Wind Turbine Blade Design And Stability Analysis

The blade is a central part of the wind turbine. If the unstable self excited vibration occurs to the blade, such flutter of the blade will influence the normal running of the wind turbine. In this paper, Schmitz theory is applied to design the blades of a 600kW horizontal-axis wind turbine, and aerodynamic performance of the wind turbine is analyzed by the theory of the blade element. Moreover the study of the dynamically response of the blade vibration behavior depending on mass, stiffness and aerodynamics is made.In the paper, the blade of wind turbine is simplified as the cantilever beam. The linear motion differential equation is established by modeling the two-dimensional airfoil of the section of the beam. In addition, aerodynamic stiffness and aerodynamic damping on the system are already obtained in the condition of fluid-structure interaction. It is known that aerodynamic loads are associated with blade vibration. The systematic eigenvalues are used to judge whether the flutter occurs so as to find the stable operating range of a wind turbine. Several calculations and discussions about the above example are carried out on the base of the experiment data in Niedriggeschwindigkeitsprofile. Secondly, agreement between the result from the mentioned eigenvalue arithmetic and the result from numerical calculation in the airfoil differential equation with Runge-Kutta method which obtain the trend of physical variable quantity demonstrate the fact that the assumed model and the given equations are valid.