准椭圆形覆冰导线气动力特性试验研究

Testing Study on Aerodynamic Force Characteristics of Quasi-oval Shape Iced Conductor

摘要:

通过刚性节段模型高频天平测力风洞试验，对圆形截面、裸导线截面及6种不同类型的准椭圆形覆冰导线气动力特性进行了研究，讨论了紊流度、风向角、覆冰饱满度、覆冰厚度等因素对导线气动力特性的影响以及准椭圆覆冰导线驰振稳定性的一般规律.结果表明，紊流度的增加使得模型力系数绝对值在一定范围内变小；覆冰形状和风向对导线气动力特性有很大影响;准椭圆形覆冰导线一定风向角范围内存在驰振可能.试验得到的数据和结论可以为这类覆冰导线的风致响应计算及破坏机制的分析提供基础数据.

Abstract:

By applying high frequency balance technique on rigid section models in wind tunnel,aerodynamic force characteristics of cylinder,bare conductor and six quasi-oval shape iced conductor models were investigated in different turbulence intensities and wind directions.Galloping instability of quasi-oval shape iced conductor models were also studied.The analysis shows that absolute values of the force coefficients decrease with the increasing turbulence intensities and the shape of the iced conductors,wind directions have great influences on the force coefficients acting on the conductors and galloping of quasi-oval shape iced conductors can occur in some wind direction.The results could be used as the basis of analysis of their wind induced response and failure mechanism.