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

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (11) : 82-85.

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

Ma Wen-yong1,2 Gu Ming1

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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.

Key words

wind tunnel test / sector-shape iced conductor / aerodynamic force / galloping instability / turbulent intensity

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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