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LI Renxian
LIU Yingqing
School of Mechanical Engineering,
Southwest Jiaotong University,
Chengdu 610031, China
ZHAI Wanming
National Key
Laboratory
of Traction Power,
Southwest Jiaotong University,
Chengdu 610031, China |
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SIMULATION STUDY OF
AERO-
DYNAMIC FORCE FOR HIGH-SPEED magnetically-levitated TRAINS*
Abstract:
Based on Reynolds average Navier-Storkes equations of viscous incompressible fluid and k-e two equations turbulent model, the aerodynamic forces of high-speed magnetically-levitated (maglev) trains in transverse and longitudinal wind are investigated by finite volume method. Near 80 calculation cases for 2D transverse wind fields and 20 cases for 3D longitudinal wind fields are analyzed.
The aerodynamic side force, yawing, drag, lift and pitching
moment for different types of maglev trains and a wheel/rail train are compared under the different wind speeds. The types of maglev train models for 2D transverse wind analysis included electromagnetic suspension (EMS) type train, electrodynamic suspension (EDS) type train, EMS type train with shelter wind wall in one side or two sides of guideway
and the walls, which are in different height or/and different
distances from train body. The situation of maglev train running
on viaduct is also analyzed. For 3D longitudinal wind field
analysis, the model with different sizes of air clearances
beneath maglev train is examined for the different speeds.
Calculation result shows that: ① Different transverse effects
are shown in different types of maglev trains. ② The shelter wind wall can fairly decrease the transverse effect on the maglev train. ③ When the shelter wall height is 2 m, there is minimum side force on the train. When the shelter wall height is 2.5 m, there is minimum yawing moment on the train. ④ When the distance between inside surfaces of the walls and center of guideway is 4.0 m, there is minimum trans-verse influence on the train. ⑤ The size of air clearance beneath train body has a small influence on aerodynamic drag of the train, but has a fairly large effect on aerodynamic lift and pitching moment of the train. ⑥ The calculating lift and pitching moment for maglev train models are minus values.
Key words:
Aerodynamic force Magnetically-levitated (maglev) train Stability
Numerical analysis
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