Effect of Raindrop Particle Size Distribution on Aerodynamic Performance of High-speed Train

doi:10.3901/JME.2025.06.238

Abstract

Abstract: In order to quantitatively analyze the influence of raindrop particle size distribution on aerodynamic performance of high-speed train, a high-speed train outflow field model is established based on Euler method, and the effectiveness of its calculation method is verified. Rainfall models with uniform particle size and non-uniform particle size are established based on Lagrange method. The wind and rain coupling numerical simulation of high-speed trains under different rainfall models, different rainfall intensities and different vehicle speeds is carried out by using the phase coupling calculation method. The results show that the raindrop trajectory of the uniform particle size rainfall model is approximately parallel, while the non-uniform particle size rainfall model is complex and staggered; In both models, the raindrop mass per unit time increases with the increase of rainfall intensity and vehicle speed. When the vehicle speed is constant, the concentration of raindrop on the train surface increases with the increase of rainfall intensity. The concentration distribution of raindrop on the train surface of uniform particle size rainfall model is more concentrated and regular, while the non-uniform particle size rainfall model is more scattered and disorderly; When the vehicle speed is constant, with the increase of rainfall intensity, the positive pressure range at the nose tip of the train increases gradually, and the aerodynamic drag force and longitudinal rain load of the train increase; Under the same vehicle speed and rainfall intensity, compared with the calculation results of uniform particle size rainfall model, the positive pressure range at the nose tip of the head train under the non-uniform particle size rainfall model decreases, which leads to the reduction of aerodynamic drag force of the head train under the non-uniform particle size rainfall model, but the longitudinal rain load of the head train under the non-uniform particle size rainfall model increases. To sum up, the longitudinal total drag force of the head train under the non-uniform particle size rainfall model is lower than that under the uniform particle size rainfall model.

Key words: rainfall environment, high-speed train, raindrop size distribution, aerodynamic characteristic, rain load

CLC Number:

U270

SHENG Xugao, YU Mengge, DAI Zhiyuan, ZHANG Qian. Effect of Raindrop Particle Size Distribution on Aerodynamic Performance of High-speed Train[J]. Journal of Mechanical Engineering, 2025, 61(6): 238-248.

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