摘要
模拟新月形覆冰四分裂导线在风载荷作用下导线的扰流场,计算得到各子导线气动力系数随风攻角的变化规律,此规律与风洞试验所得规律一致.分析了子导线的尾流效应对气动力系数的影响规律,发现尾流效应对子导线气动力系数的影响规律不同.将模拟所得各子导线气动力系数换算为整体气动力系数加载到超高压输电线路的有限元模型,模拟线路的整体舞动.通过对不同初始风攻角下导线的位移响应、舞动轨迹和舞动频谱分析,发现初始风攻角为70°和100°时覆冰四分裂导线发生大幅舞动,不同的风攻角下舞动幅值及轨迹不同,但舞动模式均为垂直方向的一个半波舞动.所得结果对覆冰四分裂导线的舞动防治技术有重要的参考价值.
The variation of the aerodynamic coefficient of each sub-conductor with the wind angle of attack is calculated by simulating the spoiler field of the crescent iced quad bundle conductor under the wind load.This law is consistent with the wind tunnel test.The influence of wake effect on aerodynamic coefficients of sub-conductors is analyzed.It is found that the influence is different.The aerodynamic coefficients of each sub-conductor are converted into integral aerodynamic coefficients and loaded into the finite element model of EHV transmission line to simulate the whole galloping of the line.Through the displacement response,galloping trajectory and galloping frequency spectrum analysis of the wires under different initial wind angle of attack,it is found that the iced quad bundle conductor is greatly galloping when the initial wind angle of attack is 70°and 100°.And the galloping amplitude and trajectory are different under different wind attack angles,but the galloping mode is a half-wave galloping in the vertical direction.The results obtained have important reference value for the galloping prevention technology of iced quad bundle conductor.
作者
向玲
张悦
唐亮
XIANG Ling;ZHANG Yue;TANG Liang(Mechanical Engineering Department,North China Electric Power University,Baoding 071003,Hebei,China)
出处
《中国工程机械学报》
北大核心
2019年第4期297-303,共7页
Chinese Journal of Construction Machinery
基金
国家自然科学基金资助项目(51675178)
关键词
四分裂导线
气动力系数
数值模拟
有限元
舞动
quad bundle conductor
aerodynamic coefficients
numerical simulation
finite element
galloping
