Aerodynamic Characteristics of High-Speed Train Entering and Leaving Tunnel Under Gorge Wind

The terrain of mountainous valleys is complex, and the distribution of wind speed along the railway is affected by the terrain of the valleys, resulting in uneven distribution of wind speed inside the valleys.Under the influence of the wind field in the gorge, the aerodynamic loads of the train when crossing bridges and tunnels change violently, causing a sudden increase in wheel-rail force, and reducing the safety of the train.In this paper CRH380A three-marshalling high-speed EMU is taken as the research object.the gorge wind field model is applied to the train running across the bridge and tunnel, and the effects of the gorge wind field model and the constant wind field model on the train's aerodynamic characteristics are compared.In the process of the train running across the bridge and tunnel, the difference in the aerodynamic load of each section under different wind fields is mainly reflected in the process of the train entering and leaving the wind field, and the transition section across the bridge and tunnel.The change rate and fluctuation amplitude of each aerodynamic load under a constant wind field are greater than those under gorge wind conditions.