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Investigation on artificially forced instabilitaeten in a two-dimensional laminar boundary layer by means of Particle Image Velocimetry

Fischer, M. (1994) Investigation on artificially forced instabilitaeten in a two-dimensional laminar boundary layer by means of Particle Image Velocimetry. In: Untersuchung hinsichtlich angeregter Instabilitaeten in einer zweidimensionalen laminaren Grenzschichtstroemung mit Hilfe der Particle Image Velocimetry. Liepmann-Ludwieg-Seminar, Pasadena/USA 12.06.-18.06.1994.

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Abstract

Artificially forced instabilities are studied in the region of linear amplificationby hot-wire measurements and stability calculations. Growth-rates, phase-velocities and perturbation- profiles are investigated experimentally and show a very good agreement with theoretical data. An arrangement for artifical excitation provides the possibility to generate the fundamental and the subharmonic type as well. For the study of boundary layer instabilities a new measurement technique, the Particle Image Velocimetry (PIV), is used in the transition region. The good agreement of the PIV results with data obtained by hot-wire measurements and calculations demonstrates for the first time the applicability of PIV for the investigation of boundary layer instabilities. Furthermore the PIV results show for a constant excitation level, that for the subharmonic type the transition process takes place at lower Reynolds numbers than for the fundamental type. Visualization pictures are obtained in the transition region by utilizing a laser light sheet method.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=1994,
Title:Investigation on artificially forced instabilitaeten in a two-dimensional laminar boundary layer by means of Particle Image Velocimetry
Authors:
AuthorsInstitution or Email of Authors
Fischer, M.UNSPECIFIED
Date:1994
Journal or Publication Title:Untersuchung hinsichtlich angeregter Instabilitaeten in einer zweidimensionalen laminaren Grenzschichtstroemung mit Hilfe der Particle Image Velocimetry
Status:Published
Keywords:Boundary layer instabilities, laminar-turbulent transition, fundamental and subharmonic type, artificial excitation, Particle Image Velocitetry, flow visualization
Event Title:Liepmann-Ludwieg-Seminar, Pasadena/USA 12.06.-18.06.1994
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
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 > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:08

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