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Representing large boundary layers in slipstream moving model tests

Sima, M. and Tietze, A. and Schulz, B. and Ehrenfried, Klaus (2016) Representing large boundary layers in slipstream moving model tests. Railways 2016, The Third International Conference on Railway Technology: Research, Development and Maintenance, 05. - 08. April 2016, Cagliari, Italy.

Full text not available from this repository.

Official URL: http://www.civil-comp.com/conf/rw2016/rw2016.htm

Abstract

When a train drives it induces airflow along the side of the train and behind it, commonly denoted as slipstream. The induced airflow will impact the surrounding in the vicinity of the passing train and can be hazardous for people and objects on platforms or trackside workers. Therefore there exist limits which the train must comply to get authorisation to be placed in service. In Europe the Technical Specification for Interoperability (TSI), which has the level of law, gives requirements to fulfil. The air speed is measured in full scale tests at a specific distance from the track centreline (3.0 m), at two heights (0.2 m and 1.4 m). The upper location is representative of platforms and the lower of trackside workers. The train should be the longest configuration; if operated with multiple coupled units, at least two units. Due to the highly stochastic nature of the flow many independent measurements are needed to get representative values of the induced air flow with reasonable accuracy. As a balance between practicality and accuracy, 20 independent measurements are required. It was seen in the EU project on railway aerodynamics AeroTRAIN [1, 2] that even low wind speeds have a noticeable influence on the measured values, why for valid measurements the ambient wind needs to be equal or less than 2 m/s, which again is a balance between practicality and accuracy.

Item URL in elib:https://elib.dlr.de/98881/
Document Type:Conference or Workshop Item (Speech)
Title:Representing large boundary layers in slipstream moving model tests
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sima, M.Mikael.sima (at) se.transport.bombardier.comUNSPECIFIED
Tietze, A.Centre of Competence Aero- and Thermodynamics, Bombardier Transportation, GermanyUNSPECIFIED
Schulz, B.Centre of Competence Aero- and Thermodynamics, Bombardier Transportation, GermanyUNSPECIFIED
Ehrenfried, Klausklaus.ehrenfried (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Conference Proceedings
Status:Published
Keywords:Train, Slipstream, moving model, measurements, roughness elements, boundary layer generation, TSI
Event Title:Railways 2016, The Third International Conference on Railway Technology: Research, Development and Maintenance
Event Location:Cagliari, Italy
Event Type:international Conference
Event Dates:05. - 08. 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 for Aerodynamics and Flow Technology > Fluid Systems, GO
Deposited By: Bachmann, Barbara
Deposited On:11 Jul 2018 14:01
Last Modified:11 Jul 2018 14:01

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