大风区接触网低风压正馈线设计及防舞有效性分析  

Design and analysis on anti-galloping effectiveness of low wind pressure AF wire of overhead catenary system in gale zone

作　　者：张友鹏[1] 张永丰 赵珊鹏 王思华[1] ZHANG Youpeng;ZHANG Yongfeng;ZHAO Shanpeng;WANG Sihua(School of Automatic&Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Rail Transit Electrical Automation Engineering Laboratory of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070 [2]兰州交通大学甘肃省轨道交通电气自动化工程实验室,甘肃兰州730070

出　　处：《铁道科学与工程学报》2022年第12期3494-3504,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51867013);兰州交通大学天佑创新团队计划(TY202010)。

摘　　要：兰新高铁大风区段接触网正馈线易在挡风墙影响下发生大幅舞动,造成线索疲劳断股,金具磨损加剧,危及行车安全。为探究低风压导线对于兰新高铁大风区段接触网正馈线无覆冰舞动的适应性,基于低风压导线运行机理,遵循低风压导线开发的关键要求和正馈线现场实际应用需求,设计一种适用于兰新高铁大风区段的低风压正馈线。基于流体力学的建立包含挡风墙与不同结构的低风压正馈线模型,利用仿真软件进行数值模拟计算,得出不同风载荷下不同结构低风压正馈线的气动力参数和周围流场,对比分析了低风压正馈线气动力系数与流场特性。结果表明:在整个测试风速范围内,中心角θ=45°的6种低风压正馈线的风阻力系数均小于常规正馈线,当凹槽半径与正馈线半径之比r/R=0.14时,低风压正馈线的防舞效果最显著,降阻率达到25.86%。然而低风压正馈线的降阻率与绞线表面粗糙度并不是严格呈正比例关系,r/R=0.15时正馈线的阻力系数大于r/R=0.14时的阻力系数,所以低风压正馈线设计的关键在于探寻合适的结构参数。气流在低风压正馈线模型背风面凹槽内产生小漩涡,气流与壁面摩擦产生起到反推作用的摩擦阻力,且小漩涡延缓了气流与壁面的分离,减小了负压区面积,在这种现象的影响下,低风压正馈线起到了降阻的效果。低风压正馈线可为大风区接触网附加导线的舞动防治提供重要参考。The Auto-transformer Feeder(AF) wire of the overhead catenary system(OCS) in the gale zone of the Lanzhou-Xinjiang high-speed railway is prone to galloping sharply under the influence of the windbreak wall,resulting in fatigue strand breakage of the thread, increased wear of the fittings, and endangering railway operation safety. To explore the adaptability of a low wind pressure conductor to the non-icing galloping of the AF wire of the OCS in the gale zone of the Lanzhou-Xinjiang high-speed railway, a low wind pressure AF wire suitable for the gale zone of Lanzhou-Xinjiang high-speed railway was designed based on the operation mechanism of low wind pressure conductor, following the key requirements of low wind pressure conductor development and the practical application requirements of AF wire on site. Based on the fluid mechanics, a low wind pressure AF wire model including windbreak wall and different structures was established. The numerical simulation calculation was carried out by using the simulation software. The aerodynamic parameters and surrounding flow field of low wind pressure AF wire with different structures under different wind loads were obtained. The aerodynamic coefficients and flow field characteristics of low wind pressure AF wire were compared and analyzed. The results show that the wind drag coefficients of the six low-pressure AF wires with center angle θ=45° are smaller than those of the conventional AF wire in the whole test wind speed range. When the ratio r/R of the groove radius to the AF wire radius is 0.14, the anti-galloping effect of the low-pressure AF wire is the most significant, and the drag reduction rate reaches 25.86%. However, the drag reduction rate of the low wind pressure AF wire is not strictly proportional to the surface roughness of the strand. The drag coefficient of the AF wire when r/R=0.15 is greater than the drag coefficient when r/R=0.14, so the key to the design of the low wind pressure AF wire is to explore the appropriate structural parameters. The airfl

关 键 词：大风区 正馈线舞动 低风压正馈线 风阻力系数 防舞有效性 

分 类 号：U225.1[交通运输工程—道路与铁道工程]