Three-Dimensional Modeling And Dynamic Analysis Of Wind Turbine Blade With Finite Element Method

As the environment problem becoming increasingly seriously, and energy supply more tense, countries all over the world have put more emphasis on exploitation of renewable energy, especially wind energy. This paper first discusses the advantages of the wind power generation and the development of wind power generation industry in China, then the following have been studied profoundly combined with the blade structure and working condition.Firstly, this paper introduced the basic working principles and structure of the blade, and some aerodynamics characteristics analysis of airfoil had been done according to some wind turbine theories. Then the paper gave the expressions of aerodynamic forces and analyzed some external factors, which can influence the parameters.Secondly, this paper designed a blade with airfoil NACA4412 under Matlab combined with many kinds of design models, then the curves fitting of parameters were carried out and eventually got the fitting functions of parameters in span-wise. Each result was compared; meanwhile the function of pitch and the chord has been derived, so that the range of its application will be more broader. This method can shorten the design process and improve efficiency.Additionally, with the help of 3-D modeling software and coordinate transformation, a three-dimensional model of blade was built up through Solidworks, based on the coordinates of blade sections. This laid a foundation for farther dynamic analysis.Finally, the paper studied the boundary layer separation flowing characteristics under the environment of Profili, the characteristic curves of airfoil was obtained and the paper stated the effects of thickness and camber of airfoil on lift and drag characteristic. Following that, static analysis and modal analysis were achieved by ANSYS software, and the paper also calculated the natural frequencies, each vibration modes, stress and strain diagram, in this case, these study can supply an analysis method for preventing blade resonance and increasing blade workinglife.