以完成时态润色：To reduce excessive snow accumulation on the bogie surface during the operation of high-speed trains in cold regions this study designs two active blowing schemes according to the shape of the

To reduce excessive snow accumulation on the bogie surface during the operation of high-speed trains in cold regions, two active blowing schemes have been designed in this study based on the shape of the bogie cavity and the relative position of the brake caliper. The unsteady Reynolds-average Navier–Stokes algorithm coupled with a discrete phase model was used to calculate the airflow and snow flow under the train, and explore the impact of active blowing on the flow field characteristics and snow accumulation in the bogie region. The results have shown that active blowing changes the upswing of the airflow in the bogie region, causing the airflow at the bottom of the train to flow outward, carrying a large number of snow particles away from the bogie region. Active blowing increases the surface friction velocity on the bogie, increases the shear force on the snow particles, and effectively reduces snow accumulation on the bogie surface. By evaluating the two blowing schemes, scheme 1 was found to be more effective in reducing snow particle accumulation under unit air supply volume and unit energy consumption. Therefore, the effect of active blowing on snow prevention is quite optimistic