Research On Coupled Fluid-solid Theorem And Dynamic Damage Mechanism Of Wind Turbine Based On Data Exchange Methods

Due to the global warming and environmental pollution caused by the development of mineral resources,governments have paid more and more attention to the development of new energy.As the world's largest wind power country,China attaches great importance to the development of wind power.With the advancement of technology,people began to use larger fan structure sizes and built wind turbines in more harsh environments,which has led to an increase in fan accidents year after year.For the structure of the wind turbine,the wind and earthquake loads are the most influential.To study the influence of wind load on the structure,the coupling between fluid and solid must be considered.At present,the research on the fluid-solid coupling of wind turbines at home and abroad is mainly reflected in the coupling of the blades with the airflow or the coupling of the tower and the airflow,and the blade-tower-base structure is coupled as a whole for fluid-solid coupling.Less research.Based on this,this paper intends to use the multi-physics coupled CFD/CSD(Computational Fluid Dynamics/Computational Structural Dynamics)bidirectional fluid-solid coupling method to consider the wind turbine "blade-tower-base-foundation" as the overall coupling.The system structure closely links the aerodynamic effect of the blade with the structural bearing capacity of the tower and the foundation,and studies the law of structural damage development and change,so as to more accurately study the fluid-solid coupling mechanism of the wind turbine coupling system structure and Damage damage mode provides support.The research content is mainly divided into three parts,including the analysis of bidirectional fluid-solid coupling characteristics of wind turbines,the nonlinear damage mechanism of wind turbine coupling system,and the structural response characteristics of wind turbines under combined fluid-solid coupling-seismic interaction.The research results mainly include the following and several parts:(1)The basic equations of fluid-solid coupling,turbulence model,dynamic mesh technique and data transfer method are described.The theoretical support of the fluid-solid coupling method in data exchange software MpCCI is expounded.The calculation of the classical method of cylinder flow is verified.(2)The wind turbine generator blade-tower-base structure coupling system model and fluid domain calculation model are established.The modal analysis principle is used to analyze the structure's natural vibration characteristics.(3)By setting different boundary conditions in the fluid domain,Fluent and Abaqus were connected by MpCCI to study the fluid-solid coupling characteristics of wind turbines at different wind speeds.(4)Introducing the plastic damage constitutive,studying the nonlinear characteristics of wind turbine foundation under fluid-solid coupling,exploring the influence of damage development law and structural failure mode on the safe and stable operation of wind turbines,the optimization of foundation structure and reinforcement design,it is important.Theory and engineering draw lessons.(5)The absorption effect of wave energy by different boundary conditions is verified by an example.The viscoelastic boundary and IEM boundary are applied to the ground motion response analysis of the actual model.The absorption effect of the IEM boundary and the viscoelastic boundary on the wave energy in the fan structure is carried out.(6)The structural response characteristics of wind turbines under the combined action of fluid-structure coupled shear wind and ground motion are studied,and suggestions for the design of wind turbine structure are provided.