四分裂导线尾流驰振数值模拟研究

严波1,蔡萌琦1,吕欣2,周林抒1

(1.重庆大学工程力学系，重庆400044； 2.重庆大学土木工程学院，重庆400044)

摘要：利用风洞试验测量四分裂导线的空气动力系数，得到各子导线的空气动力系数随风攻角的变化曲线，表明尾流干扰对处于上风子导线尾流区的子导线的气动特性影响明显。给出利用ABAQUS有限元软件模拟分裂导线尾流驰振过程的方法，进而针对典型四分裂导线线路段，模拟得到包括整档舞动和次档距振动的尾流驰振现象，分析了整档舞动和次档距振动的特征，以及间隔棒不同布置方式和风速对尾流驰振的影响。

关键词：四分裂导线；空气动力特性；尾流驰振；数值模拟

中图分类号:TM753； O39文献标志码：A

Numerical simulation on wake galloping of quad bundle conductor

YANBo1,CAIMeng-qi1,LÜXin2,ZHOULin-shu1(1. Department of Engineering Mechanics, Chongqing University, Chongqing 400044, China; 2.College of Civil Engineering, Chongqing University, Chongqing 400044, China)

Abstract:Aerodynamic coefficients varying with the angle of attack were measured in wind tunnel tests. It is shown that the aerodynamic characteristics of a sub-conductor locating at the wake zone of another sub-conductor are apparently affected by the wake interference. The wake galloping including full span galloping and sub-span oscillation of a typical quad bundle conductor line was numerically simulated by means of ABAQUS software. The effects of mounted spacers with non-uniform and uniform arrangement schemes at different wind speeds on the wake galloping characteristics of the line were analyzed.

Key words:quad bundle conductor; aerodynamic characteristics; wake galloping; numerical simulation

双圆柱尾流干扰研究表明，上风圆柱的尾流区会形成两个不稳定的区域，一个近距失稳区和一个远距失稳区。前者约位于圆柱直径的1.5倍～6倍距离范围，后者约位于圆柱直径的10倍～25倍距离范围[1-2]。分裂导线子导线的间距正好使下风子导线处于上风子导线的远距失稳区中，可能引起分裂导线的气弹性失稳，诱发尾流驰振[3]。分裂导线的尾流驰振主要表现为次档距振动，并可能伴有整档舞动。尾流驰振发生时通常持续时间较长，易于引起导线、线夹、绝缘串和间隔棒等的疲劳破坏，对线路的安全运行形成严重威胁。

Tokoro等[2]利用风洞测试了双索在一定间距范围时的气动特性，并讨论了尾流驰振现象。陈政清等[4-5]针对桥梁吊杆和拉索的尾流驰振问题进行了研究。……