Aerodynamic Design And Performance Calculation Of Wind Turbine Blade

As a kind of green renewable energy, wind energy has received widespread attention from all over the world. The horizontal axis wind turbine(HAWT) is the most important form of wind energy utilization. In wind turbine design, the blade as one of the key components which aerodynamic shape plays a decisive role in determining wind energy capacity of the wind turbine. Therefore, the research of wind turbine blade design is of great significance to the more efficient use of wind energy and resource conservation.Using 1.5MW HAWT as the object, based on blade element momentum theory(BEM), the blade aerodynamic calculation model has been established, and the aerodynamic shape design of the blade was carried out by using MATLAB program, blade profile parameters are obtained; in order to obtain the geometrical parameters of the blade at any position, self compiled program to achieve the shape parameters of blade automatic polynomial fitting correction and linear correction, the program can be achieved for blade aerodynamic performance calculation; through the comparison of the calculation results, the polynomial fitting correction is more advantageous for gaining high performance blades.In order to reduce the computation time, the unified format of blade geometry data file has been used to combine aerodynamic shape design program with performance calculation program. Keeping design results unchanged, the effect of the number of blade element on the aerodynamic performance has been studied. The results show that the optimal number of blade element is 35.Aiming at the uniform selection of blade element is not good for improving the aerodynamic performance of the blade, this paper presents a method to design the aerodynamic shape of blade of the non uniform selection of blade elements. The example shows that the higher the tip speed ratio is, the more obvious the improvement of power factor of blade obtained by the method. This conclusion is of engineering significance to further improve the aerodynamic performance of the blade.With the help of three-dimensional modeling software, 3D solid model of blade has been established, and it was imported into the computational fluid dynamics(CFD) software CFX. The numerical simulation of the flow field of wind turbine blade design is carried out. Through the analysis of the power coefficient, thrust coefficient and torque coefficient, it shows that the error between numerical simulation and MATLAB program is not more than 10%. The error is mainly due to the theoretical calculation model without taking into account the rotation of the blade and the approximate treatment of the root of the blade and so on, but within the acceptable range in engineering. The above research shows that the two methods of the aerodynamic performance parameters calculation are feasible, and have theoretical value and practical value to the blade aerodynamic shape optimization.