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Full scale measurements of train underbody flows and track forces

Full scale measurements of train underbody flows and track forces
Full scale measurements of train underbody flows and track forces
This paper presents the results of full scale measurements of the underbody flow characteristics and track behaviour beneath a high speed train on a line in the south of England. Simultaneous measurements were made of the flow velocities and pressures beneath the train, sleeper displacements and ballast accelerations. The results showed that, while the mechanical measurements of displacement and acceleration were essentially deterministic and varied little from one train passage to another, the aerodynamic measurements were highly variable with substantial run-to-run variation. Vertical ballast accelerations with peaks greater than the acceleration due to gravity were measured for short durations. Velocity and turbulence intensity profiles were derived, from which aerodynamic shear forces at the ballast surface were estimated. Assessment of the magnitudes of the different forces acting on the ballast showed that the mechanical forces associated with track displacement and the aerodynamic forces were of similar order of magnitude on well performing track. For poorly maintained track with higher accelerations, the effects of track vibration on the initiation of ballast motion are likley to be much more significant.
Train underbody flow, Aerodynamic loads on track, Boundary layers, Ballast
0167-6105
251-264
Soper, D.
38192498-2c45-44b1-853a-6df14ac217aa
Baker, C.
41d97096-3dfd-440b-90e7-68db1aae8db2
Jackson, A.
e676126a-4743-4456-b023-deafc8b8a427
Milne, David
6b321a45-c19a-4243-b562-517a69e5affc
Le Pen, L.
4a38e256-d113-4bba-b0d4-32d41995928a
Watson, G.
a7b86a0a-9a2c-44d2-99ed-a6c02b2a356d
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Soper, D.
38192498-2c45-44b1-853a-6df14ac217aa
Baker, C.
41d97096-3dfd-440b-90e7-68db1aae8db2
Jackson, A.
e676126a-4743-4456-b023-deafc8b8a427
Milne, David
6b321a45-c19a-4243-b562-517a69e5affc
Le Pen, L.
4a38e256-d113-4bba-b0d4-32d41995928a
Watson, G.
a7b86a0a-9a2c-44d2-99ed-a6c02b2a356d
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c

Soper, D., Baker, C., Jackson, A., Milne, David, Le Pen, L., Watson, G. and Powrie, W. (2017) Full scale measurements of train underbody flows and track forces. Journal of Wind Engineering and Industrial Aerodynamics, 169, 251-264. (doi:10.1016/j.jweia.2017.07.023).

Record type: Article

Abstract

This paper presents the results of full scale measurements of the underbody flow characteristics and track behaviour beneath a high speed train on a line in the south of England. Simultaneous measurements were made of the flow velocities and pressures beneath the train, sleeper displacements and ballast accelerations. The results showed that, while the mechanical measurements of displacement and acceleration were essentially deterministic and varied little from one train passage to another, the aerodynamic measurements were highly variable with substantial run-to-run variation. Vertical ballast accelerations with peaks greater than the acceleration due to gravity were measured for short durations. Velocity and turbulence intensity profiles were derived, from which aerodynamic shear forces at the ballast surface were estimated. Assessment of the magnitudes of the different forces acting on the ballast showed that the mechanical forces associated with track displacement and the aerodynamic forces were of similar order of magnitude on well performing track. For poorly maintained track with higher accelerations, the effects of track vibration on the initiation of ballast motion are likley to be much more significant.

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Ballast_flight_Soper_et_al_2017 - Accepted Manuscript
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Accepted/In Press date: 31 July 2017
e-pub ahead of print date: 8 August 2017
Published date: October 2017
Keywords: Train underbody flow, Aerodynamic loads on track, Boundary layers, Ballast

Identifiers

Local EPrints ID: 413946
URI: http://eprints.soton.ac.uk/id/eprint/413946
ISSN: 0167-6105
PURE UUID: 3625566b-f071-42bf-9feb-9040bc4599e0
ORCID for David Milne: ORCID iD orcid.org/0000-0001-6702-3918
ORCID for L. Le Pen: ORCID iD orcid.org/0000-0002-4362-3895
ORCID for G. Watson: ORCID iD orcid.org/0000-0003-3074-5196
ORCID for W. Powrie: ORCID iD orcid.org/0000-0002-2271-0826

Catalogue record

Date deposited: 11 Sep 2017 16:31
Last modified: 07 Oct 2020 04:42

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Contributors

Author: D. Soper
Author: C. Baker
Author: A. Jackson
Author: David Milne ORCID iD
Author: L. Le Pen ORCID iD
Author: G. Watson ORCID iD
Author: W. Powrie ORCID iD

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