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Experimental Investigation of the Flow Field Underneath a Generic High-Speed Train and the Effects of Ground and Train Roughness

Jönsson, Mattias and Loose, Sigfried (2015) Experimental Investigation of the Flow Field Underneath a Generic High-Speed Train and the Effects of Ground and Train Roughness. In: The Aerodynamics of Heavy Vehicles III: Trucks, Buses and Trains Lecture Notes in Applied and Computational Mechanics, 79 (1). Springer International Publishing. pp. 21-36. ISBN 978-3-319-20121-4. ISSN 1613-7736

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Official URL: http://www.springer.com/us/book/9783319201214

Abstract

Results obtained from two component Particle Image Velocimetry (PIV) measurements on three different 1:50 generic high-speed train configurations hauled through a water towing tank over a smooth (Plexiglas) and a rough (grinding belt) ground at a specd of 4 m/s are presented. Principally, the three different generic highspeed train configurations arc based on the samc model (front car, two cars and tail car). The smooth generic high-speed train configuration (smooth GHSTC) reflects no bogies and covers the bogie cut outs and inter car gaps, the rough generic highspeed train configuration (rough GHSTC) is obtained by removing the bogies and leave the bogie cut outs and inter car gaps open and for the generic high-speed train configuration (GHSTC) the bogies are not removed but the inter car gaps are left open. A PIV set-up was chosen that the light sheet defines a vertical plane (XZ) between the ground and the train in the symmetry line of the train. Comparing the PIV results obtained for thc GHSTC with full scale measuremcnts, it was found that the same ftow structures develop in the vicinity of the head and the tail of the train. But, the measured underfloor U-velocity of the downscaled model measurements did not reach the same value as those measured for the full scale high-speed train. The reason which is ascribed to the better aerodynamic underframe of the train model in the downscaled model measurements. The flow field underneath the GHSTC was fully developed at the bcginning of the second car, in agreement to the full scale measurcments. For the three train configurations three different flow fields underneath the train were obtained. The lowest vclocities were found for the smooth GHSTC and the highest for thc rough GHSTC. Further, the ground roughness changed the flow fields underneath the different train configurations.

Item URL in elib:https://elib.dlr.de/98913/
Document Type:Contribution to a Collection
Additional Information:Proceedings of "The Aerodynamics of Heavy Vehicles III: Trucks, Buses and Trains", held September, 2010 in Potsdam, Germany, eBook ISBN: 978-3-319-20122-1
Title:Experimental Investigation of the Flow Field Underneath a Generic High-Speed Train and the Effects of Ground and Train Roughness
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jönsson, MattiasMattias.Joensson (at) dlr.deUNSPECIFIED
Loose, SigfriedSigfried.Loose (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:The Aerodynamics of Heavy Vehicles III: Trucks, Buses and Trains
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:79
DOI :10.1007/978-3-319-20122-1_2
Page Range:pp. 21-36
Editors:
EditorsEmail
Dillmann, AndreasDLR
Orellano, AlexanderBombardier
Publisher:Springer International Publishing
Series Name:Lecture Notes in Applied and Computational Mechanics
ISSN:1613-7736
ISBN:978-3-319-20121-4
Status:Published
Keywords:Water-towing tank, train aerodynamics, ballast projection, Particle Image Velocimetry (PIV), High-Speed Train
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 - Next Generation Train III (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:27 Nov 2015 16:07
Last Modified:10 May 2016 23:33

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