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Underfloor flow measurements of a 1:50 generic high-speed train-set by means of high-speed PIV in a water towing tank

Jönsson, Mattias and Wagner, Claus and Loose, Sigfried (2013) Underfloor flow measurements of a 1:50 generic high-speed train-set by means of high-speed PIV in a water towing tank. 10th World Congress on Railway Research (WCRR), 25. - 28. Nov. 2013, Sydney, Australien.

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Official URL: http://www.wcrr2013.org/


Two-component high-speed particle image velocimetry measurements of the underfloor flow field in the rail symmetry-line of three different 1:50 high-speed train configurations hauled over a smooth ground, a rough ground and a ground with sleepers were conducted in a water towing tank at a train speed of 4 m/s (Reynolds number=0.25•106). The high-speed train configurations were realised by changing the underfloor roughness of the 4-unit generic high-speed train model (two end-cars and two mid-cars). The reference train model represents a conventional non-articulated high-speed train with inter-car gaps and two bogies per car. A completely smooth underbelly was achieved by removing the bogies and covering all the gaps as the third train configuration without bogies and all gaps left open reflects a rough train underbelly. The results revealed that any underfloor irregularities such as bogies, bogie housings, inter-car gaps or cavities accelerates the underfloor flow concluding that a smooth train underfloor decreases the chance of ballast flight. Furthermore, the risk of ballast flight is lower for a trackbed with monoblock sleepers and a lowered ballast level than for a trackbed with bi-block sleepers.

Item URL in elib:https://elib.dlr.de/86996/
Document Type:Conference or Workshop Item (Speech)
Title:Underfloor flow measurements of a 1:50 generic high-speed train-set by means of high-speed PIV in a water towing tank
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-6
Series Name:Conference Proceedings on USB-Stick
Keywords:Underfloor aerodynamics, ballast flight, ballast projection, ballast lifting, high-speed trains, vehicle aerodynamics, particle image velocimetry, PIV
Event Title:10th World Congress on Railway Research (WCRR)
Event Location:Sydney, Australien
Event Type:international Conference
Event Dates:25. - 28. Nov. 2013
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:06 Jan 2014 09:23
Last Modified:08 May 2014 23:20

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