Investigation On Aerodynamics Of Dedicated Wind Turbine Airfoils

With the development of science and technology,energy demand is ever-increasing. At the same time, Environment protection is an important problem that we must faced to.Wind energy as a clean green renewable energy is recognized by the society for its unique advantages.Adopting wind turbine to generate electricity is the major form of using wind energy to deal with above problem.The blades of Wind turbine is an important component of the wind turbine to absorb wind energy,the airfoil is the key assembly of the blades. So the design method research of wind turbine airfoils is a hot and the basic investigation the wind turbines in the study of aerodynamics nowadays.In this paper,on the basis of analysis the development status of domestic and foreign wind power and dedicated airfoils for wind turbines firstly,the basic theory of aerodynamics of wind turbine airfoils were described in detail,including the geometric characteristics of airfoils, the traditional and dedicated wind turbine airfoil series, and various series of airfoil aerodynamic characteristics are described. Secondly,with the aim of improve the accuracy of numerical calculation involved in turbulence models,mesh methods,discrete format,comparative study was conducted to find a more reasonable way, using this formula on different spanwise length of the straight blade has been calculated to study the three-dimensional effect on airfoil performance.Thirdly, during the numerical calculation,it was found that in the attached state flow airfoil life and drag curve fluctuation monitoring,but also fluctuated with the increase of the angle of attack, analysis of the reasons causing the phenomenon,and one by one to verify the calculationfound that excessive trailing edge thickness is the main reason causing the phenomenon, so did the original airfoil trailing edge, three modified calculation, the results show that the reduced trailing edge thickness would indeed reduce the drag and lift curve of the fluctuation monitoringand increased edge thickness will increase volatility.Finally,Gurney flap used to analyze the phenomenon of fluctuations for lift and drag of airfoil.