Analysis Of Aerodynamic Loads And Dynamic Characteristics On The Vertical-Axis Wind Turbine

Following the large development and technological improvement of the wind turbine, the vertical-axis wind turbine has been paid common attention to increasingly by many countries due to the advantages of structure and performance in comparison with horizontal-axis wind turbine recently. The vertical-axis wind turbine has become one of main research tendency for wind power development in the future. This thesis aimed to the research about structure form of whole wind turbine and its components, the calculation of aerodynamic loads and the analysis of dynamic characteristics.The prediction of aerodynamic load's using aerodynamic theory is the basis of wind turbine design and dynamic analysis. Firstly Single Disk Multiple Stream-tube model and Double Disks Multiple Stream-tube model are introduced. Then SDMT model is adopted to calculate the aerodynamic loads and summarize the movement law in this thesis because of its simplicity and swiftness.As for the analysis of dynamic characteristic, the effect of dynamic stiffening on wind turbine is presented through modal analysis of vane, rotor system and whole wind turbine by considering the dynamic stiffening in the rotation condition. Then the Campbell chart is plotted to determine the resonance point according to the relation between rotate speed and frequency, which provide the reference for the relevant parameters of resonance.The transient dynamic response of wind turbine is analyzed with the aerodynamic loads on vanes under the rated rotate speed and the corresponding displacement response curves is plotted, which become the basis of the structure intensity and fatigue analysis of the wind turbine.