Study On Flow Control For Wind-induced Vibration Of A High-rise Chemical Tower

Chemical tower belongs among high-rise structures whose stiffness and damping is so low that it is prone to vortex-induced vibration(VIV).The VIV greatly threatens the normal service and the durability performance of chemical tower,causing damage to property.Therefore,it is of great significance to study the wind effect on the chemical tower and put forward methods to control the wind-induced vibration.In present paper,a passive control method is proposed to suppress wind-induced vibration of chemical tower by using hollow ring pipe and ribs.In this item,the rigid model of an 80-metre high chemical tower was designed.The wind tunnel tests are conducted to investigate the control effects and influencing factors of flow around the chemical tower model.The main contents are included as follows:Firstly,aerodynamic forces around the model with and without control are measured with a six-component balance,then the optimum parameters include the hollow pipe spacing,hollow pipe position and staggered angle between two adjacent circular ribs of flow control are studied.Second,PIV technique is employed to investigate the effect of hollow pipe spacing on flow control and analyze the flow suppression mechanism.The flow characteristics of the time-averaged streamline,Turbulent Kinetic Energy(T.K.E),the vorticity field and swirling strength field are analyzed.Finally,the hollow ring pipes with self-suction and self-blowing holes were applied to the extractive distillation tower(T1301)of Daqing Sanju Energy Purification Limited Company.The wind-induced vibration of the tower is suppressed rapidly.The observation results show that the wind-induced displacement amplitude of T1301 reduced from 0.5 meter to 0.1 meter.