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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 (2010) Experimental investigation of the flow field underneath a generic high-speed train and the effects of ground and train roughness. Aerodynamics of Heavy Vehicles III: Trucks, Buses and Trains, September 12-17, 2010, Potsdam, Germany.

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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 speed of 4 m/s are presented. Principally, the three different generic high-speed train configurations are based on the same 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 high-speed 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 the GHSTC with full scale measurements, it was found that the same flow 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 highspeed 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 beginning of the second car, in agreement to the full scale measurements. For the three train configurations three different flow fields underneath the train were obtained. The lowest velocities were found for the smooth GHSTC and the highest for the rough GHSTC. Further, the ground roughness changed the flow fields underneath the different train configurations.

Document Type:Conference or Workshop Item (Speech, Paper)
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 Authors
Jönsson, Mattiasmattias.joensson@dlr.de
Loose, Sigfriedsigfried.loose@dlr.de
Date:2010
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Conference Proceedings
Status:Published
Keywords:Ballast projection, Train aerodynamics, Heavy vehicles, Underbody flow
Event Title:Aerodynamics of Heavy Vehicles III: Trucks, Buses and Trains
Event Location:Potsdam, Germany
Event Type:international Conference
Event Dates:September 12-17, 2010
Organizer:Engineering Conferences International
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 13:15
Last Modified:01 Dec 2010 13:15

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