Aeroelastic Stability Analysis Of Wind Turbine Blade Based On Fluid-Structure Interaction

With the growing prosperity of wind power in the energy field, the research of windturbine has also received more and more attention. In the process of the wind turbineoperation, as the critical part, the blade is interacting with the flow field at any time. In theflow field, the deformation of blade makes the flow field change its shape; as to the blade, thechange of flow field’s shape yields new aerodynamic loads. This interaction between theblade and the flow field is called aeroelastic phenomena. In the process of this interaction, theblade may lose its stability. Once the blade loses its stability, in a short time, the failure ofblade will happen in the form of cracks, fracture. etc.. And the wind turbine will bedemolished permanently. Therefore, for the operation of the wind turbine, the aeroelasticstability of blade has great significance.Based on ANSYS Workbench, which is a multi-physics simulation platform, applyingthe two-way fluid-structure interaction method, the aeroelastic stability of wind turbine bladeshas been studied. The major works of this paper are as follows:1) The basic principles of computational structural dynamics(CSD) and computationalfluid dynamics(CFD) in the fluid-structure interaction was elaborated, and the process offluid-structure interaction calculation was analyzed. Based on these, the application of thefluid-structure interaction to ANSYS Workbench was studied.2) Based on the basic parameters of blade, applying Glauert method, the spatialcoordinates of blade were calculated by MATLAB software. And the spatial model of thewind turbine blade is established using the three-dimensional modeling software UG,.3) On the basis of blade’s spatial model, in the rotating state, the pre-stressed modalanalysis of blade was researched, and compared with the stationary blade modal state, itproved that the state of motion of the blades has a greater impact on its modal frequencies.4) Employing the method of fluid-structure interaction, at the rated operating conditions,the aeroelasticity of wind turbine blade was analyzed, and the stability of blade was assessedusing the energy method.5) In order to illustrate the correctness of aeroelastic stability analysis in this essay,taking Rotor67as example, the steady flow field analysis and the fluid-structure interactionanalysis were carried out, and the results were compared. The results indicated that thedeveloped method of fluid-structure interaction is feasible to conclude the aeroelastic stability.The fluid-structure interaction methods and the results of the blade numerical analysishave a certain reference value for the aeroelastic stability study.