随机风场中覆冰四分裂导线舞动数值模拟

摘 要: 采用数值方法研究覆冰四分裂输电导线在随机风场中的舞动问题。考虑风速随高度的变化和空间相关性，数值模拟得到随机风场，并利用典型覆冰四分裂导线空气动力系数随攻角的变化，确定作用于覆冰导线上的空气动力载荷，模拟研究不同档距覆冰四分裂导线的舞动。结果表明，随机风场中小档距导线的舞动模式与稳定风情况一致，而大档距时则不同，可能出现更高阶的舞动模式。因此，在研究大档距覆冰导线舞动时，考虑风场随机性是必要的。

Numerical investigation on galloping of iced quad bundle conductor in stochastic wind field

Abstract: Galloping of iced quad bundle conductor in stochastic wind field is numerically investigated by means of the finite element method. The variation of wind velocity with the height above the ground and the space correction between any two points are taken into account in the simulation of stochastic wind field. The aerodynamic loads on the iced conductor are determined based on the aerodynamic coefficients varying with angle of attack obtained by wind tunnel test. It is shown from the numerical results that the galloping mode of transmission line with smaller span in stochastic wind field is consistent with that in steady wind, but the galloping mode of transmission line with larger span is different from that in steady wind filed. Therefore, it is necessary to investigate the galloping behavior of iced transmission lines with large span in stochastic wind field for the design of anti-galloping device.