三维D形变截面覆冰四分裂导线气动力特性研究  

Aerodynamic characteristics of ice-covered four-splitted conductors with three-dimensional D-shaped cross-section

作　　者：冯文斌 虢韬 王刚[2] 杨刘贵 王璐[2] 祝贺[2] Feng Wenbin;Guo Tao;Wang Gang;Yang Liugui;Wang Lu;Zhu He(Transmission and Maintenance Branch of Guizhou Power Grid Co.,Ltd.,550002,Guiyang,China;Graduate School,Northeast Electric Power University,132012,Jilin,China)

机构地区：[1]贵州电网有限责任公司输电运行检修分公司,贵阳550002 [2]东北电力大学研究生院,吉林132012

出　　处：《应用力学学报》2021年第4期1725-1733,共9页Chinese Journal of Applied Mechanics

基　　金：吉林省科技发展计划项目(20180201016SF);贵州电网有限责任公司输电运行检修分公司输电线路直流融冰短接操控系统研究与应用(2018220202000)。

摘　　要：为了研究分裂导线不均匀覆冰对导线气动力特性的影响,利用Fluent中的sst k-w湍流模型对三维D形变截面覆冰四分裂导线绕流模型进行模拟分析;监控覆冰厚度最大和最小单元的气动力参数,获得全攻角下各单元的阻力和升力系数及子导线全单元阻力和升力系数时程曲线,并以DenHartong驰振理论为依据,研究变截面覆冰分裂导线的振动可能性。结果表明:沿分裂导线Z方向截面流场分布差异较大,且每个截面的压力区域压力和速度区域速度有明显不同;同时Y方向截面压力和速度云图表现为非均匀分布,说明三维变截面覆冰四分裂导线具有明显的流动特性。随着覆冰厚度增加,迎风面D形覆冰导线各单元阻力系数最大值增大18.2%,但升力系数最大值减少22.2%;受迎风面子导线尾流影响,背风面子导线阻力系数最大值和最小值的风攻角分别延后20°、10°。D形覆冰四分裂导线各子导线升力系数最大值和最小值出现的风攻角没有受到分裂导线尾流的影响,仍在70°攻角取得最小值,120°攻角取得最大值;在120°~180°风攻角范围内,随着攻角增加,升力系数呈现明显下降趋势。在0°~180°攻角范围内,各单元阻力系数值均大于0,升力系数值在60°~80°攻角下小于0,由驰振理论知,在60°~80°攻角范围内变截面覆冰导线可能出现驰振。For study the influence of non-uniform icing on the aerodynamic characteristics of the split conductor,the SST k-w turbulence model in fluent is used to simulate the flow around the four-split conductor with a 3-d deformed section of icing.By monitoring the aerodynamic parameters of the units with the maximum and minimum icing thickness,the drag and lift coefficients of each unit and the time history curves of the drag and lift coefficients of the whole sub-conductor at the angle of full attack are obtained.Based on Den Hartong galloping theory,the galloping possibility of the ice-covered split conductor with variable section is studied.Results show that the flow field characteristics of the conductor are greatly affected by the non-uniform icing.With the increase of ice cover thickness,the aerodynamic characteristics of different units of the d-shaped ice-covered quadruple split conductor are different,and the fluctuation amplitude of lift and drag coefficient time history curve increases.The aerodynamic parameters of leeward conductors are affected by the wake generated by windward conductors with different icing thicknesses.Each unit with different ice thickness has different galloping characteristics,which may occur in the ice-covered split conductor,and the aerodynamic characteristics of the conductor are greatly affected by the ice-covered variable section.

关 键 词：变截面 分裂导线 覆冰 气动力参数 尾流 

分 类 号：TM751[电气工程—电力系统及自动化]