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Utilizing a Laser Light Sheet Technique in a Boundary-Layer Flow to Study Different Transition Types

Wiegel, M. and Fischer, M. (1995) Utilizing a Laser Light Sheet Technique in a Boundary-Layer Flow to Study Different Transition Types. In: 7th International Symposium on Flow Visualization, pp. 432-437. 7th International Symposium on Flow Visualization, Seattle, Washington, USA, Sept. 11-14, 1995.

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Abstract

A non-intrusive flow visualization technique for investigations in a boundary layer in air utilizing a laser-light sheet technique with adequate seeding is presented. The non-intrusive homogeneous seeding of the flow was realized by feeding the tracer particles into the flow with a seeding-rake located upstream of the grid and screens of the wind tunnel. We could also present a sophisticated excitation device which provided reproducible and constant initial conditions of the boundary-layer instabilities. Selecting different combinationsof the excitation signals, it was possible to investigate besides thefundamental and subharmonic transition the development of a single oblique wave and the oblique transition. This excitation together with the stated visualization technique enabled us to investigate effectively different transition types. Another important feature of this set-up is the phase-locked recording against the excitation signal facilitating the recording at a chosen phase with respect.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1995,
Title:Utilizing a Laser Light Sheet Technique in a Boundary-Layer Flow to Study Different Transition Types
Authors:
AuthorsInstitution or Email of Authors
Wiegel, M.UNSPECIFIED
Fischer, M.UNSPECIFIED
Date:1995
Journal or Publication Title:7th International Symposium on Flow Visualization
Page Range:pp. 432-437
Status:Published
Keywords:Non-Intrusive Flow Visualization, Laser Light Sheet, Boundary-Layer Flow
Event Title:7th International Symposium on Flow Visualization, Seattle, Washington, USA, Sept. 11-14, 1995
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 > 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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