双分裂导线尾流驰振的数值模拟

Numerical Simulation on Wake-induced Flutter of Double Bundle Conductor

利用计算流体动力学(CFD)方法对双分裂导线在均匀来流作用下的气动力与流场特性进行数值模拟计算,研究得到各子导线的气动力系数,以及背风侧子导线气动力系数随其与迎风侧子导线相对位置的变化曲线。同时采用两节点索单元模拟导线,梁单元模拟间隔棒,建立双分裂导线的尾流驰振数值模拟的有限元模型,并基于CFD方法数值模拟得到的各子导线气动力参数建立双分裂导线的气动力模型;利用Ruange-Kutta显示积分法对其动力方程进行非线性数值求解,得到其尾流驰振的动力响应。最后以某实际工程中双分裂导线为例,研究间隔棒布置、分裂导线倾角以及风速对分裂导线尾流驰振的影响。上述结论可为双分裂导线的防振设计与研究提供参考。

The computational fluid dynamics(CFD) method was adopted to investigate the numerical simulation of aerodynamic force and the flow field characteristics of double bundle conductors under uniform incoming flow. The aerodynamic force coefficient of sub-conductor was obtained. In addition, the variation of aerodynamic force coefficient of leeward sub-conductor with its position relative to windward sub-conductor was studied. At the same time, the finite element model of bundle conductor for wake-induced flutter analysis was established with the two-node cable element and beam element. And the aerodynamic model of the double bundle conductors was established based on the sub-conductor aerodynamic parameters obtained by CFD simulation. The Runge-Kutta method was applied to carry out nonlinear numerical simulation and the dynamic response of double bundle conductor was obtained. Finally, the influence factors of spacer arrangement, inclination angle of bundle conductor and wind speed on wake-induced flutter of double bundle conductor were investigated with a practical project. These conclusions can provide references for the vibration prevention design and research of double bundle conductor.