Research On Microtab Airfoil Aerodynamic For Wind Turbine Blade

With the energy crisis and environment problem increasingly prominent，thewind power, as a representative of renewable energy, have received more and moreattention of the countries all over the world. After years of rapid development, thewind turbines have come into the megawatt. Due to the influence of wind shearand turbulence, the vibration load of the turbine blades seriously affect the servicelife of the wind turbines. The research of smart blades that can decrease thevibration load of the turbine blades has important pratical significance to improvethe power production and the service life of the wind turbines.The paper have studied the aerodynamic characteristics of airfoilNACA64618that vertically installed a microtab on the upper surface of trailingedge. Analysed the effect of installed locations and heights of microtab on the liftand drag coefficient of airfoil NACA64618through CFD numerical calculation,and have determined the optimal installation position and height of microtab. Then,the effect of microtab on the vibration load of the turbine blades with kinds ofwind speed is presented, with a result that the microtab airfoil can effectivelyreduce the load of turbine blades, meanwhile, ensure the rated power production.A method is proposed to measure the local wind speed of turbine blade basedon the research of microtab airfoil aerodynamic. A pair of microtabs are installedon the upper and lower surface of leading edge of airfoil, and the local wind speedcan be obtained through the bending moment of two microtabs. The detailedprocedures to get the local wind speed of blade is discussed.A blade model has been made to carry out the wind tunnel test, and theexperiment results correlated well with the results of numerical calculation.