Effect Of New Type Vortex Generator On The Aerodynamic Performance Of Wind Turbine Blade Airfoil

Wind energy is a kind of pollution-free and renewable energy.With the proposal of dual carbon policy,wind power has been developed at high speed.In researching wind power generation technology,improving wind turbine blade airfoil aerodynamic performance and improving power generation efficiency is a significant research direction.In improving the aerodynamic performance of blade airfoils,it is a standard measure to install vortex generators on blade airfoils.The research on the aerodynamic performance of the airfoil of vortex generators with different parameters is of great significance to improve the power generation efficiency of wind turbines.However,the optimization effect of the existing vortex generator on the aerodynamic performance of the airfoil is not ideal,and the design needs to be further optimized.In this thesis,with the wind tunnel test method,the influence of the parameters of the traditional right triangle vortex generator on the airfoil aerodynamic performance was studied systematically,which obtained the research law of the vortex generator parameters’ effect on the airfoil aerodynamic performance.On this basis,the vortex generator’s shape was optimized,and a new type of vortex generator with a better lift and drag reduction effect was obtained,which provided a theoretical basis and technical support for improving the power generation efficiency of the wind turbine.The specific work is as follows:(1)A two-dimensional rigid pressure measurement model of NACA4418 airfoil was designed and made,and the traditional vortex generator model with different parameters was installed on the two-dimensional airfoil.The wind pressure-time history of the surface measuring point of the conventional vortex generator airfoil with extra height and installation position at high Reynolds was studied systematically.We can find that the lift coefficient of the airfoil increases by 22.88%,and the drag coefficient decreases by 33.13% when the triangle vortex generators with 5mm height install at 0.2C on the suction surface of the airfoil.At the same time,the vortex generator can play a better lift and drag reduction effect on the local rough airfoil.(2)Based on the analysis of the parameters of the traditional vortex generator,three types of vortex generators with obtuse angle,acute angle,and streamlined were optimized,and the distribution law of the airfoil aerodynamic coefficient with the new type of vortex generator was studied.Compared with the traditional right vortex generator,the shape of the vortex generator with the best effect on improving the airfoil aerodynamic performance is streamlined.Compared with the traditional vortex generator,the streamlined vortex generator increases the lift coefficient of the airfoil by 13.1% and the lift-drag ratio by 11.6%.(3)The flow field mechanism of the new type vortex generator influence on the airfoil aerodynamic performance was studied.Installing a new type of vortex generator airfoil with a reasonable shape can further increase the airfoil’s lift coefficient and delay the airfoil’s stall attack angle.The variation of aerodynamic lift coefficient and wind pressure coefficient with Reynolds numbers of a new shape vortex generator airfoil was tested.The Reynolds numbers effect on the airfoil aerodynamic performance with new type vortex generator was clarified.