The Study Of The Influence Of Bogie On Areodynamic Characteristics Of High-Speed Trains

High speed train aerodynamic problems are closely associated with the flows occuring around train. The flows around the train are more disturbed due to turbulence of the increased speed of the train. This has led to large energy losses, since the aerodynamic drags are increased, and the aerodynamic performance of the bogie can not be neglected.The computational models for the properties of high speed train on basic aerodynamic, under crosswind, during passing events and passing tunnel were built by using CFD software FLUENT and multi-body dynamics software SIMPACK. The distribution of the aerodynamic drag of the whole train, the influence of the bogie on varies propeties of aerodynamics and vehicle dynamics was deeply studied through these models. These conclusions can be abtained as follows:1. On no cross-wind condition, the aerodynamic drag only on the bogies is about20%of the total drag. On cross-wind codition, the aerodynamic drag only on the bogies is about30%of the total drag. With the cross-wind increased, the drag proportion on the head-train is reduced reduced, the drag proportion on the tail-train is increase, and the drag proportion on the middle-train is almost the same.2. Change the bottom shape reasonably of the train on the boie area can reduce the aerodynamic drag of the train. This can reduce the energy losses and make the high speed train operation more economically.3. The bogies have big influences on the train performances on the crosswind condition. Compared with the traditional simplified train, the train had bogies is more safety on the crosswind condition.4. The bogies have big influences on the aerodynamic performance and stable performance of the train in passing events.5. The bogies have big influence on the aerodynamic performance of the train when passing through tunnel. The lateral acceleration on the train has bogies is bigger than the simplified train, meanwhile the displacement on the train has bogies is smaller than the simplified train when the train travelling through a tunnel.