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Keywords

bundled conductor, drag coefficient, interference effect, wind tunnel test, numerical simulation

Abstract

To study the variation law of drag coefficient for the bundled conductor with the wind attack angle and splitting distance, the CFD numerical simulation method is employed to study the drag coefficient variation law with the wind direction angle of drag reduced conductor under different splitting numbers and spacing. A model test is carried out in the boundary-layer wind tunnel for a 90-cm conductor. Under different wind attack angles, the drag coefficient variation of the drag reduced conductor, concerning Reynolds number and interference effect, are obtained and then compared with numerical simulation results. Research results show that the interference effect of the multi-bundled conductor drag coefficient is noticeable, and the average drag coefficient can be reduced by more than 20% with the increase of splits. The multi-bundled conductor drag coefficient varies obviously with the wind attack angle. The peak value of the wind drag coefficient will appear in the case of windage yaw. The peak value of 2-bundled conductor appears at a wind attack angle of 18°~24°, and the peak value of 4-bundled conductor appears at a wind attack angle of 22.5°~30°. The wind load design of bundled conductors should consider the adverse influence of windage yaw and the interference effect.

DOI

10.19781/j.issn.1673-9140.2022.01.022

First Page

186

Last Page

192

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