| Among many clean energy sources,the reserve of wind energy is very abundant.Among the global renewable clean energy power generation,wind power generation is second only to hydropower.Although the power generation capacity of wind power generation technology ranks second in the power generation capacity of renewable energy,there is still a large gap between the total power generation capacity of wind power generation technology and hydropower generation due to various technical disadvantages.In recent years,with the prominence of environmental problems and the shortage of global energy,countries all over the world have joined the ranks of exploring clean energy,especially wind power technology.The main tasks of this paper are as follows: First,according to the Reynolds number requirements of typical 2 MW wind turbine blades,the airfoil generation and boundary condition generation are completed based on the airfoil integrated expression theory.The results show that the airfoil designed by this platform has higher lift coefficient and lift-drag ratio in design,off-design and main Angle of attack.The requirement of lift coefficient decline after stall is also considered,which has great influence on blade fatigue life and is also the hidden characteristic of commercial wind airfoil.In the wind power generation technology,the excellent blade of a wind turbine can greatly improve the utilization rate of wind energy.At the same time,the total power generation of the generator is often directly proportional to the volume of the generator blades.With the increasing demand for wind turbine power generation,the volume of wind turbine blades is becoming larger and larger.In the process of increasing blade volume,there are many problems of blade structure instability.Therefore,in the whole process of wind turbine manufacturing,it becomes particularly important to design a wind turbine blade that can not only meet people’s demand for total power generation,but also has stable structure and performance.Based on this,this paper selects 2MW wind turbine as the object to audit and analyze its blades with the goal of improving its overall performance and structural stability.The main work is as follows:Firstly,taking the Reynolds number of the commonly used 2MW wind turbine blade as the design requirement,the airfoil structure and boundary conditions are generated based on the airfoil integrated expression theory.Under the corresponding boundary conditions,the aerodynamic performance of the selected airfoil profile is analyzed in this paper.The simulation results show that the airfoil profile selected in this paper has high lift drag ratio and is an ideal profile.At the same time,through the analysis results of the aerodynamic performance of the airfoil,it can be seen that the airfoil designed in this paper has high lift coefficient and lift drag ratio in the design,off design conditions and the range of main attack angle,and the overall performance is good.It provides some data basis for the later blade structure design.Secondly,the blade air structure parameters are designed.Because the design of large-scale wind turbine blades with good aerodynamic performance and high structural strength requires that the blade airfoil has the characteristics of high lift coefficient,large lift drag ratio and stable lift coefficient after stall.Based on the aerodynamic theory of wind turbine,starting from the basic theory of blade design and the basic concept of blade design,combined with the calculation formula of blade aerodynamic parameters,this paper completes the design and calculation of the structural shape parameters of wind turbine blades.A three-dimensional solid model is established according to the airfoil coordinate data and shape parameters.As the basis of structural analysis and optimization model in subsequent chapters.Finally,the finite element model of wind turbine blade is established in ANSYS Workbench platform,and the displacement,strain and strength ratio of each structural layer of the blade under extreme working conditions are calculated.The strength and stiffness of the blade are checked according to the relevant standards to check whether the designed blade meets the strength design requirements.Then,according to the finite element analysis results,the local structure of the designed blade is improved.Under the same wind load,the maximum stress of the improved structure is significantly lower than that before the improvement. |
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