چكيده به لاتين
Abstract:
In recent years, increasing speed and reducing weight of railway vehicles has raised concerns
about the risk of instability and overturning of these vehicles. Blowing crosswind is an
affective factors in overturning and derailment, when accompanied with speed of high-speed
trains, increase risk of overturning and derailment. Unlike other researches that considering
only two variables(relative wind speed and relative wind blowing angle); in this study,
numerical simulation of crosswind induced air flow around an ICE2 train model, performed
by considering three variables(train speed, wind speed and wind blowing angle), with aid of
RANS equations of computational fluid dynamic and aerodynamic coeffecients obtained.
This method specify portion of wind speed and train speed on unstability of train motion,
separately. Critial range of train motion determined by this results. Then, 8 new nose shape
generated by considering 5 geometerical parameters and apply on basic geometery (ICE2
aerodynamic train model). Effect of change geometrical parameters reported by
comparisoning of these 9 geometeries aerodynamic coefficients and reasons explained.
Investigations showed among considered geometrical parameters, reducing nose thickness
and increasing nose length is more favorable than reducing nose width and increase nose tip
hight have unfavorable effect on train motion stability.
Keywords: train aerodynamics- crosswind- stability of movement- overturnning
