Research On Design Method Of 10MW Wind Turbine Blade

Based on the BEM theory,this paper aims to establish a new method for calculating the aerodynamic shape of the blade by constructing the mathematical model of the tip loss factor and root loss factor and the chord length.The research content of this paper is as follows:(1)A mathematical model of wind energy loss factor based on conformal mapping is established.The wind turbine wake vortex is a very complicated multi-dimensional flow.The multi-dimensional flow is simplified into a plane potential flow for further study.Through the conformal mapping theory and it’s solution,the mathematical model of the tip loss factor and the root loss factor is established.According to the BEM theory,the model can predict the thrust and torque of the wind turbine.(2)The finite element method based on Fluent for calculating the aerodynamic characteristics of 2D airfoil is researched.The feasibility of the method is verified by the wind tunnel experimental data.At the same time,by selecting the appropriate turbulence model and wall function,the 2D airfoil lift coefficient and drag coefficient can be accurately calculated.(3)In this paper,the univariate nonlinear equation for calculating the inflow angle is derived,and then the aerodynamic shape parameters and force parameters of the blade are calculated.Taking the 10 MW conceptual wind turbine blade as a design example,the calculation of the geometric parameters of the blade is completed by the method.The correctness of this method is verified by computational fluid dynamics methods from the airflow trace,turbulence kinetic energy,pressure and induced factor distribution.(4)Since the airfoil with a relative thickness of 60% is used near the root of the blade,the calculation results based on BEM theory show that the wind turbine has better performance at low speed.In the low wind speed region of 4 to 9 m/s,the power of the wind turbine is 13% higher than that of the DTU 10 MW.(5)The simulation results and analytical solutions are compared and analyzed.The influence of airfoil type on the aerodynamic characteristics of the blade is discussed.The compatibility of aerodynamic characteristics in the design of the blade is proposed.In addition,the airfoil near the root of the blade is analyzed,and the low-speed starting performance of the root of the blade is studied.