Abstract
Wind tunnel tests were carried out to obtain the static aerodynamic characteristics of crescent iced 4-bundled conductors with different ice thicknesses, initial ice accretion angles, bundle spaces, and wind attack angles. The test models were made of the actual conductors and have a real rough surface. Test results show that the influence of wake interference on the drag coefficients of leeward subconductors is obvious. The interference angle range is larger than 20° and the drag coefficient curves of leeward subconductors have a sudden decrease phenomenon at some certain wind attack angles. The absolute value of the lift and moment coefficient increases with the increase of the ice thickness. In addition, the galloping of the iced subconductor may occur at the angle of wind attack near ±20° and the wake increases the moment coefficient. The variation of initial ice accretion angle has a significant influence on the aerodynamic coefficients. The aerodynamic coefficient curves exhibit a “moving” phenomenon at different initial ice accretion angles. The bundle spaces have a great influence on the moment coefficient of leeward thin ice-coated conductors. With the increase of ice thickness, the bundle spaces generally have little influence on the aerodynamic coefficients.
Highlights
The variation of initial ice accretion angle has a significant influence on the aerodynamic coefficients
Since the aerodynamic coefficients of icecoated conductors are the basis for the study of galloping, it is necessary to investigate the aerodynamic characteristics of the ice-coated conductors in ultrahigh voltage transmission lines
From the comparison of the measured drag coefficient of subconductor 1 with the results from [19], it can be seen that the two results are in good agreement at the wind attack angle of 0∘
Summary
Zhou et al [13] carried out a wind tunnel test to obtain the aerodynamic coefficients of the iced eight bundle conductor with crescent shape. Lou et al [18] carried out a wind tunnel test to investigate the influence of the initial ice accretion angle on the aerodynamic characteristics of D-shape 2-bundled and 6-bundled conductors. It gave the Den Hartog coefficients of D-shape bundled conductors with various initial ice accretion angles. Tests were carried out to obtain the variation laws of static aerodynamic characteristics of crescent iced 4-bundled conductors with different ice thicknesses, initial ice accretion angles, bundle spaces, and wind attack angles in the wind tunnel. The obtained results may provide the fundamental data for the development of antigalloping techniques of ice-coated 4-bundled conductors
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