中文摘要：

在特定风雨条件下，分裂输电导线会发生剧烈的风雨致振现象，这种振动会造成子导线间碰撞、鞭击、断线及倒塔等事故。为揭示分裂输电导线风雨振动机理，对含雨线的二分裂输电导线尾流场气动力特性进行CFD数值计算，获取背风子导线气动力系数随雨线位置变化曲线；建立背风子导线风雨致振理论分析模型，将CFD计算所得气动力系数曲线代入该模型并应用有限单元法和中心差分法进行数值求解，详细分析了雨线位置角对动力背风子导线振动特性的影响。研究表明，上雨线振荡是诱发背风子导线风雨致振的主要诱因，其振动特性明显区别于分裂输电导线的尾流驰振。

英文摘要：

Under some rain-wind conditions, severe vibration may occur for bundled conductors. This type vibration can potentially lead to fatigue fractures of conductors and fatigue failures of spacers, and threaten the safety and serviceability of high-voltage transmission lines. In order to reveal the mechanism of the rain-wind induced vibration for the bundled conductors, a series of 2-dimensional CFD models of twin bundled conductors with rivulets are computed and thecurves of aerodynamic coefficients vs. the positions of the upper rivulet are obtained. The effect of the leeward conductor aerodynamic shielding caused by the forward conductor and the aerodynamic characteristics caused by the upper rivulet are analyzed. Correspondingly, a 2- dimensional 3-DOF analytical model of the leeward conductor is established for the rainwind induced vibration analysis. By contrast with wake-induced vibration of leeward conductors, effect of the upper rivulet’s motion on vibration amplitude is studied based on finite element method and Newmark method. The results indicate that the upper rivulet’s motion is the main reason for the rain- induced vibration, and the vibration characteristic is obviously different from the wake-induced vibration.