The Contour Design And Numerical Simulation Analysis Of Great Wind Turbine Blade

Nowadays, with the drying up of conventional energy and the increasing pressure of environment protection, wind energy, which has been regarded as a clean renewable energy, is becoming more and more popular around the world. Wind turbine is the most important form in the utilization of wind energy. The blades of a wind turbine rotor are generally regarded as the most critical components of a wind turbine system. The aerodynamic performance of wind turbine blade directly influences the wind energy utilization coefficient.The aerodynamic contour design of a 2MW Variable Speed Constant Frequency(VSCF) wind turbine blade has been researched in this thesis, and the design of the blade has been showed to be basically reasonable with the use of numerical simulation analysis. The main content of the thesis consists of the following parts:Firstly, four basic theories about wind turbine blade design are researched, and the calculation model has been founded based on Strip Theory. The coordinate system of a wind turbine, which considers into many kinds of influence factors, is established in this part, and the design model can become closer to the actual conditions. With the use of genetic algorithm for optimization, the largest energy output is the most important target.Secondly, the calculation results of the chord length and torsional angle are revised in this thesis, so as to make it more convenient to install and manufacture. Combining with the theory of coordinate transformation, the data of the aerofoil section of blade are converted to the 3D data by the software of EXCEL, and the 3D solid model is built through Solidworks.Then, the pneumatic performances for two-dimensional NACA63212 aerofoil are simulated and analyzed with the help of CFD software—Fluent. The Spalart-Allmaras turbulence model is employed in the simulation. We can find the distribution features of velocity and static pressure around the aerofoil. Also can we get the relationship between these parameters and the angle of attack. The results can supply technological parameters and advices for the design and research of wind turbine blade.Finally, the aerodynamic simulation for the 3D wind turbine blade has been analyzed in this part. The meshes of the interior and exterior flow field are generated by the professional software Gambit, and the boundary conditions are fixed on. The Fluent software is used for numerical simulation of the aerodynamic performance for wind turbine at rated wind speed and several other speeds. Turbulence model is SST k-ω. The actual output power and wind energy utilization coefficient can be calculated according to the torque of the blade. The results are helpful to furtherly understand the aerodynamic performance of wind turbine blade, and they can verify the feasibility and reliability to numerical simulation analysis.