Abstract:

The optimum design of the wind turbine blade is a very important factor for the efficient performance of wind turbines. In this study, the stress analysis of a wind turbine blade is done with finite element method. First, the geometry of a wind turbine blade which has a 13.02 m diameter and a power of 150-200 KW is determined and NACA-4418 profile is chosen as the blade profile. Next, according to maximum power principle, number of revolution of the rotor is found then, the torsional angle between root chord of blade and tip chord of blade is determined. After that, the structure whose geometry has been established is divided into finite elements being rectangular and triangular shell elements. In order to determine pressure distribution on the structure, it is modeled as a thin wing at mean line direction by dividing proper Vortex-Lattices with consistency of surface structure analysis. By using data obtained here, aerodynamic pressure coefficients are calculated on every element with the help of computer program. After the analysis of a data file is prepared. The stresses on the elements of the structure are calculated by using computer program with this prepared data file. After that, the structure is colored with different colors according to different stress values.

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