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Spatially and Temporally Resolved Visualization of Turbulent Spots in Blasius Boundary Layer Transition

Lemarechal, Jonathan and Klein, Christian and Henne, Ulrich and Puckert, Dominik K. and Rist, Ulrich (2018) Spatially and Temporally Resolved Visualization of Turbulent Spots in Blasius Boundary Layer Transition. In: 18th International Symposium on Flow Visualization (ISFV18) (020m), pp. 1-17. ETH Zurich. 18th International Symposium on Flow Visualization (ISFV18), 26. - 29. June 2018, Zürich, Schwitzerland. DOI: 10.3929/ethz-b-000279144

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Official URL: https://doi.org/10.3929/ethz-b-000279144

Abstract

The temperature-sensitive paint (TSP) method is applied in a transitional flat-plate boundary layer flow in a low-speed laminar water channel. The long measuring times in this facility lead to strong requirements for the homogeneity of the heat flux between surface and flow, which is necessary for the visualization technique. Therefore, a special element to apply the visualization technique, which can be placed flexibly in the facility, was developed. The requirements concerning the homogeneity of the heat flux were fulfilled with a heating based on a current-carrying layer of carbon fiber. The TSP method was used to investigate the turbulent spots in the transitional region. In the present experiment turbulent spots are generated by the laminar-turbulent transition process. The transitional flow in the experiment was threedimensional because of flow control devices placed near the leading edge of the flat plate. The visualization of the occurring turbulent spots was time resolved and capable of resolving the flow structures of the turbulent spot close to the wall, i.e. inrushes caused by sweeps, hairpin vortices and streaks.

Item URL in elib:https://elib.dlr.de/124975/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Paper DOI: 10.3929/ethz-b-000279144
Title:Spatially and Temporally Resolved Visualization of Turbulent Spots in Blasius Boundary Layer Transition
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lemarechal, JonathanJonathan.Lemarechal (at) dlr.dehttps://orcid.org/0000-0002-3333-2664
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922
Henne, Ulrichulrich.henne (at) dlr.deUNSPECIFIED
Puckert, Dominik K.Institut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIED
Rist, UlrichInstitut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIED
Date:26 June 2018
Journal or Publication Title:18th International Symposium on Flow Visualization (ISFV18)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.3929/ethz-b-000279144
Page Range:pp. 1-17
Editors:
EditorsEmail
Rösgen, ThomasETH Zürich, Institute of Fluid Dynamics
Publisher:ETH Zurich
Series Name:Conference Proceedings online
Status:Published
Keywords:Temperature-Sensitive Paint, TSP, waterTSP, Laminar-Turbulent Transition, Turbulent Spot
Event Title:18th International Symposium on Flow Visualization (ISFV18)
Event Location:Zürich, Schwitzerland
Event Type:international Conference
Event Dates:26. - 29. June 2018
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:09 Jan 2019 12:40
Last Modified:09 Jan 2019 12:40

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