Abstract:

By applying high frequency force balance technique on rigid section models in wind tunnel, the models of 2-bundle and 6-bundle D shape iced conductor in 13 different cases were tested. The static aerodynamic coefficients of the models, including the whole aerodynamic characteristic of different initial attack angle and each aerodynamic characteristic of sub-conductor in 60° attack angle, were obtained from 0°～360° by every 5° in wind tunnel test. Then the galloping stability of D shape iced conductor was analyzed based on the Den Hartog criterion. The test results show that the initial attack angle has impact on the aerodynamic characteristic and galloping stability of iced conductor. However, the wake interference around sub-conductors on aerodynamic characteristic is obvious under certain wind attack angles, furthermore, it improves the galloping instability. The obtained test results can provide basic aerodynamic data for the analysis and prevention technology of galloping of 2-bundle and 6-bundle D shape iced conductors.

Key words: D shape iced conductor, bundled conductors, initial attack angle, sub-conductors, aerodynamic characteristic, galloping