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Particle Image Velocimetry of the underbody flow of generic high-speed trains

Jönsson, Mattias and Wagner, Claus and Loose, Sigfried (2010) Particle Image Velocimetry of the underbody flow of generic high-speed trains. 17. DGLR-Fach-Symposium der STAB, 9. – 10. November 2010, Berlin, Deutschland.

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Official URL: http://www.dlr.de/as/desktopdefault.aspx/tabid-652/1104_read-1678/

Abstract

Two component Particle Image Velocimetry (PIV) of the underbody flow of three different 1:50 generic high-speed train configurations hauled through a water towing tank over a smooth and a rough ground at a speed of 4 m/s (Re = 0.24 Mio) have been performed. The reference train model (RTM) consisting of 4 cars, features bogies and inter car gaps. All this features are removed for the clean train configuration (CTM), while the open train configuration (OTM) reflects all gaps but no bogies. The lowest underbody flow velocities were obtained for the CTM on the rough ground. It was found that any additional irregularity of the underfloor leads to accelerated flow regions which increase the possibility of ballast projection. The highest velocity gradients and thus aerodynamic loads on the ballast stones were obtained in the nearly fully-developed Couette-like flow underneath the third car of the RTM. Therefore it is concluded that a smooth underbody can lower the risk of ballast projection

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Particle Image Velocimetry of the underbody flow of generic high-speed trains
Authors:
AuthorsInstitution or Email of Authors
Jönsson, Mattiasmattias.joensson@dlr.de
Wagner, Clausclaus.wagner@dlr.de
Loose, Sigfriedsigfried.loose@dlr.de
Date:2010
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:STAB-Mitteilung
Status:Published
Keywords:Ballast projection, Train aerodynamics, Heavy vehicles, Underbody flow
Event Title:17. DGLR-Fach-Symposium der STAB
Event Location:Berlin, Deutschland
Event Type:national Conference
Event Dates:9. – 10. November 2010
Organizer:STAB, DGLR und TU Berlin
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Transport
HGF - Program Themes:V VR - Verkehrsforschung (old)
DLR - Research area:Transport
DLR - Program:V VR - Verkehrsforschung
DLR - Research theme (Project):V - Fahrzeugaerodynamik (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Mattias Jönsson
Deposited On:01 Dec 2010 10:35
Last Modified:01 Dec 2010 10:35

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