Study of the Air Conditioning Installation Mode’s Effect on Aerodynamic Performance of High Speed Train

Abstract

With the improvement of the train speed, the interaction between train and air increases obviously, creating a series of aerodynamic performance problems that cannot be ignored. This paper focuses on high-speed train drag reduction research, to study whether the installation of air conditioning system will have a greater resistance to the train and the influence of the diversion angle of the air deflector on the aerodynamic characteristics of the train running in different environments. The results indicates as follows: In the open environment, when the roof of the train is installed with air conditioning, the resistance coefficient of the head car, the middle car and the tail car is increased by 27.39%, 20.33% and 18.25% respectively, while the resistance coefficient of the pantograph is reduced by 22.07% and the resistance coefficient of the vehicle up to 19.23%; With the air conditioning shroud diversion angle changed from 90° to 15°, in the open environment, vehicle air resistance decreased by 11.77%, the total resistance of the three air-conditioning decreased by 59.04%; In the crosswind environment, the overturning moment coefficients of air conditioners increased by 14.84%, 17.61% and 4.90% respectively.