【摘要】 当前，鲜有针对斜向风作用下的覆冰导线气动力及舞动特性的研究.通过引入仰角、斜角（偏航角）与风入射角的几何关系，推导了斜向风下导线阻力、升力、扭矩气动力表达式，该表达式严格考虑了导线运动过程中的相对风攻角、斜角及相对风速变化对气动力的影响；研制了倾角和攻角可调的天平连接装置，采用高频天平测力风洞试验获取了新月形覆冰导线在不同斜角下全风攻角的三分量气动力系数，结果表明：斜角的增大减低了阻力系数，但同时削弱了升力、扭矩系数随风攻角变化曲线的尖峰；从Den Hartog判定准则和系统等效阻尼比两个方面均反映出斜角的增大在一定程度上提高了导线舞动稳定性.对500 m档距新月形覆冰导线的不同斜角风入射工况进行舞动响应数值模拟，结果表明风速投影的计算方法仅在一定斜角范围（≤15°）内适用；斜角增大会显著降低气动负阻尼值，使得舞动发散速度降低、舞动幅值减小，同时存在一个临界斜角，使导线在受到大于此角度的斜向风时不会发生舞动.因此在设计线路时，减小线路走向与覆冰期主导风向的夹角可有效降低线路发生舞动的风险.更多还原

【Abstract】 There is little research on the aerodynamic force and galloping characteristics of iced conductors under skew wind. By considering the geometric relationship between elevation angle, yaw angle, and wind incidence angle, expressions for the aerodynamic forces(drag, lift, and torque) of conductors under skew wind were derived. These expressions accounted for the effects of relative attack angle, yaw angle, and relative wind speed changes on aerodynamic forces during the conductor’s motion. A balance connection device with adjustable tilt and attack angles was developed, and high-frequency balance wind tunnel tests were conducted to obtain the threedimensional aerodynamic coefficients in the full range of wind attack angles of a crescent-shaped iced conductor under different yaw angles. The results show that the increase of yaw angle reduces the drag coefficient, but simultaneously weakens the sharp peaks of the lift and torque coefficients versus the wind attack angle; Both Den Hartog criterion and the system’s equivalent damping ratio reflect that increasing the yaw angle improves the conductor’s galloping stability. Numerical simulations of galloping responses for a 500 m span crescent-shaped iced conductor under different yaw angles show that the wind speed projection method is only applicable within a limited range of yaw angles （≤15°）； Increasing the yaw angle significantly lowers the aerodynamic negative damping value, thereby reducing the galloping divergence speed and amplitude. Moreover, there exists a critical yaw angle beyond which the conductor will not gallop under skew winds exceeding this angle. Therefore, in line design, reducing the angle between the line direction and the dominant wind direction during the ice-covered period can effectively reduce the risk of galloping.更多还原