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Propagation of Tollmien Schlichting waves in a wing boundary layer

Seitz, A. and Horstmann, K.H. (2003) Propagation of Tollmien Schlichting waves in a wing boundary layer. In: Recent Results in laminar-turbulent transition, 86. Springer Verlag, Berlin, Heidelberg, New York. DFG Abschluß-Kolloquium Schwerpunkt "Transition", Stuttgart (de), 22.-24.04.2002. ISBN 3-540-40490-2.

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Abstract

So far, very little is known about instability wave propagation in a wing boundary layer in free flight. Therefore, flight tests were performed in order to investigate under conditions of natural excitement Tollmien-Schlichting waves as primary instabilities in transition to turbulence. Measurements were done with a 64 element hot-film array. the array was bonded to a laminar glove on the right hand wing of the flying testbed LFU 205. Amplitudes of wall shear stress fluctuations induced by Tollmien-Schlichting waves were quantified by employing a calibration procedure for hot-film sensors. Analysis of measured data reveals a brodband frequency spectrum of TS-instabilities typical for wave packages, while the spanwise extend of wave trains is comparatively small (in the order of about 3 wavelengths).

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:Propagation of Tollmien Schlichting waves in a wing boundary layer
Authors:
AuthorsInstitution or Email of Authors
Seitz, A.UNSPECIFIED
Horstmann, K.H.UNSPECIFIED
Date:2003
Journal or Publication Title:Recent Results in laminar-turbulent transition
Volume:86
Publisher:Springer Verlag, Berlin, Heidelberg, New York
Series Name:Notes on numerical fluid mechanics and multidisciplinary design.
ISBN:3-540-40490-2
Status:Published
Keywords:Laminar flow, Boundary Layer, Tollmien-Schlichting waves
Event Title:DFG Abschluß-Kolloquium Schwerpunkt "Transition", Stuttgart (de), 22.-24.04.2002
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: Claudia Grant
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:23

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