湖南大学学报（自然科学版）2025，Vol.52Issue(12)：67-76,10.DOI:10.16339/j.cnki.hdxbzkb.2025227
斜向风作用下覆冰导线气动力及舞动特性研究
Study on the Aerodynamic Force and Galloping Characteristics of Iced Transmission Lines under Skew Wind
摘要
Abstract
There is little research on the aerodynamic force and galloping characteristics of iced conductors under skew wind.By considering the geometric relationship between elevation angle,yaw angle,and wind incidence angle,expressions for the aerodynamic forces(drag,lift,and torque)of conductors under skew wind were derived.These expressions accounted for the effects of relative attack angle,yaw angle,and relative wind speed changes on aerodynamic forces during the conductor's motion.A balance connection device with adjustable tilt and attack angles was developed,and high-frequency balance wind tunnel tests were conducted to obtain the three-dimensional aerodynamic coefficients in the full range of wind attack angles of a crescent-shaped iced conductor under different yaw angles.The results show that the increase of yaw angle reduces the drag coefficient,but simultaneously weakens the sharp peaks of the lift and torque coefficients versus the wind attack angle;Both Den Hartog criterion and the system's equivalent damping ratio reflect that increasing the yaw angle improves the conductor's galloping stability.Numerical simulations of galloping responses for a 500 m span crescent-shaped iced conductor under different yaw angles show that the wind speed projection method is only applicable within a limited range of yaw angles(≤15°);Increasing the yaw angle significantly lowers the aerodynamic negative damping value,thereby reducing the galloping divergence speed and amplitude.Moreover,there exists a critical yaw angle beyond which the conductor will not gallop under skew winds exceeding this angle.Therefore,in line design,reducing the angle between the line direction and the dominant wind direction during the ice-covered period can effectively reduce the risk of galloping.关键词
输电线路/覆冰导线/风洞试验/斜风作用/气动力/舞动Key words
electric lines/iced conductor/wind tunnels/skew wind/aerodynamic force/galloping分类
信息技术与安全科学引用本文复制引用
吴蕙蕙,楼文娟,苏凌峰,王强..斜向风作用下覆冰导线气动力及舞动特性研究[J].湖南大学学报（自然科学版）,2025,52(12):67-76,10.基金项目
国家自然科学基金资助项目(51838012),National Natural Science Foundation of China(51838012) （51838012）
