The Characteristic Study On Fluid-Structure Interaction Of Wind Turbine

With the emergence of the world energy crisis,the development and utilization of new energy and renewable energy has become a hot research topic.As an important renewable energy source,wind energy has the characteristics of wide distribution,no pollution,huge quantity and renewable.It has become an important direction of new energy research.From fixed wind farms on land to floating wind farms on the sea,people’s utilization of wind energy has developed rapidly.The wind conditions of both the onshore wind farm and the offshore wind farm are complex and variable,which has a great influence on the aerodynamic performance of the wind turbine wind turbine.The changed aerodynamic load puts forward higher problems on the structural strength and elastic deformation of the wind turbine.The requirements also have a large impact on the output power,so it is crucial for the research work of wind turbines.The study of the fluid-structure coupling characteristics of wind turbines is very complicated.In this paper,the CFD calculation software is used to numerically simulate the aerodynamic performance of the wind turbine in a fixed state,then analyze the structure of the wind turbine.Finally,considering the bidirectional fluid-solid coupling of fluid solids,the aerodynamic performance and structure of the wind turbine are studiedFirstly,the aerodynamic performance of the wind turbine is studied.The NREL 5MW real-scale wind turbine model is used to simulate and simulate the ANSYS Fluent software.By modifying the different parameter settings and the selection of the turbulence model,the calculation accuracy is greatly improved.The torque and thrust are then compared with the literature results to verify the feasibility of the CFD methodSecondly,the modal analysis of the wind turbine was then carried out using Mechanical APDL software to study the variation of natural frequency and mode shape.Then consider the wind turbine under unidirectional coupling and introduce the aerodynamic load into the static structure for calculation.Study the equivalent stress and strain distribution of the pressure surface and the suction surface of the blade under different working conditions,and verify whether the strength is within the allowable range of the material.Deformation of the blade under different working conditions.Finally,in the workbench,Fluent and ANSYS Fluent are called through the Coupling System module to build a bidirectional fluid-solid coupling computing platform.The platform can realize real-time data sharing of fluid calculation and structural calculation,and numerical simulation of 5MW wind turbine considering bidirectional coupling.To study the thrust and torque of pure CFD calculation,analyze the influence of two-way coupling on the aerodynamic performance of wind turbine,analyze the wake of wake and CFD calculation under bidirectional coupling,and compare the two-way coupling and one-way coupling.For the influence of blade equivalent stress and deformation,the effects of one-way coupling and two-way coupling on wind turbine blade deformation are studied.