Simulation And Analysis Of The Blade Shape Of Savonius VAWT

With the development of the recycle resource, wind power becomes one of the most important renewable resources in the world, especially when the environment is badly polluted and the conventional resource is drying up. More and more attention is being paid to the wind energy for its particular merits, which is recognized by the whole world by its cleanness and recycle characteristics.Blade is one of the most important components of the wind turbine, the shape of which greatly affects the power coefficient of the wind turbines. The paper studied the design model, performance characteristics and dynamics analysis of the blades of the Savonius wind turbines. The main conclusions are as follows:1. The design of the blades of the wind turbines(1) The discussion of the universal method of the blade design. Synthesizing with the multiple methods of blade design in the world, a simple and effective way to design non-traditional wind turbine blades basing on existing blade design theory has been achieved. The way is to use the mechanics design software CATIA to model the shape of the blade, which is simulated and analyzed in a fluid engineer simulation software FLUENT. The method can be applied in multiple special type of blade shape design and quite effective results can be achieved in most of times.(2) Precise model of the blade design. With the mechanics design software CATIA, basing on traditional Savonius blades, the blades' shape is designed and the target of the output power is 80w. The multiple shapes of the blades of the wind turbines can be achieved through the software CATIA, which is of great function in shape design, especially in surface design. To the complex blades, the boundary curve can be defined by the method of fixing the key points, which can provide important information to the further dynamics analysis of the blades. The modeling method is a good example to the blades of the twisted-bladed Savonius wind turbines and other complex entity modeling which needs precise design. The method is applicable for the design of multiple shape, and increase the applied area of the blade design method.2. The dynamics analysis of the blade. The wind tunnel was designed to simulate the air flow alongside the wind turbine which resembles the real wind situation to a large extent. The fluid engineer simulation software FLUENT was used to simulate the real wind situation, and the finite element analysis method was used to analyze. The velocity vectors, the pressure coefficient alongside the blade and the applied forces distribution situation alongside the blades were achieved through the 2-dimension simulation, 3-dimension simulation before and after the optimization. The blade with a better dynamics performance was recognized finally, which provides the information of great reference value to the further research to the blades of wind turbines of multiple types.