Analysis of Overturn of High-Speed Train with Various Nose Shapes Under Crosswind

Abstract

Recently, overturning of high-speed train under blowing crosswind is under the focus of many transportation industries. In this study, the procedure of determination of critical wind velocity of overturn of ICE2 train model is introduced with numerical simulation. According to the simulation and the equilibrium of train, the overturn conditions are determined due to the train and wind velocity. The geometrical parameters of train nose shape are considered, and basic geometry is modified to generate seven new geometries. By comparing aerodynamic results of these eight nose shapes, influence of each parameter is reported on the overturn of train. Results show that, reduction in thickness of train nose or nose tip angle and increase in train nose length have more desirable effect on safety of train movement to prevent overturn. Finally, the aerodynamic results of shape type of train nose can be used by high-speed rail masters as a comparative option.

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Abbreviations

C F :

Aerodynamic force coefficient

C M :

Aerodynamic moment coefficient

d :

Characteristic length

F B :

Body force

f m :

Method factor

f Δ Q :

Unloading factor

f Δ Q aero :

Aerodynamic unloading factor

g :

Gravity acceleration

h c :

Characteristic height

h tr :

Train height

k :

Turbulence kinetic energy

M COG :

Moment due to the lateral movement of the center of gravity of suspended masses

M la :

Moment due to uncompensated lateral acceleration

M m :

Restoring moment due to the vehicles masses

p :

Pressure

S :

Cross-section area (characteristic area)

t :

Time

U :

Flow speed

u :

X direction of wind speed vector component

v :

Y direction of wind speed vector component

v a :

Relative wind speed

v tr :

Train speed

v w :

Wind speed

w :

Z direction of wind speed vector component

y*, y + :

Non-dimensional wall distance

β :

Yaw angle (relative wind angle)

β w :

Wind blowing angle

ε :

Turbulence dissipation rate

ρ :

Density

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Correspondence to Mohammad Reza Talaee.

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Ezoji, R., Talaee, M.R. Analysis of Overturn of High-Speed Train with Various Nose Shapes Under Crosswind. Iran J Sci Technol Trans Mech Eng (2021). https://doi.org/10.1007/s40997-021-00426-4

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Keywords

  • Train aerodynamics
  • Train overturn
  • Crosswind effects