Finite Element Modeling And Lightweight Design Of 1.5MW Wind Turbine Blade

Enlarging the length of the blade,not only can improve the efficiency of the fan,but also can reduce the cost per unit power generation. Development of wind power generation technology is imperative for today’s energy industry. With the development and improvement of fan technology,unit installed capacity is also growing,which requires the area of wind wheel expanding,the area is directly proportional to the radius’ square,blade length becomes double,the area can be three times more than the original fan. But the increasement of blade length puts forward higher requirements to the design of blade.This paper discusses the main classification and basic working principle of wind turbines, on the basis of knowledge about wind turbine blade and rotor essential parameter, make further analysis of these parameters’ effect on the fan operation efficiency.Discusse the basic mathematical theory model for blade design, include Batz theory, Glauert eddy theory. Although these basic theories are derived from the compact wind turbines, but they still have guiding significance for modern large fan design.Analyze the load sources during the fan operating process and theoretical calculation, based on the mathematic basic theory, calculate the blade’s basic geometric parameters under the design conditions (1.5 MW, the NACA-4412), obtain the airfoil surface coordinates by Profili blades design software, combining the theory of the fan,acquire the actual chord and torsional angle, convert them into the size for design, further, by coordinate transformation model, transfer the two-dimensional data points to three dimensional space.Use Solidworks powerful surface modelling function in three-dimensional space, carry out three-dimensional model. was on the design of vane, through simulation analyses the blade stress and strain, and the vibration modal analysis.Take advantage of Matlab to optimize the blade chord’s length and torsional angle, acquire the optimization formula, design the optimized blade’s layer, compared with the original blade analysis. the optimizated model is economic and reasonable, on the promise of guarantee the blade basic performance, achieve the lightweight design of large blade.