Abstract

In this paper, the unsteady Reynolds-Averaged Navier-Stokes simulations (URANS) was coupled with the Discrete Phase Model (DPM) to study snow accretion on the bogies of a high-speed train under crosswind conditions. The influence of bogie fairing configurations on the snow particles’ movement, accumulation and flow characteristics around bogie regions are assessed. The results show that the larger bogie fairings have a positive effect on snow reduction around the main components of bogies under crosswind conditions. Compared to currently used bogie fairings, the total snow accretion of a head car increases by 41.5% by removing the fairings, while it decreases by 24.9% with the installation of full bogie fairings. The larger bogie fairings can lower the velocity of underbody flow and prevent high-speed airflows from entering the bogie regions from the windward side of bogie cavities. Moreover, the larger bogie fairings reduce the snow concentration around the heat-producing components of the bogies and attenuate the amount of snow particles near the rear plates of the cavities. Thus, the larger fairings can provide better anti-snow performance of train bogies under crosswind conditions.

摘要

在本文中，非定常雷诺平均纳维斯托克斯模拟 (URANS) 与离散相模型 (DPM) 相结合，研究侧风条件下高速列车转向架上的积雪。评估了转向架整流罩配置对转向架区域周围雪粒运动、积聚和流动特性的影响。结果表明，侧风条件下较大的转向架整流罩对转向架主要部件周围的降雪有积极的作用。与目前使用的转向架整流罩相比，去除整流罩后头车的总积雪增加了41.5%，而安装全转向架整流罩则减少了24.9%。较大的转向架整流罩可以降低车身底部气流的速度，并防止高速气流从转向架空腔的迎风侧进入转向架区域。此外，较大的转向架整流罩降低了转向架发热部件周围的雪浓度，并减少了空腔后板附近的雪颗粒量。因此，较大的整流罩可以在侧风条件下为列车转向架提供更好的抗雪性能。