挡风墙尾流作用下导线表面粗糙度对接触网正馈线气动特性的影响

大风经过兰新高铁沿线挡风墙后，容易引发接触网正馈线发生舞动现象。为分析挡风墙尾流作用下导线表面粗糙度对正馈线气动特性的影响，基于流体力学建立铁路挡风墙尾流风洞实验装置与5种不同表面粗糙度导线模型。由于导线与整体计算域尺寸差距悬殊，对整体计算域的网格采用分块划分。利用流体仿真软件研究不同风速下正馈线的气动特性。结果表明：正馈线表面粗糙度越低，升、阻力增大越明显。在入口风速为1 m/s时，不同表面粗糙度正馈线升、阻力系数基本值保持稳定；在入口风速大于5 m/s时，随着表面粗糙度降低，正馈线升、阻力系数增大；不同表面粗糙度的正馈线尾部流场产生的漩涡不同，并且在导线凹凸处产生不同的细小漩涡。正馈线近壁面的气体流动特征发生较大变化，对导线气动特性影响较为明显。

The influence of wire surface roughness on the aerodynamic characteristics of the catenary positive feeder under the action of the wake flow of the wind-break wall

After the strong wind passed through the windshield wall along the Lanzhou-Xinjiang high-speed railway, the catenary positive feeder was galloping. In order to analyze the influence of the surface roughness of the stranded wire on the aerodynamic characteristics of the positive feeder under the action of the wake flow of the wind-break wall, a windshield wake wind tunnel experimental device and five wire models with different degrees of surface roughness were established based on fluid mechanics. Due to the large gap between the size of the wire and the overall computing domain, the fluid grid of the overall computing domain is divided into blocks. The fluid simulation software is used to study the aerodynamic characteristics of the forward feeder under different inlet wind speeds. The results show that the lower the surface roughness of the positive feeder is, the more obvious the lift and drag increase. When the inlet wind speed is 1m/s, the basic values of the lift and resistance coefficients of positive feeders with different degrees of surface roughness remain stable. When the inlet wind speed is greater than 5 m/s, the lift and drag coefficients of the positive feeder increase as the surface roughness of the positive feeder decreases. The vortices generated in the tail flow field of positive feeder with different degrees of surface roughness are different, and different small vortices are generated at the concave-convex of the wire. The air flow characteristics near the wall of the positive feeder have changed greatly, and the influence on the aerodynamic characteristics of the wire is obvious.