Numerical Simulation And Rehabilitation Of Aerodynamic Profile Of Wind Turbine Blades

With the rapid development of wind power industry all over the world,the maintenance cost of blades increases year by year.Because the repair principle involves the technical secret question,the overseas well-known blade production company has not announced its repair principle publicly.It causes two times or more times to repair the blade,even the scrap.The principle of structural rehabilitation has been formulated by domestic production company,which based on the autonomic design method of blades.But there are many defects in the principle.Blades sold abroad often have two repairs.In this paper,the aerodynamic performance of 45.3 type blade damage and repair state is studied,with based on the measured data analysis.Then,the basic principle of aerodynamic rehabilitation is derived.The main work carried out includes:Firstly,numerical simulation of 45.3 type blade is carried out,by studying the basic theory of blade design and using fluid mechanics common calculation software FLUENT.According to the measured data analysis,the numerical model of 45.3 type blade damage and repair state is determined.Two typical sections with a significant effect on power generation efficiency are selected.Secondly,the two-dimensional flow field analysis is used to obtain the different state of a typical airfoil section with the stress nephogram and velocity contours.Applicable areas and basic requirements for deriving principles of aerodynamic rehabilitation are derived.Moreover,examples of 45.3 blade are used to verify whether the basic principle can effectively improve the power generation efficiency of repair blades.The validity and feasibility of the principle of aerodynamic rehabilitation are verified.Finally,by simulating the damage and repairing state on the 56.5 type blade,the versatility of the principle of aerodynamic rehabilitation is verified.