Analysis on aerodynamic forces and galloping instability of sector-shape iced conductor
Ma Wen-yong1,2 Gu Ming1
1Wind Engineering research center, Shijiazhuang tie dao University, Shijiazhuang, Hebei 050043, China;
2State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
Abstract:By applying high frequency balance technique on rigid section models in wind tunnel, aerodynamic forces of eight sector-shape iced conductor models were investigated in different turbulent intensity flows. Galloping instability of sector- shape iced conductors were predicted by DenHartog galloping criterion. The effects of ice thickness, ice angle, turbulent intensity on aerodynamic forces and galloping instability are also discussed. The results indicate: the aerodynamic lift force were reinforced due to increment of ice thickness, aerodynamic forces variation with wind direction are significant affected by ice angle, aerodynamic forces decreased as the turbulent intensity increasing. The cross wind galloping of eight models possibly occurs at different wind direction ranges which significant affected by ice shape. The occurrence of galloping will be prevented under high turbulent intensity because of the higher galloping criterion wind speed.