翻译：5 总结本文采用了UDF程序自定义雪粒在流场中的受力状态和转向架区域离散相的边界条件计算了雪粒在主动吹气作用下的沉积特性并对两种主动吹气方案进行了评估主要结论如下：1 在吹气作用下转向架区域的压力分布有了很大的变化从而整车的压差阻力也随之变化。随着吹气速度增加列车的行驶阻力降低在吹气速度为4ms时方案1减阻率高达1955方案2的减阻率从为1006从而避免了使用导流板预防积雪时带来列车行驶阻力

5 Summary This article uses UDF program to customize the force state of snowflakes in the flow field and the boundary conditions of the discrete phase in the steering gear area, and calculates the sedimentation characteristics of snowflakes under active blowing. Two active blowing schemes are evaluated, and the main conclusions are as follows: (1) Under blowing, the pressure distribution in the steering gear area has changed significantly, and the pressure difference resistance of the entire vehicle has also changed. As the blowing speed increases, the running resistance of the train decreases. When the blowing speed is 4m/s, the drag reduction rate of scheme 1 is as high as 19.55%, and the drag reduction rate of scheme 2 is 10.06%, thus avoiding the increase in running resistance of the train when using guide plates to prevent snow accumulation. (2) The friction speed on the surface of the steering gear changes under blowing, which affects the stability of snowflake sedimentation. Blowing changes the flow field characteristics in the steering gear area, reduces the up-flow lines, and reduces the number of snowflakes entering the steering gear area, achieving the effect of preventing snow accumulation. (3) Combining the energy required for blowing and the energy saved by reducing the train's drag, the design scheme is evaluated. Scheme 1 has a more significant reduction in running resistance because the blowing port is closer to the front of the steering gear cabin. Scheme 1 also has a more prominent anti-snow effect on the entire steering gear, which can reduce more snow accumulation under the same additional energy.