Abstract
The composite rotor blades have been widely used as an important part of the wind power generation systems. Because there are several advantages in composite materials, the strength, stiffness, damping and durability of which are all excellent, more and more peoples put their emphasis on the use of the composite structures. In addition, it is possible to tailor aeroelastic performance of composite rotor blades by controlling laminate angles or sequence. In this paper, the static aeroelastic stability of wind turbine blade, which can generate 10kW power, has been investigated by means of the combination of CFD and CSD based finite element methods. Three candidates for fiber-reinforced composites rotors with different stacking sequences were studied. First the static deformation and vibration analyses considering the centrifugal force due to high speed rotation were carried out so as to predict the out-of-plane and in-plane displacements at the tip and maximum stresses in the root of a wind turbine as well as to check the changes of the dynamic modal properties according to rotating speeds. And then, the coupled fluid-structure interaction analyses were performed by taking into account rotary aerodynamic forces on the composite rotor blades. The ALE (Arbitrary Lagrangian Eulerian) coordinate was used to compute static nonlinear aeroelastic deformation of the wind turbine blades by using ADINA program. Even though the displacements and stresses increased apparently with increasing aerodynamic force, the transverse displacement and stresses of the designed composite rotor blade were still in the range of safety under the condition of maximum rotation speed of 140RPM.