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In-Flight Investigations of Tollmien-Schlichting Waves

Seitz, Arne and Horstmann, Karl-Heinz (2006) In-Flight Investigations of Tollmien-Schlichting Waves. In: Solid Mechanics and its Applications Springer. pp. 115-124. ISBN 1-4020-4149-7.

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Abstract

Flight tests were performed in order to learn more about the technically important case of naturally occurring Tollmien-Schlichting waves in boundary layer transition. A multi-element hot-film array, placed on the right hand wing of the flying test bed LFU-205, was used to sense skin friction fluctuations provoked by Tollmien-Schlichting disturbances propagating in the laminar boundary layer. Fourier analysis in time and space of the experimental data revealed that a broadband spectrum of 2d and 3d Tollmien-Schlichting waves is involved in the signals, typical for wave packets. Occurrence of these wave packets happens stochastically and it was found that they vary in intensity as well as in their spanwise extent. Examination of signal time histories from sensors distributed in chordwise direction showed that breakdown to turbulence, indicated by spikes in the signal, starts from within the wave packets with the strongest amplitudes.

Document Type:Contribution to a Collection
Title:In-Flight Investigations of Tollmien-Schlichting Waves
Authors:
AuthorsInstitution or Email of Authors
Seitz, ArneUNSPECIFIED
Horstmann, Karl-HeinzUNSPECIFIED
Date:2006
Journal or Publication Title:Solid Mechanics and its Applications
Refereed publication:Yes
In ISI Web of Science:No
Volume:129
Page Range:pp. 115-124
Editors:
EditorsEmail
Meier, G.E.A.UNSPECIFIED
Sreenivasan, K.R.UNSPECIFIED
Heinemann, H.-J.UNSPECIFIED
Publisher:Springer
ISBN:1-4020-4149-7
Status:Published
Keywords:boundary layer, laminar, turbulent, natural transition, Tollmien-Schlichting wave, flight test, hot-film, wave packet
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: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Configuration Design
Deposited By: Dr.-Ing. Arne Seitz
Deposited On:10 Aug 2007
Last Modified:27 Apr 2009 14:13

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