Movement Characteristics of Wind and Snow around High-speed Trains and Causes of Snow Accumulation in Bogie Regions
The issue of serious snow accumulation around the bogie regions of a high-speed train was investigated using the coupled numerical method of unsteady Reynolds-averaged Navier-Stokes simulations(URANS)with Realizable k-e coupled with the discrete phase model(DPM).The causes of snow accumulation in the bogie area were revealed based on the comprehensive analysis of the temporal and spatial evolution characteristics of the wind and snow two-phase flow in the bogie region.The research results show that a large number of snow particles follow the high-speed airflow beneath the shear layer in the bogie region and flow out of the bogie cavity,with some of the snow particles following the upward airflow in the middle bogie cavity and near the rear end plate and sticking onto the windward side of the bogies and rear plates,thereby contributing to massive snow accumulation on the bottom surface of the bogie.Only a few snow particles in the vicinity of the rear side motors and rear end plates climb upward into the upper region of the bogie cavity,and converge at the top of the rear end plate before returning to the front end plate driven by low-speed airflow and rejoining the underbody flow field.The suspended snow particles deposit on the top surface of the bogie with the action of gravity,therefore causing a small amount of snow accretion on the upper surface of the bogie.
high-speed trainbogie regionwind-snow two-phase flownumerical simulationice and snow wind tunnel testsnow accumulation cause
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