The Research Of Wind Wheel Blade Optimization Method Based On Wilson Model

The key of a normal, stable and efficient operating wind turbine is the quality of design, the level of wind wheel blade and the performance reliability. Blade design includes two parts, aerodynamic design and structural design. Aerodynamic design directly influences the utilization of wind energy, and then affects the generation efficiency of the wind turbine. Therefore, the analysis of wind turbine blade aerodynamic performance and the aerodynamic optimization have important practical significance.This paper summarizes the current situation of the development of wind power generator, vertical axis wind turbine’s characteristics and advantages, the future development trend of small wind generator, wind turbine generator’s working principle, structure and types, summarizes various of optimization methods including wind blade optimization, overlap ratio optimization, combinatorial optimization, auxiliary mechanism optimization etc.. A new optimization method of correcting wind turbine rotor blade chord length and twist angle based on Wilson model is proposed and the research content of this paper and the overall train of thought is combined. This paper firstly uses a distribution model of Weibull considering the influence by the wind shear, establishing wind speed probability density distribution model. The power, wind speed, wind energy utilization coefficient, electrical efficiency and other parameters are given based on blade element theory. The paper designs the structure of 1.5MW stall wind turbine system, obtaining the blade length, blade number, hub tip ratio etc. and choose 7 kinds ofN ACA series airfcil as each section airfoil. This paper followed uses the Profili software to analyze the aerodynamic performance for 7 NACA44XX series and NACA24XX series airfoils, obtaining the relationship between the change of attack angle and lift coefficient, drag coefficient, airfoil lift drag ratio, torque coefficient, obtaining the NACA44XX series and NACA24XX series of aerodynamic data and providing the basic data for aerodynamic performance analysis of wind wheel blade. The paper finally uses the tool of MATLAB based on Wilson mathematical model, with the chord length and twist angle as design variables, the hub to tip loss of F as a supplementary condition, considering the wind speed distribution, to optimum design and modification, getting the optimal distribution of blade chord length and twist angle and comparing the chord length and twist angle with the blade span. The results show that the wind turbine blade aerodynamic performance after optimizing can improve, which is further in line with the actual manufacturing situation.