Effects of Ice Surface and Ice Shape on Aerodynamic Characteristics of Crescent-Shaped Iced Conductors
Publication: Journal of Aerospace Engineering
Volume 34, Issue 3
Abstract
In current galloping studies, the shape and surface of ice accretion are usually simplified to the regular and smooth properties, although they have the probability of irregularity and roughness in real conditions. To study the effect of these two factors on galloping stability, high-frequency force balance (HFFB) wind tunnel tests were conducted to obtain the aerodynamic characteristics of crescent-shaped iced conductor models with different ice surface roughness and ice shape. Furthermore, based on the Den Hartog and Nigol galloping mechanisms, the differences of galloping stability judgment are analyzed. Finally, a finite-element numerical simulation is also conducted to compare the galloping properties of iced conductors with rough and smooth surfaces. The results show that ideal crescent-shaped iced conductors with smooth ice surfaces are more prone to galloping compared with the rough ice surface condition, which is also verified by the results of the finite-element numerical simulation. Additionally, irregularities of the ice shape will result in a decrease of Den Hartog and Nigol coefficients in the negative value range, which means it is more likely to lead to the galloping phenomenon.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are proprietary or confidential in nature and may only be provided with restrictions.
The aerodynamic coefficients obtained from the wind tunnel test are for the project of National Natural Science Foundation of China, and may only be provided with restrictions.
Acknowledgments
The work described in this paper was supported by the National Natural Science Foundation of China (Project Nos. 51838012 and 51678525).
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Published In
Journal of Aerospace Engineering
Volume 34 • Issue 3 • May 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jun 12, 2020
Accepted: Oct 20, 2020
Published online: Jan 22, 2021
Published in print: May 1, 2021
Discussion open until: Jun 22, 2021
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