Research on Aerodynamic Drag Reduction of EMU Tail Car Bogie on Combined Suction and Blowing

Abstract

The flow field structure in the bogie region has an important impact on the aerodynamic drag of the EMU. In order to meet the lower aerodynamic drag requirements for further speed increases of EMU trains, this paper adopts numerical simulation method to study the active control drag reduction technology of suction and blowing air combined with bogie. The results indicate that the setting of suction and blowing air holes at the front and rear end plates of the tail bogie has only a drag reduction effect on the pressure drag in the aerodynamic drag of the bogie and tail car. With the change of suction and blowing air speeds, the drag reduction rate of the tail car reaches the optimal value of 3.82% at 0.05U, and the drag reduction rate of the bogie reaches the optimal value of 4.61% at 0.2U. The study on the combined suction and blowing air drag reduction method of the bogie has important significance in breaking through the limitations of traditional bogie aerodynamic drag reduction.