Wind-induced Response Analysis Of The Steel Tubular Tower For Horizontal Axis Wind Turbine

With the rapid development of wind power electricity industry,more large-scale and flexible structures of horizontal axis wind turbines(HAWT) tend to be applied in the wind power electricity industry area.When the wind-induced vibration exceeds the ultimate bearing capability of the tower structure for wind turbine,it will lead to structure damage.As a result,it is crucial to carry out further study on wind loads and wind-induced response of the tower structure for HAWT,which can provide theoretical value and direction for development and design of such kind of structures.The wind-resistant analysis of the tower structure for wind turbine is based on its dynamic characteristics.The Lanczos vector direct iteration method is used to investigate the natural vibration characteristics of the steel tubular tower structure for 600kW HAWT,considering the effect of wind rotor,engineroom and foundation stiffness.The natural frequency of structures establishes the foundation for wind-induced response analysis in the paper.Three-dimensional flow passing by a circular cylinder is simulated by ADINA with five turbulence models:κ-εmodel,RNGκ-εmodel,Wilcoxκ-ωmodel, SSTκ-ωmodel,and LES model.Numerical simulation results demonstrate LES model is more suitable for the wind-resistant analysis of high-rise structures.So LES model is employed to analyze the wind-induced response of the steel tubular tower structure for HAWT.Numerical simulation analysis of rigid and aero-elastic models is performed to research on the wind loads and wind-induced dynamic response of tower structures with cut-out speed,limited cut-out speed,and survival speed of wind turbines.The displacement wind-induced dynamic coefficient,pressure coefficient,drag coeffcient, and vortex shedding of wake flow behind the tower structure are obtained respectively. The conclusions are listed below:the trend and numerical value of wind pressure coefficients are coincident between rigid and aero-elastic models,and the absolute value of wind pressure coefficients detained from aero-elastic models is slightly larger. The incoming wind velocity has little influence on wind pressure,The drag coefficients increase with the elevation of the tower structure increasing.The wake flow behind the tower structure presents obvious three-dimension turbulence characteristics,and the increase of wind velocity enlarge the vertical disturbance range of the wake flow.The wind-induced dynamic coefficients are little influenced by the wind velocity and tower elevation.On the basis of the numerical analysis results,the wind-induced dynamic coefficient of the steel tubular tower structure for 600kW HAWT is suggested to be 1.7,which provides reference for the research and design development of the steel tubular tower structure for wind turbines.