The Optimal Design And Numerical Simulation Of Small Horizontal Axis Wind Turbine

This article focuses on 2KW small fixed pitch horizontal axis wind turbine using the CFD software to explore the aerodynamic performance of wind turbine special airfoils and wind wheel regarding to numerical method. The energy lost and space structure of wind turbine is influenced by the performance of the airfoils.The following areas are being covered and an efforts are made to investigate in this study.Three different kinds of airfoils with the similar relative thickness of 21% were choosen,the name of the blades are NACA0021,NACA63421 and NREL-s809. 2D caculated models of airfoils are being built and compared with each other. With the help of Fluent software,the aerodynamic performance of the airfoils is simulated and analyzed when the Renald Number is 5.5×105,comparison between the simulated data and the experiment data is carried out in order to verify the reliability of aerodynamic numerical simulation. The simulation and analysis is helpful to understand the aerodynamic performance and character of aerofoils of wind turbine.Numerious factores need to be considered when the 2KW small fixed pitch wind turbine are being built, for instance the tip of blade loss,the root of blade loss,the axial and circumferential factor is also vital to the construction of 2KW small fixed pitch wind turbine and has the effects on the performance of the blade in order to optimize the function. Thanks to the Pro/ENGINEER 3D modeling software and the widely application and implenmentation, the target of building three dimensional solid model of the wind turbine blades and rotor are realized.At last, if different conditions applied ,the statistics generated in numerical method will vary in wind turbinr power and efficiency. Therefore we have to use software Fluent in numerical simulation for wind turbine at rated operating condition and five other conditions to get the the different numbers respectively. In conclusion, it can be verified that the optimal design method and numerical simulation are reliable and valid. Meanwhile the analysis of pressure and velocity distribution of the wind wheel blades at rated operating conditions were given and the likely effects of the three dimensional rotationalon the flow characteristics.