不同初凝角下D形覆冰分裂导线气动力特性

通过刚性节段模型高频测力天平测力风洞试验,对D形覆冰二分裂和六分裂导线模型进行了13组不同工况的试验,测得了在不同初凝角下分裂导线整体和60°初凝角下各子导线的气动力系数,攻角范围为0°~360°,并以5°为各攻角间隔,基于邓哈托准则,对D形覆冰分裂导线的驰振稳定性进行分析。试验结果表明：初凝角对覆冰分裂导线气动力特性及驰振稳定性存在影响;在一定风攻角下,子导线尾流干扰对气动力特性影响显著,增大了导线的驰振不稳定性。所得试验结果为D形覆冰二分裂和六分裂导线的舞动分析及其防治技术提供了必要的气动力数据。

Aerodynamic Characteristics of D Shape Iced Bundled Conductors with Different Initial Attack Angles

By applying high frequency force balance technique on rigid section models in wind tunnel,the models of 2- bundle and 6-bundle D shape iced conductor in 13 different cases were tested. The static aerodynamic coefficients of the models,including the whole aerodynamic characteristic of different initial attack angle and each aerodynamic characteristic of sub-conductor in 60° attack angle,were obtained from 0° ~ 360° by every 5° in wind tunnel test. Then the galloping stability of D shape iced conductor was analyzed based on the Den Hartog criterion. The test results show that the initial attack angle has impact on the aerodynamic characteristic and galloping stability of iced conductor. However,the wake interference around sub-conductors on aerodynamic characteristic is obvious under certain wind attack angles,furthermore,it improves the galloping instability. The obtained test results can provide basic aerodynamic data for the analysis and prevention technology of galloping of 2-bundle and 6-bundle D shape iced conductors.