覆冰四分裂导线的气动特性与舞动特性
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TM752

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Wind Tunnel Test and Galloping Characteristics of Iced Four-Bundle Conductor
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    摘要:

    首先进行了覆冰四分裂导线风洞试验,得到了覆冰四分裂导线的气动力系数,接着采用等效替代法得到了覆冰四分裂导线中心轴的等效气动力系数,再结合Den-Hartog横向驰振机理分析了覆冰四分裂导线等效气动力系数的稳定区。推导了两自由度的空气动力系数三次拟合曲线表达式,再结合风洞试验所得的气动系数研究了导线的舞动特性。试验结果表明:由于尾流效益的存在,相同材料的子导线气动力系数却存在明显的差异,因此考虑四分裂导线某一根导线的舞动特性并不能反映整体四分裂导线的舞动特性。舞动特性研究结果表明:振动开始主要以z轴方向的位移为主,随后由于导线受到负斜率的空气动力,y轴方向的位移慢慢增加,振动稳定后y轴方向的位移远大于z轴方向的位移,点的运动轨迹近视为椭圆。

    Abstract:

    Firstly, wind tunnel test of iced quad bundle conductor are carried out, and the aerodynamic coefficients of iced quad bundle conductor are obtained. Then the equivalent aerodynamic coefficients at the central axis of iced quad bundle conductor are obtained by equivalent substitution method. Then, the stable region of the equivalent aerodynamic coefficients of iced quad bundle conductor is analyzed by combining the Den-Hartog galloping mechanism . The cubic fitting expression about aerodynamic coefficients with 2-DOFs is derived, and the galloping characteristics of iced quad bundle conductor are studied by combining the aerodynamic coefficients obtained by wind tunnel test. The experimental results show that the aerodynamic coefficients of each sub-conductor with the same material are obviously different due to the existence of wake effects. Therefore, considering the galloping characteristics of a sub-conductor of quad bundle conductor cannot reflect the galloping characteristics of the whole quad bundle conductor. The results of galloping characteristics show that the displacement in the z-axis direction is dominant at the beginning of the vibration, and then the displacement in the y-axis direction increases slowly due to the negative slope of the aerodynamic loads on the conductor. The displacement in the y-axis direction is much larger than the displacement in the z-axis direction after the vibration is stabilized, and the trajectory of the point could be regarded as an ellipse.

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闵光云,刘小会,严波,等. 覆冰四分裂导线的气动特性与舞动特性[J]. 科学技术与工程, 2020, 20(21): 8607-8615.
MIN Guangyun, 刘小会, YAN Bo, et al. Wind Tunnel Test and Galloping Characteristics of Iced Four-Bundle Conductor[J]. Science Technology and Engineering,2020,20(21):8607-8615.

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  • 收稿日期:2019-10-14
  • 最后修改日期:2020-05-28
  • 录用日期:2020-01-07
  • 在线发布日期: 2020-08-18
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