扇形覆冰导线气动力特性及驰振不稳定性研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (11) : 82-85.

论文

扇形覆冰导线气动力特性及驰振不稳定性研究

马文勇1,2 顾明2

作者信息 +

Analysis on aerodynamic forces and galloping instability of sector-shape iced conductor

Ma Wen-yong1,2 Gu Ming1

Author information +

文章历史 +

摘要

采用刚性节段模型高频天平测力风洞试验测试了不同紊流度下的8种扇形覆冰导线气动力，依据DenHartog驰振机理分析了扇形覆冰导线的横风向驰振不稳定性，讨论了覆冰厚度、覆冰角度、紊流度对平均气动力特性及横风向驰振不稳定性的影响。结果表明：覆冰厚度的增大增强了气动升力，不同覆冰角度模型平均气动力系数随风向角的变化规律差别较大，紊流度的增高有助于减小覆冰导线承受的平均气动力；8种扇形覆冰导线在不同风向角下均有发生横风向驰振的可能，覆冰角度对驰振不稳定风向角位置及范围有较大影响，紊流度的增加提高了可能的驰振临界风速，因此高紊流度对驰振有一定的抑制作用。

Abstract

By applying high frequency balance technique on rigid section models in wind tunnel, aerodynamic forces of eight sector-shape iced conductor models were investigated in different turbulent intensity flows. Galloping instability of sector- shape iced conductors were predicted by DenHartog galloping criterion. The effects of ice thickness, ice angle, turbulent intensity on aerodynamic forces and galloping instability are also discussed. The results indicate: the aerodynamic lift force were reinforced due to increment of ice thickness, aerodynamic forces variation with wind direction are significant affected by ice angle, aerodynamic forces decreased as the turbulent intensity increasing. The cross wind galloping of eight models possibly occurs at different wind direction ranges which significant affected by ice shape. The occurrence of galloping will be prevented under high turbulent intensity because of the higher galloping criterion wind speed.

导出引用

马文勇;顾明. 扇形覆冰导线气动力特性及驰振不稳定性研究 [J]. 振动与冲击, 2012, 31(11): 82-85

Ma Wen-yong;Gu Ming. Analysis on aerodynamic forces and galloping instability of sector-shape iced conductor[J]. Journal of Vibration and Shock, 2012, 31(11): 82-85