Wind Turbine Blade Load And Displacement And Stress/Strain Coupling Of Research

Wind energy as an important clean and renewable energy,by the world’s favor,wind power has become a major source of energy for many countries.With the increasingly mature wind power technology,wind turbine unit capacity is growing,resulting in wind turbine wheel diameter size increases,the main components of the wind turbine blade size and weight of the corresponding increase.The wind turbine blades are important energy conversion and force components in the wind turbine.The wind turbine blades are prone to large deformation and cause the concentration of the strain / stress of the blade structure which are subjected to a variety o f loads in the actual operation,thus affecting the safe operation of the wind turbine and the blade life.Therefore,the study of wind turbine blade load and its displacement and stress / strain co upling has great theoretical significance and great engineering application value.Gravity load,inertial load and aerodynamic load are the main loads to bear the running of wind turbine blade.The complexity of leaf load analysis is mainly due to the coupling characteristics of various loads.Based on the similarity theory,the whole size of the blade is reduced with reference to the aerodynamic shape design of a 1.5MW wind turbine blade.The three-dimensional modeling software is used to study the solid model of the blade.The model is introduced into the finite element software ANSYS Fluid-solid coupling calculation.Using the static structure analysis module,the different loads is applied to the static calculation of wind turbine blade model,the distribution of stress and strain of the blade structure under deformation and displacement of a blade under a single load condition is analyzed.By analyzing the displacement and stress / strain characteristics under single load conditions,it is concluded that the aerodynamic load is the main factor of the large deformation and stress strain of the blade of the wind turbine,and it has a positive correlation with the wind speed and the wind speed.The deformation of the blade is mainly waving deformation.Considering the coupling relationship of the three loads,the displacement and stress / strain changes in each position along the blade direction are quantitatively analyzed.In order to verify the reliability of the simulation results,this paper uses the non-contact three-dimensional displacement measurement system to measure the displacement of the blades at different positions under the combined action of gravity and inertial load.The results of the test are compared with the simulation results under the same working conditions.The results of the test are larger than those of the simulation results,but the deformation trend of the two leaves is consistent,which shows that the simulation results can be used to analyze the wind turbine blade structure.The study of load and deformation and stress / strain coupling is feasible and reliable.In this paper,the displacement and force response of wind turbine blades in a variety of load coupling are fully characterized and analyzed,which will provide a reliable basis for the design,operation and maintenance of wind turbine blade structure.