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Rail vehicles in crosswinds: analysis of steady and unsteady aerodynamic effects through static and moving model tests

Dorigatti, Francesco (2013)
Ph.D. thesis, University of Birmingham.

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Abstract

This thesis presents the results of an experimental investigation of scale-model trains in crosswinds, undertaken to assess steady and unsteady aerodynamic effects of the vehicle movement simulation. A 1:25 scale-model train was tested in the University of Birmingham's TRAIN rig facility. A crosswind generator was designed and constructed to enable static and moving model experiments in the presence of crosswinds in this facility. An on­ board pressure measuring system comprising a series of miniaturised pressure transducers and a bespoke stand­ alone data logger were developed. Static and moving model experiments were carried out investigating a scale­ model of the Class 390 Pendolino train, on a nominal flat ground infrastructure scenario whilst subjected to a crosswind at 30° yaw angle.
The test facility, measuring equipment and experimental methodology that were developed led to a more realistic underbody flow simulation and to a reduced margin of experimental uncertainty with respect to previous moving model tests. Furthermore, they enabled detailed surface pressure data to be measured, which are suitable for CFD benchmarking. The results support the reliability of wind tunnel tests on static vehicles for investigating steady aerodynamic coefficients but suggest that their use in the analysis of train unsteady aerodynamics is not entirely satisfactory.

Type of Work:Ph.D. thesis.
Supervisor(s):Quinn, Andrew and Sterling, Mark
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Civil Engineering
Subjects:TA Engineering (General). Civil engineering (General)
Institution:University of Birmingham
ID Code:4267
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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