Numerical simulation and analysis of dynamic aerodynamic characteristics of iced conductor

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (7) : 209-214.

In order to study the aerodynamic characteristics of galloping of iced conductor, based on software Fluent redevelopment, the user-defined function described the track of conductor galloping and dynamic mesh technology were used to realize the fluid and solid coupling from the weak coupled model. The aerodynamic coefficients of crescent iced conductor in the lateral vibration were calculated, and compared with the results from simulation that conductor in static and experiment；the effects of galloping amplitude, frequency and torsion vibration on the dynamic aerodynamic forces were analyzed. The results show that the dynamic aerodynamic coefficients are larger than that of static, and they have the same variation laws under the same wind speed. Drag and lift coefficients increase significantly with the galloping amplitude increasing, especially the lift coefficient multiplied. The frequency increase also makes the dynamic aerodynamic coefficients increasing, but the effect of frequency on the dynamic aerodynamic force is less than that of amplitude. Torsion vibration has a certain influence on the dynamic aerodynamic force. When the static aerodynamic coefficients are used to forecast of the critical wind speed of conductor break and tower loads caused by large span galloping in engineering, the results tend to unsafe. The effects of dynamic aerodynamic coefficients on galloping should not be ignored.

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Abstract

In order to study the aerodynamic characteristics of galloping of iced conductor, based on software Fluent redevelopment, the user-defined function described the track of conductor galloping and dynamic mesh technology were used to realize the fluid and solid coupling from the weak coupled model. The aerodynamic coefficients of crescent iced conductor in the lateral vibration were calculated, and compared with the results from simulation that conductor in static and experiment；the effects of galloping amplitude, frequency and torsion vibration on the dynamic aerodynamic forces were analyzed. The results show that the dynamic aerodynamic coefficients are larger than that of static, and they have the same variation laws under the same wind speed. Drag and lift coefficients increase significantly with the galloping amplitude increasing, especially the lift coefficient multiplied. The frequency increase also makes the dynamic aerodynamic coefficients increasing, but the effect of frequency on the dynamic aerodynamic force is less than that of amplitude. Torsion vibration has a certain influence on the dynamic aerodynamic force. When the static aerodynamic coefficients are used to forecast of the critical wind speed of conductor break and tower loads caused by large span galloping in engineering, the results tend to unsafe. The effects of dynamic aerodynamic coefficients on galloping should not be ignored.

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iced conductor / dynamic aerodynamic coefficient / galloping / numerical simulation

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ZHANG Zhe1,2, YANG Xiuping1,2，HAO Shuying2. Numerical simulation and analysis of dynamic aerodynamic characteristics of iced conductor[J]. Journal of Vibration and Shock, 2015, 34(7): 209-214

References

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