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HIGH-SPEED TRAINS AERODYNAMICS UNDER CROSSWIND CONDITIONS: THE EFFECT OF THE TRAIN COOLING SYSTEMS

Master's Thesis Presentation

Alexandre Medina

Advisors:

Dr. Steve Cochard & Dr. Francisco José de Souza

Graduate Program - Mechanical Engineering, FEMEC, UFU - Uberlândia, Brazil - November 10th, 2017

HIGH-SPEED TRAINS AERODYNAMICS UNDER CROSSWIND CONDITIONS: THE EFFECT OF THE TRAIN COOLING SYSTEMS

OBJECTIVES

HISTORY & BACKGROUND

IMPROVE THE SAFETY OF HIGH-SPEED TRAINS UNDER CROSSWIND CONDITIONS

- 29,792 km of HSL (UIC,2015);

- 3,602 HST in 20 countries;

- Validate the CFD simulations with respect to the KKK wind tunnel results;

- 1,600 million passenger per year;

- Parametrize the influence of a moving model for the STBR configuration;

- Define if the train stability is affected, or not, by the intake and exhaust systems;

- April 1892 - St. Louis, USA;

- 29 crosswind-induced accidents:

- Narrow gauge lines;

- Bridges;

3) Moving model: MRF;

- Embankments;

4) Reduced vs. Full-scale;

- Plain & desert regions.

Crosswind - TSI: EN-14607-6

Wind tunnel testing

Literature Review

- First studies: Mair & Stewart (1985), Copley (1987), Chiu & Squire (1992);

- Static model;

- Low turbulence uniform inlet;

- Splitter-plate and moving rig;

- Single Track Ballast & Rail (STBR);

- CSTB - Nantes, France;

- DLR KKK - Göttingen, Germany;

- Stadler EC250 (Smile).

VALIDATION

ANALYSIS

Wind Tunnel Size

STBR Geometry

Intake & Exhaust

Moving Model

Moving Model: Reduced-scale

Moving Model: Full-scale

Mesh Dependency

Turbulence Models

CFD vs. PIV

Graduate Program - Mechanical Engineering, FEMEC, UFU - Uberlândia, Brazil - November 10th, 2017

HIGH-SPEED TRAINS AERODYNAMICS UNDER CROSSWIND CONDITIONS: THE EFFECT OF THE TRAIN COOLING SYSTEMS

CONCLUSIONS

Graduate Program - Mechanical Engineering, FEMEC, UFU - Uberlândia, Brazil - November 10th, 2017

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To my family for their unconditional love and support.

- ABL: Robinson & Baker (1991), Bocciolone et al. (2008);

- Topography: Schober et al. (2010);

160 x 1E6

130 x 1E6

~20% reduction

5) Model the inlets and outlets;

150 x 1E6

160 x 1E6

100 x 1E6

- Reynolds Number: Copley (1987), Bocciolone et al. (2008);

- Model Details: Deliancourt (2015);

- Moving Model: Baker (1986-91, 2004), Bocciolone (2008), Dorigatti (2015);

HIGH-SPEED TRAINS AERODYNAMICS UNDER CROSSWIND CONDITIONS: THE EFFECT OF THE TRAIN COOLING SYSTEMS

2) Topography: STBR;

1) Wind tunnel size;

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