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Particle Image Velocimetry of the underfloor flow of generic high-speed train models in a water towing tank

Jönsson, Mattias and Wagner, Claus and Loose, Sigfried (2014) Particle Image Velocimetry of the underfloor flow of generic high-speed train models in a water towing tank. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 228 (2), pp. 194-209. SAGE Publications. DOI: 10.1177/0954409712470607 ISSN 0954-4097

Full text not available from this repository.

Official URL: http://pif.sagepub.com/content/228/2/194

Abstract

The underfloor flow field of three different 1:50 generic high-speed train models hauled through a water towing tank at a speed of 4 m/s (Reynolds number = 0.24 Mio) over a smooth, rough and a ground with sleepers were measured by means of two component Particle Image Velocimetry. The reference train model consisting of four cars, features inter-car gaps and two bogies per car. These features are removed and all gaps are closed for the smooth train configuration, while the rough train configuration reflects all gaps but no bogies. The lowest underfloor flow velocities and velocity gradients at the ground are observed for the smooth train model on the ground with sleepers. Further the measurements reveal that any additional irregularity of the underbody leads to accelerated flow regions in the otherwise Couette-like flow which increase the possibility of ballast flight. Therefore it is concluded that a smooth underbody can lower the risk of ballast flight. The results obtained for the reference train model are compared to those of a full scale measurement. It is shown that the results of the water towing tank experiments with the down-scaled train model reflect the main characteristics of the underfloor flow of the full scale measurements.

Item URL in elib:https://elib.dlr.de/74429/
Document Type:Article
Additional Information:first published on December 28, 2012
Title:Particle Image Velocimetry of the underfloor flow of generic high-speed train models in a water towing tank
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jönsson, MattiasMattias.Joensson (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Loose, SigfriedSigfried.Loose (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:228
DOI :10.1177/0954409712470607
Page Range:pp. 194-209
Publisher:SAGE Publications
ISSN:0954-4097
Status:Published
Keywords:Train aerodynamics, ballast flight, ballast projection, underfloor aerodynamics, Particle Image Velocimetry
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:24 Apr 2014 15:04
Last Modified:06 Sep 2019 15:23

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