Analysis Of Aerodynamic Characteristic And Optimal Design Of Resistance-type Vertical Axis Wind Turbine

Savonius wind turbine, invented by Savonius in the 1930s, is a typical resistance-type vertical axis wind turbine. Because of its low rotating speed, the rotor power coefficient of Savonius wind turbine is lower than other types of wind turbines, and the development is slow. However the S-type wind turbines have lots of advantages, such as simpler structure , lower cost, easy maintenance and installation, large staring torque and needless to use adjustable device. so more and more researchers have concerned about it in recent years.In this thesis, adoptive method mainly is numerical simulation method based on computational fluid dynamics. The aerodynamic performances of Savonius wind turbine were computed by finite volume method, and the optimization of S-type wind turbine have been done base on its computational results.The thesis includes three parts, one is simplification of geometric model and constructing the grid model, another is the influences of S-type wind turbine aerodynamic parameters to the aerodynamic performance of wind turbine, and the last is the optimization of S-type wind turbine. Adopting k-e model, the numerical calculation for S-type wind turbine can obtain the value of the rotor torque and torque coefficient in the different angles of attack .And the unsteady numerical calculation for S-type wind turbine can obtain the values of the power coefficient and torque coefficient in the different wind speeds and rotor speeds. Using these data, we can research the aerodynamic characteristics of S-type wind turbine, and can provides the important theoretical basis and data support for the optimal design of the S-type wind turbine.