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