On Study Of Aerodynamic Performance Of The Vertical-Axis Wind Turbine Rotor

The simulating accuracy of the mathematical models, the characteristic parameters of the rotor and the wind farm are important for the aerodynamic performance design and optimization of wind turbine. This thesis studies the above problems and has presented some ideas for improvement.The accuracy of the numerical model for predicting the aerodynamic performance of the rotor is the basic and pivotal component of the Vertical-Axis Wind Turbine's (VAWT) structural and general design. Stream-tube model and vortex model are the current mathematical models for rotor aerodynamic performance calculation. The stream-tube model is used in this thesis because of its celerity. According to the comparison of the calculation results obtained with the stream-tube model and the field test data of vertical-axis wind turbine prototype, the accuracy and limitation of the stream-tube model are analyzed in the thesis. The Gormont dynamic stall model and the added drag coefficient method are used to modify the steam-tube model, and the results of the reformative model are good agreement with the test data.The rotor aerodynamic performance of the vertical-axis wind turbine is dependence of the rotor type, blade solidity, blade section, tip-speed ratio and so on. In the aim of optimizing the rotor aerodynamic performance, detailed analysis of these factors is taken in this thesis.The rated power and rated speed are the two important parameters for depicting the performance of the wind turbine. For a given wind turbine, the yearly energy production is greatly effected by the rated speed, so the choice of the rated speed should take account of the wind farm characteristic.