Research On The Mathematical Relationship Between Pitch Angle And Wind Speed Of Blade Of Large Wind Turbine Based On Fluid-Structure Interaction

The wind is sustainable clean energy,so wind power has been more and more attentioned extensively.As the key components of wind turbine,wind turbine blade's aerodynamic performance and structural quality are decisive factors to guarantee the stable operation of wind turbines.Therefore,In this article,we regard the large flexible wind turbine blade in stall condition as our research object to analyze its adjustment of pitch angle and research the accurately mathematical relationship between pitch angle adjustment value of wind turbine blade and wind speed in the high wind speed conditions,which will provide a theoretical basis for engineering application.The main researches of this paper include the following parts:1.Regard maximum relative thickness as the constraint conditions,then reshape and optimize the airfoil:NACA63230,finally we get the airfoil:NACA63230-mod.By adopting the Wilson method,with maximum wind energy utilization coefficient as the goal,and with the relationship of induce factors as the constraints,we gained airfoil chord length and torsional angle of each section along the exhibition of 2MW wind turbine blade used Matlab software.Combining the airfoil data of NACA63230-mod,NACA63421 and NACA64215,we established the simulation model of wind turbine blades and rotor with Solid Works.2.By using Fluent software,we analyzed stall aerodynamic performance of the three kinds of blade airfoil in the wind turbine blades,then get the drag coefficients,lift coefficient and lift-drag ratio under different conditions.Compared the calculated results with Profili's results to verify the accuracy of the calculation of Fluent.Based on the theory formula of airfoil power coefficient,corresponded Matlab program to provide the deduced method of obtaining the mathematical relationship between pitch angle and wind speed.By using the method,we acquired 5 groups adjustment value of pitch angle under the wind speed that are greater than the designed wind speed.3.Completed the fluid-structure coupling analysis based on ANSYS Workbench platform.Selecting 5 groups of wind turbine blade's model,we acquired the value of output power respectively under the different wind speed and pitch angle,so as to verify the feasibility of the derived method of the mathematical relationship between pitch angle and wind speed.Discussed the blade's deformation and stress distribution of different model,and analyzed the strength performance of the blades,besidescompared the first six order modal shapes between withing wind stress and withing single constraint.In this article,beginning with the wing to design wind turbine blade,we established the 2MW wind turbine blade.Deduced the mathematical relationship between pitch angle and wind speed.Using fluid-structure coupling method to verify the accuracy of the mathematical relationship between pitch angle and wind speed,besides analyzed the strength performance and shimmy characters of the blades.The article's work provided a valuable reference for the related engineering application.