Conductors with sector-shaped ice are susceptible to galloping. To prevent and control galloping, it is necessary to study the conductor aerodynamic characteristics. Wind tunnel tests were performed to study the influence of two shape parameters (ice thickness and ice angle) of a conductor with sector-shaped ice on the aerodynamic characteristics considering the roughness of the surface. In addition, the unstable areas for galloping are discussed according to Den Hartog theory and Nigol theory. The results show that with increasing ice thickness, the aerodynamic coefficient curves fluctuate more strongly, and galloping tends to occur; with increasing ice angle, the unstable area becomes larger according to Nigol theory, and the increasing drag coefficient will suppress the unstable areas according to Den Hartog theory. With the increasing two shape parameters, the most affected ranges of the aerodynamic coefficient curves are 150–180∘.

中文翻译：

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风洞试验研究扇形冰覆盖导体的气动特性和奔腾不稳定性

带有扇形冰的导体容易舞动。为防治舞动，有必要对导体气动特性进行研究。风洞试验研究了考虑表面粗糙度的带扇形冰的导体的两个形状参数（冰厚度和冰角）对空气动力学特性的影响。此外，根据Den Hartog理论和Nigol理论讨论了奔腾的不稳定区域。结果表明，随着冰层厚度的增加，气动力系数曲线波动较大，且容易出现飞驰现象；根据 Nigol 理论，随着冰角的增加，不稳定区域变大，根据 Den Hartog 理论，增加阻力系数将抑制不稳定区域。∘.