Due to the deterioration of the crosswind-protection performance of the original earth embankment windbreak walls on the train with increased speed, researching the influence of the heightened windbreak walls on aerodynamic performances of trains as well as the protection of the catenary is necessary for optimizing the windproof performance. The improved delayed detached eddy simulation based on the shear stress transport (SST) κ-ω turbulence model was employed to simulate flow structures. Furthermore, the effect on the displacement of the catenary was investigated using the finite element method (FEM). The numerical case was validated against the field tests. The results show that the aerodynamic performances of the train were improved as the windbreak wall was heightened by 0.5 m. Whereas, further heightening the windbreak wall worsened the aerodynamic performance. When the windbreak wall was heightened by 0.5 and 1 m, the wind speed of the catenary was reduced by 31.17% and 53.87%, and the displacement of the catenary was reduced by 48.09% and 74.11%, respectively, compared with that of the original windbreak wall. These results reveal that the wind-protection performance on the train and catenary can be both improved by reasonably heightening windbreak walls.

由于列车提速后原土路堤防风墙的侧风防护性能恶化，研究加高防风墙对列车气动性能的影响以及悬链线的保护对于优化列车风动性能十分必要。防风性能。采用基于剪切应力传递（SST）κ-ω湍流模型的改进延迟分离涡模拟来模拟流动结构。此外，使用有限元法（FEM）研究了对悬链线位移的影响。数值案例已针对现场测试进行了验证。结果表明，随着防风墙加高0.5 m，列车气动性能得到改善。然而，进一步加高防风墙使空气动力学性能恶化。防风墙加高0.5和1 m时，接触网风速分别比原降低31.17%和53.87%，接触网位移分别降低48.09%和74.11%防风墙。这些结果表明，合理加高防风墙可以提高列车和接触网的防风性能。