Coupling Mechanism of Airflow Field and Rain Field of High-speed Train Under Heavy Rainfall Environment

doi:10.3901/JME.2025.12.241

Abstract

Abstract: In the study of rain field and airflow field characteristics of high-speed train under heavy rainfall environment，previous work mainly focused on the study of airflow field characteristics，but the movement of airflow field and rain field are coupled，and in this paper，the airflow field，rain field and their coupling motion are systematically analyzed: Based on Euler-Lagrange method，the numerical simulation model of high-speed train airflow field and rain field under heavy rainfall environment is established，and the motion characteristics of raindrop and airflow are analyzed from the perspectives of raindrop Reynolds number，drag force and turbulent kinetic energy. The results show that: When raindrop initially enters the airflow field，the Reynolds number of raindrop is large，and the longitudinal drag force of raindrop is large，and the airflow plays a role in promoting the longitudinal movement of raindrop. With the longitudinal displacement of raindrop increases，the Reynolds number of raindrop decreases，the longitudinal drag force also decreases，and the longitudinal interaction between raindrop and airflow becomes weaker. When raindrop falls near the nose tip of the head train，the Reynolds number of raindrop increases sharply，and the longitudinal drag force increases sharply，and the airflow acts as a block to the longitudinal motion of raindrop; When the train speed is constant，the turbulent kinetic energy near the nose tip of the head train decreases with the increase of rainfall intensity. When the rainfall intensity is constant，the turbulent kinetic energy near the nose tip of the head train increases with the increase of the train speed; When the train speed is constant，the positive pressure range near the nose of the head train，the aerodynamic drag and the aerodynamic lift of the head train gradually increase with the increase of rainfall intensity.

Key words: rainfall environment, high-speed train, raindrop Reynolds number, drag force, aerodynamic characteristics

CLC Number:

U270

SHENG Xugao, YU Mengge, LI Meixiang, LIU Jiali. Coupling Mechanism of Airflow Field and Rain Field of High-speed Train Under Heavy Rainfall Environment[J]. Journal of Mechanical Engineering, 2025, 61(12): 241-250.

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