1520mm2大截面两分裂新月形覆冰导线空气动力特性试验研究

通过风洞试验的方法研究了1 520 mm~2大截面两分裂覆冰导线各子导线的静态气动三分力系数随不同分裂间距、不同覆冰厚度、不同风速及攻角下的变化规律。试验模型采用实际导线加工而成,具有实际导线的粗糙表明。试验结果表明:在攻角为0°~20°范围内,受尾流干扰的影响,下风向导线的CD系数要小于上风向子导线的CD系数。总体而言,试验范围内分裂间距对覆冰导线的气动力影响不明显;在重覆冰情况下导线的升力CL曲线和力矩CM曲线在攻角为0°~30°范围内会形成一种"突峰"现象;下游子导线在重覆冰情况下的抗风安全性问题值得关注;风速对大截面覆冰导线的力矩CM系数有较明显的影响。

Experimental Study on Aerodynamic Characteristics of 1520mm2 2-bundled large cross-section crescent shape iced conductors

By means of wind tunnel test, the variation of the static aerodynamic characteristics of 1520mm2 2-bundled large cross-section ice-coated conductors with different bundle spacing, ice thickness, wind speed and wind attack angle was investigated. The test models are made of the actual wires and have the real rough surface. Test results show that the CD of the interfered leeward conductor, is less than that of the windward concocter when the wind attack angle is in the range of 0°~20°.The bundle spacing in the range of the tests generally has litter influence on the aerodynamic coefficients. The CL curve and CM curve have a rapid peak in the range of 0°~30°when the conductors with heavy ice-coating. It is necessary to pay attention to the safety problem of wind-resistant under the condition of heavy ice-coating on the leeward conductor. Wind speed will significantly affect the CM coefficient of the large cross-section ice-coated conductors.