Aerodynamic and Vibration Characteristics of Iced Power Transmission Conductors in a Nonuniform Wind Field Based on Unsteady Theory

Guifeng Zhao, Qingyang Li, Xiuyao Li and Meng Zhang ()
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Guifeng Zhao: School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
Qingyang Li: School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
Xiuyao Li: School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
Meng Zhang: School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

Energies, 2025, vol. 18, issue 3, 1-40

Abstract: To study the aerodynamic and vibration characteristics of iced conductors under the influence of wind fluctuations, a harmonic superposition method is used to simulate nonuniform wind speeds. A user-defined function is written on the basis of the secondary development function of the Fluent 2021 R1 software to determine the displacement and velocity of the conductor at each time step, and a two-way fluid–structure interaction (FSI) numerical simulation of an iced conductor under a nonuniform wind field is performed via an overset mesh method. In the analysis, the aerodynamic coefficients and galloping characteristics of iced conductors under different degrees of freedom (DOFs) are investigated by considering different combinations of quasi-steady theory, unsteady theory, a uniform wind field, and a nonuniform wind field. The results show that in a nonuniform wind field, the mean, standard deviation (SD), and peak values of the drag and torsion coefficients of the conductors calculated via unsteady theory are significantly larger than those calculated via quasi-steady theory, indicating that the obtained aerodynamic coefficients of the latter (the mean values are typically used) conceal the characteristics of the iced conductors in an actual wind environment and ignore the adverse effects of the variability.

Keywords: iced conductor; nonuniform wind field; unsteady theory; aerodynamic coefficient (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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