Visualization Study Of The Influence Of
Parapets On The Flow Around A Train
Vehicle Under Cross Winds
Author(s)
M. A. Barcala & J. Meseguer
Abstract
Aerodynamic loads on train vehicles under cross winds are governed both by the
shapes of the vehicles and of the surroundings. Aerodynamic loads due to cross
winds are of paramount importance in the lateral equilibrium of the vehicle, in
such a way that if the lateral wind speed becomes larger than a threshold value
the overturning of the vehicle can take place. The degree of danger against
overturning increases when the train is on a bridge, the reason being that the
velocity in the atmospheric boundary layer grows as the height increases, leaving
aside the fact that at ground level there may be other elements acting as
windbreaks (mainly vegetation).
The effects of different types of parapets, either solid or porous, on the wind
protection of a train vehicle on a bridge under cross wind have been visualized
by smoke wind-tunnel tests. In addition the effects of several types of solid
parapets on the side force and rolling moment acting on a two-dimensional
model of the same high-speed train coach have been measured by wind-tunnel
pressure measurements. Experimental results show that, as one could expect,
solid parapets seem to be more effective than porous ones, and the aerodynamic
loads decrease as the height of the windbreak increases.
Keywords: flow visualization, train aerodynamics, wind tunnel tests, overturning
of train.
Keywords
flow visualization, train aerodynamics, wind tunnel tests, overturning
of train.
Related Book
Other papers in this volume
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