Computation Of Aerodynamic Performance And Optimization Design Of A Large-scale Horizontal Axis Wind Turbine Rotor

Wind energy is a pollution-free renewable green energy resource. Presently, horizontal-axis wind turbine rotor power is the main form of wind energy exploitation. The wind power conversion efficiency is depended on the appearance of wind turbine blades. Aerodynamic performance calculation and searching optimization process is involved in the wind turbine blade designing . Although domestic and foreign scholars researched the main factors of aerodynamic performance, the horizontal-axis wind turbine rotor designing theory and method is not completed. This study focoused on the basis of the selection of horizontal axis wind-driven machine aerodynamics model , calculated the aerodynamic performance of rotor numerical solution of the optimization fancy aerodynamic appearance design, the optimization design of the aerodynamic performance and pitch regulation . The research content mainly includes three aspects:(1) The calculation on the horizontal-axis wind turbine aerodynamic performance . First, the involving of the complicated wake vortex aerodynamic model; Secondly, numerical method of Newton interpolation is applied to solve the integro-differential equations which includes circulation distributionon on the radial direction leaf,inducing the velocity and the wash Angle; finally, every pneumatic performance parameters is calculated on the basis of MATLAB .(2) The optimization design of the horizontal-axis wind turbine aerodynamic shape . First, Confirm the optimal performance index for the annual power wind turbines; Secondly, Dividing the blade into 17 section, and determining the design parameters selection that can change the design appearance based on the wind machine theory and the blades structure; then, determining the design variables constraint condition and the objective function; Finally, the appropriate convergence precision is selected according to the actual situation.(3) The horizontal-axis wind turbine blade optimization pitch regulation design and aerodynamic performance calculation. First, analysis pitch regulation trend in each wind blowing. Second, the design variables, the constraint conditions and the objective function is selected according to the pitch adjustment. Then, chooseing appropriate convergence precision and compile MATLAB program to design. Finally, the aedynamic performance under different wind speed is calculated on the basis of the updating vane angle, the former rated geometric parameters and the adynamic parameters to calculate .The following conclusion is obtained on the research and analysis: (1)The complicated wake vortex aerodynamic model, which is based on the limited blade numbers and the variable circulation along the blade axis, and the numerical method of Newton interpolation was applyed to solve the integro-differential equations, and the MATLAB program is adopted to calculate the horizontal-axis wind turbine power coefficient. Research shows that the selected aerodynamics model was matched with the actual operation rotor; Directly on the induction speed numerical integral differential equation could obtain more accurate pneumatic calculation results; the usage of the multi-threading array could improve the operation programming numerical calculation efficiency;(2)the PSO algorithm was used in the aerodynamic optimization designing . Research showed: considering the probability distribution of the specific wind field, the objective of maximizing the annual average power, using particle swarm algorithm to search the optimal global. From the optimal results we could found that the designing results of horizontal axis wind turbine rotor in the particular wind field is obviously better than the pre-existing blades on the same area, and the selected appropriate rated wind speeds was obtained.Thus the validity and practicability of the optimal model was proved.(3)The PSO was applied in the pitch regulation optimal design. The design was based on the proper designing variables and constraints, the objective function. Then the aerodynamic performance is calculated. The results showed that the optimization design from the pitch regulation value was linearly distributed, and the results was consistent to the regular theory; the tendency of all the aerodynamic performance variation was consistent with the pitch regulation aerodynamic performance curve in operation, and the effectiveness and practicability of the pitch regulation optimal model is shown.