Study on aerodynamic control of vortex induced vibration of round steel tube in transmission tower
As a type of transmission tower with excellent mechanical properties,steel tubular tower is widely used in engineering.However,when the length of steel tubular tower is relatively large and tends to be arranged horizontally,the steel tubular rod is prone to vortex-induced vibration at low wind speed.In the long run,the continuous and repeated vibration may cause fatigue damage to the steel tubular tower members.Once the tower structure is damaged,it will directly threaten the stable operation of the power grid.In order to solve this problem,two vortic-induced vibration pneumatic control measures of spiral turbulence and passive blowing sleeve are studied by using large size true steel pipe and rod through wind tunnel test.The influence law of different spiral number and pitch on vortex vibration control effect is analyzed.The influence of different orifice thickness and orifice shape on vortex vibration control is analyzed.The results show that the effect of single-helix control is not so good.The three-helix control can reduce the vortex vibration by 97.7%at most,and the hollow-loop control can reduce the vortex vibration by 75.5%at most.In this paper,a full-size model is used to meet the Reynolds number demand and realize the study closer to the real environment of steel pipe in transmission tower,providing reference for the vorticity vibration suppression of steel pipe in practical engineering.
transmission towersteel pipevortex induced vibrationwind tunnel testhelixpassive blow sleeve ring
NETL
NSTL
万方数据
维普
