Influence of air chamber parameters in high-speed railway tunnel on aerodynamic effect of train surface
Using the three-dimensional,compressible,unsteady Navier-Stokes equations and the finite volume method,the effects of air chamber parameters in a single-line tunnel pedestrian passageway on the aerodynamic pressure and lateral forces on the surface of train were studied.The results indicate that the peak surface pressure of the train increases when air chambers are installed in the tunnel.This effect is more pronounced when the air chamber is located at the front of the tunnel,has a longer longitudinal length and a larger entrance area.For a tunnel length of 156 m,an air chamber with length of 50 m and entrance area of 1.2 m2 located at the front,and a train speed of 400 km/h,the positive and negative peak transient pressures on the train surface are increased by 0.2 kPa and 0.18 kPa,respectively,compared to the case without air chamber.The lateral force acting on the train fluctuates as it passes through the entrance of the air chamber,and the duration of the fluctuation increases with the increase of the air chamber length.Increasing the entrance area of the air chamber intensifies the fluctuation of the lateral force.After installing the air chamber,the peak lateral force acting on the train is generally less than 1%of its own weight,resulting in a low probability of train overturning.
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