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Experimental Investigation of Topological Changes in the Flow Field around High-Speed Trains with respect to Reynolds Number Scaling Effects

Fey, Uwe and Haff, Johannes and Jönsson, Mattias and Loose, Sigfried and Wagner, Claus (2014) Experimental Investigation of Topological Changes in the Flow Field around High-Speed Trains with respect to Reynolds Number Scaling Effects. Civil-Comp Press, Stirlingshire, UK. The Second International Conference on Railway Technology: Research, Development and Maintenance, 09. - 11. Apr. 2014, Ajaccio, Korsika, France.

Full text not available from this repository.

Official URL: http://www.ctresources.info/ccp/paper.html?id=7682

Abstract

Temperature-sensitive paint and oil-film flow visualization techniques are used to measure and visualize the near-wall flow field of high-speed train models subject to cross wind flow in a wind tunnel. An ICE3 and a NGT2 train model (next generation train) are investigated with respect to laminar-turbulent boundary layer transition and flow separation. Reynolds numbers in the range 0.20 <= Re <= 0.50x106 are realized, and the scaling of flow structures for different Reynolds numbers and yaw angles of the model is studied. The specific flow topology is correlated with force and moment coefficients, which are measured with a strain gauge balance. It is shown, that in the described Re-range laminar flow exists to an extent, which is not to be expected on a real train. Laminar-turbulent transition and laminar separation bubbles are present and their location and size depend on model geometry, Reynolds number and yaw angle. The Reynolds number scaling of the separation bubble is analysed in detail and an optimized transition tripping method is proposed to control the flow separation, leading to considerably less Re-dependency of the force and moment coefficients in the range 0.30 <= Re <= 0.50x106 and a better agreement with benchmark data given for higher Reynolds numbers.

Item URL in elib:https://elib.dlr.de/89215/
Document Type:Conference or Workshop Item (Speech)
Additional Information:doi: 10.4203/ccp.104.32
Title:Experimental Investigation of Topological Changes in the Flow Field around High-Speed Trains with respect to Reynolds Number Scaling Effects
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fey, Uweuwe.fey (at) dlr.deUNSPECIFIED
Haff, JohannesJohannes.Haff (at) dlr.deUNSPECIFIED
Jönsson, Mattiasmattias.joensson (at) dlr.deUNSPECIFIED
Loose, SigfriedSigfried.Loose (at) dlr.deUNSPECIFIED
Wagner, Clausclaus.wagner (at) dlr.deUNSPECIFIED
Date:2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-20
Editors:
EditorsEmail
Pombo, J.UNSPECIFIED
Publisher:Civil-Comp Press, Stirlingshire, UK
Series Name:Conference Proceedings on USB-Stick, Civil Comp Proceedings
Status:Published
Keywords:high-speed train, cross wind, temperature sensitive paint, laminar-turbulent transition, Reynolds number scaling, laminar separation bubble
Event Title:The Second International Conference on Railway Technology: Research, Development and Maintenance
Event Location:Ajaccio, Korsika, France
Event Type:international Conference
Event Dates:09. - 11. Apr. 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Project Next Generation Train II (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:10 Jun 2014 16:50
Last Modified:20 Oct 2014 13:58

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