Fluid-structure Interaction Analysis Of Small H Type VATW Blade Airfoil And Static-dynamic Research On Tower

As one of the key renewable energy, wind power is now widely used in the world. Modern wind turbines are mainly divided into two categories:horizontal axis wind turbines and vertical axis wind turbines. With the characteristics of excellent low velocity performance, low nosie, high safety, simple structure, low cost, the small H-vertical axis wind turbine provides good prospect. The blades and tower are the main components of the wind turbine, which the aerodynamic performance of blade airfoil are related with the utilization ratio of the wind turbine. As the wind turbine supporting part, tower’s safety has important influence on the wind turbine. Aiming at the NACA aircraft airfoil usually used for the vertical axis wind turbine, a analysis of fluid-structure interaction is carried, basing on the finite element theory, statics and dynamics analysis are carried on the cylindrical tower of the vertical axis wind turbine.Analyzing the force in working station as well as the airfoil life coefficient and drag coefficient, which providing foundation for the airfoil simulation. According to the coordinates data of the NACA0015airfoil, a geometric model is established in the ADINA pre-processing, then the structure-fluid coupling calculation is carried on by ADINA-FSI. The accuracy and convergence of the selected Spalart-Allmaras is guaranted by the calculation and analysis. The grid influence on the calculation results is analyzed by comparing the difference of four grids results, and the appropriate grid for the thesis is determined. Calculating the aerodynamic characteristics of the airfoil with the growing of the angle of attack, establishing the relationship between them. Working out the difference by the comparision of strcuture-fluid coupling simulation and pure fluid simulation at different reynolds. Further research will be benefited by this thesis.Analyzing the methold of force on wind wheel and tower of VAWT in conditions of extreme weather, then work out the force based on the extreme weather of Shandong province. Calculating the compressive stress of the tower and analyzing it’s strenghten, finite element methold has higher accuracy and reliablity. According to the different dimensions of the cylindrical tower, analyzing the superiority of the change in cylindrical wall thickness and diameter in reducing the tower stress, that the changing the diameter of the cylinder is more economical. Considering the overall structure of VAWT and the influence of foundation, getting four modes of the cylindrical tower below20Hz by modal analysis, considering the wind wheel rotational frequency, the frequencies are analyzed, according to the International Standard Specification for cylindrical tower discuss the safety of the tower, study on the relationship between the modes of cylindrical tower and the factors of the wall thickness and radius, it will provide help for tower design.