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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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|
|Journal or Publication Title:||Solid Mechanics and its Applications|
|In ISI Web of Science:||No|
|Page Range:||pp. 115-124|
|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|
|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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