The Analysis Of Wind Turbine Airfoil Aerodynamic Performance And Fluid-solid Interaction

In the working process of wind generators, wind turbine, as an important part of energy conversion, interact with the air flow every minute. The aerodynamic performance of wind turbine blade directly determines the level of its wind energy conversion efficiency. For the blade, the changing flow field characteristics inevitably drive to change the aerodynamic loads on the blade in turn. The newly applied aerodynamic loads repeatedly make the blade deformation, and so forth. The interaction between the structure and the flow field pose a major threat to the safety of the wind turbine. For the flow field, the blade deformation result from the interaction can alter the flow characteristics of flow field, which is particularly important for the efficiency of generators’ operation in wind farm. Thus, it is of crucial importance to study the aerodynamic performance of blade, structural vibration characteristics and the characteristics of flow field.Based on ANSYS Workbench physical simulation platform, the airfoil aerodynamic performance, vibration characteristic and the flow field characteristics of a 10 k W wind turbine blade were studied with CFX two-way fluid-structure interaction method. The main contents are as following:1. Provided by CFX platform, the aerodynamic performance of SG6040 wind turbine airfoil has been addressed, so as to the influence of different turbulent model for flow around airfoil and Reynolds number on the airfoil drag coefficient and lift coefficient.2. Based on the Workbench platform, the flexible blade structure and both the single and two-way fluid-structure interaction analysis were completed. This paper will also study the influence of prestress forces on blade modal and the corresponding vibration mode, and then separately discuss how the prestress forces due to rotation and fluid-structure definitely work toward its vibration frequency.3. With two-way fluid-structure interaction method, characteristics of flow field will be analyzed,and then followed by the study of wake flow field characteristics in the expectation of guiding the optimization of large wind turbines layout in the wind farm.