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Aerodynamic Investigations of the Effects of Virtual Coupling on two Next Generation Trains

Wilhelmi, Henning and Thieme, Thomas and Henning, Arne and Wagner, Claus (2018) Aerodynamic Investigations of the Effects of Virtual Coupling on two Next Generation Trains. In: 20th STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics, 136, pp. 695-704. Springer. 20. DGLR Fachsymposium der STAB, 08.-09. Nov. 2016, Braunschweig, Deutschland. DOI: 10.1007/978-3-319-64519-3 ISBN 978-331964518-6 ISSN 1612-2909

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Official URL: https://link.springer.com/chapter/10.1007/978-3-319-64519-3_62

Abstract

This paper presents the results of force measurements on a tandem con-figuration (platoon) of two train models (Type: Next Generation Train) at varying distances in heading direction in the water towing tank at the German Aerospace Center Göttingen (DLR). The trains had no mechanical connection to represent the occurring situation of virtual coupling. The experiments were conducted at a Reynolds number of 240,000 at 4 m/s. A ground plate was used to account for under floor effects. The gap distance was varied between 1.2% and 59.5% of the single train length. In comparison to a single vehicle, drag reductions of up to 30.4% were observed for the trailing vehicle at all distances. For the leading train reduced resistances at distances ≤ 12% were found. The combined drag of two vehicles is up to 16% less than the resistance of two single trains. With Particle Image Velocimetry (PIV) a strong interaction between both trains is observed at closest distance (1.2%). An area of reduced relative velocity and thus reduced stagnation pressure in front of the second train is found to be the reason for a smaller drag. At wider gaps (35.7% and 47.6%) a beneficial development of vorticity behind the first train is found to be the cause of a reduced drag value on the trailing vehicle.

Item URL in elib:https://elib.dlr.de/110695/
Document Type:Conference or Workshop Item (Speech)
Additional Information:ISSN 1860-0824 (elektronisch; ISBN 978-3-319-64519-3 (eBook)
Title:Aerodynamic Investigations of the Effects of Virtual Coupling on two Next Generation Trains
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wilhelmi, HenningHenning.Wilhelmi (at) dlr.deUNSPECIFIED
Thieme, ThomasUNSPECIFIEDUNSPECIFIED
Henning, ArneUNSPECIFIEDUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Date:2018
Journal or Publication Title:20th STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:136
DOI :10.1007/978-3-319-64519-3
Page Range:pp. 695-704
Editors:
EditorsEmail
Dillmann, AndreasDLR Göttingen
Heller, GerdAirbus Bremen
Krämer, EwaldUni Stuttgart
Wagner, ClausDLR Göttingen
Bansmer, StephanTU Braunschweig
Radespiel, RolfTU Braunschweig
Semaan, RichardTU Braunschweig
Publisher:Springer
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design 136
ISSN:1612-2909
ISBN:978-331964518-6
Status:Published
Keywords:STAB, Aerodynamics, Aerodynamik, Dynamisches Flügeln, Virtual Coupling, Electronic Coupling, Next Generation Train, NGT, Platooning, Convoi, Konvoi, Wasserschleppkanal, Water-towing tank, PIV, Particle Image Velocimetry, Force Measurements
Event Title:20. DGLR Fachsymposium der STAB
Event Location:Braunschweig, Deutschland
Event Type:national Conference
Event Dates:08.-09. Nov. 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 > Ground Vehicles
Deposited By: Bachmann, Barbara
Deposited On:18 Jan 2017 16:30
Last Modified:30 Nov 2018 15:39

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