibirsk, Russland.

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Official URL: http://hepcm2017.itam.nsc.ru/en/general_info

Abstract

The results of quantitative experimental study of a mechanism of excitation of unsteady (in general) cross-flow instability modes in a boundary layer of a 35-degree swept wing due to scattering of unsteady free-stream vortices on streamwise localized surface vibrations are presented in this paper. The experiments are performed in the Royal Institute of Technology in Stockholm (Sweden) in the framework of studies ‘A’ of Working Package 1 of project ‘RECEPT’ of the Seventh European Framework Program. The measurements are carried out on a model of a real swept wing of an infinite span at conditions of controlled surface perturbations. Calculations and measurements have shown that at the selected angle of attack of −5°, cross-flow instability dominates in the boundary layer. The base-flow parameters, as well as the parameters of the free-stream and surface perturbations (such as frequencies and range of spanwise wavenumbers) were selected based on calculations, performed for the particular experimental conditions, as well as on preliminary experimental studies of the cross-flow instability. The calculations have shown very good agreement of stability characteristics with the measurements obtained in a broad range of parameters. After deep processing of the experimental data, estimates of values of coefficients of linear flow receptivity to freestream vortices (with vorticity vectors parallel to the wing leading edge) at their scattering on streamwise localized surface vibrations are obtained for the receptivity mechanism responsible for excitation of the cross-flow instability modes. The coefficients are obtained for various relations of the vortex and surface frequencies in a great range of spanwise wavenumbers of the excited cross-flow instability modes.

Item URL in elib:https://elib.dlr.de/112137/
Document Type:Conference or Workshop Item (Speech)
Title:Excitation of unsteady cross-flow instability modes at scattering of free-stream vortices on surface vibrations
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.foi, stockholm, swedenUNSPECIFIED
Hein, StefanStefan.Hein (at) dlr.deUNSPECIFIED
Date:2017
Journal or Publication Title:High Energy Processes in Condensed Matter
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:laminar-turbulent transition, three-dimensional boundary layer, receptivity, EU FP7 project RECEPT
Event Title:High Energy Processes in Condensed Matter 2017
Event Location:Novosibirsk, Russland
Event Type:international Conference
Event Dates:05.-06. Juni 2017
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 - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Hein, Dr.-Ing. Stefan
Deposited On:27 Nov 2017 15:44
Last Modified:27 Feb 2019 12:29

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