NUMERICAL SIMULATION ON THE AERODYNAMIC FORCE OF THE ICED CONDUCTOR FOR DIFFERENT ANGLES OF ATTACK

摘要

According to the galloping mechanism of iced conductors, the aerodynamic simulations were performed based on actual wind tunnel tests. Aeroelastic models of single and bundled conductors with a typical ice-coating section forms (crescent section) were set up. The simulation results were in good agreements with wind tunnel tests, and it showed that numerical simulation method can be used instead of wind tunnel tests. The wind attack angles have seriously affected the aerodynamic force of the iced conductor. The wake of vortex shedding for the iced single conductor was analyzed. As for the iced bundled conductors, sub-conductors at the downstream were seriously influenced by the ones at the upstream locations, and the aerodynamic force of the sub-conductors at the downstream was lower than of those at the upstream. The negative slope of Nigol coefficient to the bundled conductors was larger than that of the single wire, but the absolute value of the amplitude was less than that of the single conductor, and the bundled conductors were more likely to gallop than the single ones. The Den. Hartog and O.Nigol mechanism were used to predict galloping of iced conductors, which can be convenient for analyzing vibration of iced conductors.