Simulation on Air Flow Field of High speed Train Concerning the Environment Under Train

Abstract:

A 3D model of the EMU and the railway is built; based on the requirements of finite element methods (FEM), the whole simulation model of the EMU is divided into 4 different parts to improve the efficiency of simulation, including the head part of the train, the tail part of the train, the front part of middle vehicles and the rear part of middle vehicles. The distribution characteristic of the air flow field at the speed of 300 km·h-1 is simulated by using unstructured mesh. The simulation results show that the resistance of the whole train is approximately 69.3kN. The lower parts of the flow field, especially the parts near the bogies, show very complicated distribution, which are dominated by turbulence. The lower parts of the flow field contribute about 33.6% of overall resistance, and the maximum pressure difference of these parts is about 8kPa. Compared with the test results of inter city express(ICE) and Train à Grande Vitesse(TGV) high speed trains, the proposed simulation method and its results are verified.