Aerodynamic Effects of Ravine Wind to Pantograph of High-speed Train Arriving at and Leaving a Tunnel

摘要

The process of an eight-car high speed train running through a canyon wind zone from a tunnel in the state of favorable pantograph (closing stomata) and adverse pantograph (opening stomata) was simulated by using the sliding mesh method, and the aerodynamic performance of the pantograph bow on the train was researched. The results show that when the train goes out of and enters the tunnel, the effect of cross wind on the change of the pantograph aerodynamic bow force is significant. The law of pantograph bow aerodynamic force peak with train speed and wind speed in the state of favorable pantograph is similar to the one in the state of adverse pantograph. The lift peak of the pantograph bow in the state of a favorable pantograph is a little larger than the one in the state of an adverse pantograph, and the difference of lateral force between them is little. Relative to the process of train entering into a tunnel, the pantograph bow lift pneumatic impact is worse when the train goes out of tunnel. When the wind speed is above 5m/s, the pantograph bow lift force peak process when the train is going out of the tunnel is larger than the one of the process when running from a canyon wind zone into a tunnel.