雾凇覆冰和雨凇覆冰导线气动力特性试验研究

Experimental Study on Aerodynamic Characteristics of Rime Icing and Glaze Icing Conductors

设计制作了3组不同覆冰厚度的表面光滑与表面粗糙的新月形覆冰导线刚性模型,以此来模拟导线雨凇和雾凇覆冰情况,进行了高频天平测力风洞试验,分析了光滑与粗糙覆冰导线气动力、风偏响应和舞动稳定性的关系与差异。试验结果表明:表面粗糙覆冰导线的阻力系数比表面光滑覆冰导线略大,且升力系数⁃攻角曲线和扭矩系数⁃攻角曲线不会出现尖峰;在相同覆冰厚度和覆冰形状下,雨凇形成的光滑覆冰导线气动稳定性较雾凇或混合凇形成的粗糙覆冰导线更差;在相同风速和线路条件下,粗糙覆冰导线的风偏响应较光滑覆冰导线更大,因此雾凇覆冰较雨凇对导线风偏更不利。

In order to simulate rime and glaze icing conditions,three sets of rigid models with different ice thick⁃nesses of crescent-shaped iced conductors with smooth and rough ice surface are designed and tested in the wind tunnel by high frequency balance.The relationship and difference in aerodynamic characteristics,wind-induced swing response and galloping stability are analyzed.Test results show that the drag coefficient of the iced con⁃ductor with rough ice surface is slightly larger than that with smooth ice surface,and the lift coefficient-attack an⁃gle curve and torsion coefficient-attack angle curve do not have sharp peaks.Under the same ice thickness and ice shape,the galloping stability of the iced conductor with smooth ice surface formed by glaze is worse than that with rough ice surface formed by rime and mixed rime.The wind-induced swing angle of iced conductor with rough ice surface is larger than that with smooth ice surface under the same wind velocity and line conditions,so that rime icing is worse than glaze icing for wind-induced swing of iced conductor.