Study on Aerodynamic Drag Forces and Economics of 400 km/h High-speed Train with Different Streamline Lengths

doi:10.3901/JME.2025.22.211

Abstract

Abstract: In order to analyze the influence of streamline length on aerodynamic drag of high-speed train, based on computational fluid dynamics, the aerodynamic drag distribution characteristics of 400 km/h high-speed trains running on open lines are numerically simulated, the aerodynamic drag of train models with different streamline lengths is predicted. The reliability of the numerical simulation is verified by the wind tunnel test. Under the condition of the same length of the whole train, the influence of the streamline length of the head and tail car on the aerodynamic drag of the streamlined head, non-streamlined car body and bogie is studied. The length of the streamline is 10-15 m. The economic benefit relationship between the positive benefit of aerodynamic drag reduction and the negative benefit of passenger space reduction caused by the increase of streamline length is discussed. The results show that the resistance of the streamlined area of the head car is positively correlated with the ratio of its surface area to the streamline length. The resistance per meter in the non-streamlined area of the head car decreases gradual to the central area of the train, and the resistance per meter of the middle car decreases slowly to the direction of the tail car. The resistance per meter of the non-streamlined part of the tail car gradually converges; the streamline resistance of the tail car decreases with the length of the streamline. When the streamline length is about 13 m, the maximum benefit of 49.88 yuan/km is achieved, and the aerodynamic drag of 700 N is reduced, the benefit is optimal.

Key words: high-speed train, non-streamline type, aerodynamic drag, numerical simulation, economic benefits

CLC Number:

U271

ZHOU Zhi, LI Tian, DAI Zhiyuan, XIANG Zerui, ZHANG Jiye. Study on Aerodynamic Drag Forces and Economics of 400 km/h High-speed Train with Different Streamline Lengths[J]. Journal of Mechanical Engineering, 2025, 61(22): 211-221.

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