Rail Effect on Aerodynamic Drag Characteristics of High-speed Train

doi:10.3901/JME.2018.16.152

Abstract

Abstract: Based on the three-dimensional CFD numerical simulation software, the aerodynamic model of a full-size high-speed train with an average speed of 350 km/h is applied. The effects of the aerodynamic drag of the train and the bogie, the pantograph, the windshield and the different carriages are studied with the track and its member.The results show that the model without rail and sleeper is compared with rail and sleeper model, which increases the differential pressure drag and friction drag of the vehicle and increases the pressure drag by about 12%. The increase of amplitude is mainly concentrated in the car near the front and the rear of the train, which has the greatest influence on the differential pressure drag of the second car, which increases by about 110%.The main reason for the decrease of the differential pressure drag and friction drag is that the track restricts the generated of the tail vortex and the friction of the rail.The influence of the track on the components of the train is related to the space position. The closer to the track, the influnce is greater. The farther to the track,the influnce is smaller. The track makes the differential pressure drag and friction drag of the bogie decrease, and the influence is mainly concentrated in the head car and the second car bogie, which has the greatest influence on the differential pressure drag of the bogie of the second car. The track has no effect on the aerodynamic drag of the windshield and the pantograph. The results shows that the influence of track on aerodynamic drag of train is obvious. The results can provide a comparative reference for the numerical simulation result checking and drag reducting design and safe operation of the train.

Key words: aerodynamic drag, high speed train, rail, sleeper, track

CLC Number:

U270

HUO Qing, MEI Yuangui. Rail Effect on Aerodynamic Drag Characteristics of High-speed Train[J]. Journal of Mechanical Engineering, 2018, 54(16): 152-159.

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