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Secondary instability and transition in three-dimensional boundary layers

Stolte, A. and Bertolotti, F.P. and Koch, W. (1999) Secondary instability and transition in three-dimensional boundary layers. In: GAMM 1998, III, pp. 705-706. GAMM Jahrestagung, Bremen, 06.-09. April 1998. ISBN 0946-8463.

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Abstract

In the highly accelerated three-dimensional flow near the leading edge of a swept wing stationary and travelling crossflow modes are the most prominent disturbances. Near transition onset secondary three-dimensional instabilities of high frequency can be observed in such flows. A model flow on the basis of a DLR swept plate experiment allows a detailed study of transition scenarios triggered by crossflow instabilities, since the favourable pressure gradient over the whole plate inhibits instabilities of Tollmien-Schlichting type. In order to shed some light upon the role of the high-frequency secondary instabilities, the saturation characteristics of crossflow vortices in this model flow are investigated using the parabolised stability equations [1]. In contrast to nonlinear equilibrium solutions [3] of steady crossflow vortices, the PSE results yield different maximal disturbance amplitudes for different initial amplitudes

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Secondary instability and transition in three-dimensional boundary layers
Authors:
AuthorsInstitution or Email of Authors
Stolte, A.UNSPECIFIED
Bertolotti, F.P.UNSPECIFIED
Koch, W.UNSPECIFIED
Date:1999
Journal or Publication Title:GAMM 1998
Volume:III
Page Range:pp. 705-706
Editors:
EditorsEmail
ZAMM, UNSPECIFIED
Series Name:ZAMM - Z. angew. Math. Mech., Vol. 79
ISBN:0946-8463
Status:Published
Keywords:crossflow instability, DLR flat plate experiment, nonlinear mean-flow distortion, secondary instability
Event Title:GAMM Jahrestagung, Bremen, 06.-09. April 1998
Organizer:GAMM
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L TG - Querschnittstechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:26

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