风沙环境下列车气动性能的研究

Research on Aerodynamic Performance of EMU Train in Wind and Sand Environment

采用数值计算方法分别对在同一车速下相同风速、不同浓度、不同颗粒直径的风沙对动车组列车气动性能的影响,以及同风沙浓度、同风沙颗粒直径下,风速不同对列车气动性能的影响。结果表明在风速和风沙颗粒直径不变的情况下,沙粒颗粒浓度的增加和颗粒直径的增大都导致了列车整体的气动阻力的增大,但影响不大。在风沙颗粒浓度以及风沙颗粒直径不变的情况下,风速的增加使得风沙颗粒对列车整体的气动阻力有明显的增大。

The effects of wind and sand on the aerodynamic performance of EMU train at the same speed,different concentrations and different particle diameters,as well as the effects of wind speed on the aerodynamic performance of EMU train at the same wind and sand concentration and particle diameters,respectively,are calculated by numerical calculation method.The results show that with the same wind speed and particle diameter,the increase of particle concentration and particle diameter mostly leads to the increase of aerodynamic drag of the train,but the effect is not significant.When the concentration of sand particles and the diameter of sand particles remain unchanged,the increase of wind speed makes aerodynamic resistance of sand particles to the whole train obviously increases with the increase of wind speed.