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Using appropriate boundary layer tripping on high-speed train models used in wind tunnel experiments to minimize Reynolds number effects

Fey, Uwe (2016) Using appropriate boundary layer tripping on high-speed train models used in wind tunnel experiments to minimize Reynolds number effects. 8th International Colloquium on Bluff Body Aerodynamics and Applications, 07. - 11. Juni 2016, Boston, Massachusetts, USA.

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Official URL: http://www.northeastern.edu/bbaa8/

Abstract

Wind tunnel testing of high-speed trains is mainly concerned with the experimental determination of force- and moment coefficients to be used for stability calculations with respect to wind-induced de-railing risks. For the gathered data, a Reynolds number dependency of the results is observed. The European and national standards treat the problem of Reynolds number independency for wind tunnel results differently, to make the obtained coefficients reliable. However, the reason for Reynolds number sensitivity has not been really addressed so far. Based on experiment¬tal investigations of the wall-bounded flow structures, it is shown in this paper that (laminar) flow separation alongside the windward roof edge represents a source for Reynolds number dependency, seen especially in the lift-force coefficient. Based on the topology of these flow structures, selective boundary layer tripping is applied to minimize Reynolds number effects with only small influence on the global flow field

Item URL in elib:https://elib.dlr.de/104958/
Document Type:Conference or Workshop Item (Speech)
Additional Information:http://nuweb1.neu.edu/bbaa8/wp-content/uploads/2016/05/BBAA_VIII_Full-Program-5-25-2016.pdf
Title:Using appropriate boundary layer tripping on high-speed train models used in wind tunnel experiments to minimize Reynolds number effects
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fey, Uweuwe.fey (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:cross-wind, high-speed train, Reynolds number effects, boundary layer tripping, separation bubble
Event Title:8th International Colloquium on Bluff Body Aerodynamics and Applications
Event Location:Boston, Massachusetts, USA
Event Type:international Conference
Event Dates:07. - 11. Juni 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:09 Sep 2016 13:05
Last Modified:09 Sep 2016 13:05

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