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Experimental Study of Unsteady Flow Structures in the Wake of a Train Model

Buhr, Alexander and Henning, Arne and Ehrenfried, Klaus (2016) Experimental Study of Unsteady Flow Structures in the Wake of a Train Model. The Third International Conference on Railway Technology: Research, Development and Maintenance, 2016-04-05 - 2016-04-08, Cagliari, Sardinia, Italy. doi: 10.4203/ccp.110.41. ISSN 1759-3433.

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Official URL: http://www.ctresources.info/ccp/paper.html?id=8932


Trackside induced airflow velocities are an important criterion for the design of trains. The maximum velocities are typically observed in the train wake and are caused by larger turbulent flow structures. The wake flow depends not only on the geometry of the train’s tail but also on the boundary layer. Due to the limited model size and different Reynolds numbers in model experiments, the wake flow may not be comparable to real trains. The idea is to control the thickness of the boundary layer using roughness elements independently from the model speed and lengths. High-speed particle image velocimetry is used to measure the flow velocities in a plane parallel to the ground at two different heights. As expected, the measured velocities vary greatly between the individual runs. Conditional sampling is used to analyze the size and dynamics of the flow fields at the time of maximum velocity. The results show, that the roughness elements in this setup affect the boundary layer and the flow structure at the lower height by increasing the average and maximum velocity. It remains to investigate, if an applicable setup of roughness elements can be found to create a realistic wake flow compared to real trains.

Item URL in elib:https://elib.dlr.de/98494/
Document Type:Conference or Workshop Item (Speech)
Additional Information:The conference proceedings are published by Civil-Comp Press and Saxe-Coburg Publications and will be available on the first day of the conference.
Title:Experimental Study of Unsteady Flow Structures in the Wake of a Train Model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Buhr, AlexanderUNSPECIFIEDhttps://orcid.org/0000-0002-6805-2531UNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-19
Series Name:Conference Proceedings
Keywords:slipstream, flow structures, double-deck train model, roughness elements, wake turbulence, conditional sampling, high-speed piv, tsg, tsi
Event Title:The Third International Conference on Railway Technology: Research, Development and Maintenance
Event Location:Cagliari, Sardinia, Italy
Event Type:international Conference
Event Start Date:5 April 2016
Event End Date:8 April 2016
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: Bachmann, Barbara
Deposited On:12 Aug 2016 15:35
Last Modified:24 Apr 2024 20:03

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