Abstract
Train aerodynamics problem must be solved with the development of high-speed railway around the world, and the drag directly affects the maximum running speed of high-speed train. This paper established the numerical calculation model for single train passing through the tunnel with the real configuration of a domestic EMU with eight carriages. The formation mechanism and variation characteristics of the drag over time were analyzed. The drag value and the distribution characteristic of the individual parts were studied at different times of the train passing through the tunnel. The maximum and minimum drag values of the tunnel were compared with the drag of the open air condition. Results indicate the Mach wave directly affected on the pressure drag, the aerodynamic drag distribution of the whole train is changed over time and the fluctuation range of the pressure drag is larger than the friction resistance when the train passing through the tunnel. The maximum value and minimum value of total drag when the train passes through the tunnel are 1.95 times and 0.88 times of that in the open air. When the train is running in the open air, the pressure drag and frictional drag accounted for 61% and 39% respectively of the total aerodynamic drag.
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