Research On Optimal Design Of Aerodynamic Shape Combination Of Wind Turbine Blade Airfoil And Vortex Generator

Vortex generator(VG)is a passive flow control device used on a wind turbine blade.It is widely studied because it can effectively suppress the flow separation of the boundary layer under a large angle of attack and delay the emergence of a stall angle of attack.In view of the problem that the current flat-type vortex generator generates excessive additional resistance at a low angle of attack,a new vortex generator with a CLARKY airfoil shape is proposed.The B-spline function is used to express the general airfoil profile.The airfoil design module,arbitrary airfoil adaptive mesh module,CFD flow field calculation module and genetic algorithm optimization module are integrated into the optimal program.An airfoil optimization design method based on CFD technology and genetic algorithm is proposed.This paper has carried out optimization design research on the aerodynamic shape combination of wind turbine blade airfoil and vortex generator.The selection of large thickness airfoil vortex generator provides a reference.First,the DU97-W-300 airfoil equipped with a flat-plate vortex generator was simulated with three turbulence models: SA,K ?-SST,and Transition-sst.Thenumerical simulation results were compared with experimental values to verify that Reliability of turbulence model and correctness of numerical simulation;numerical simulation and analysis of DU97-W-300 airfoil equipped with flat-type vortex generator and CLARKY airfoil vortex generator,respectively.The results show that the vortex generator with reverse symmetry CLARKY airfoil shape can further improve the maximum lift coefficient and the maximum lift-drag ratio of the airfoil compared with the flat vortex generator.Secondly,through the combination of CFD technology and genetic algorithm to optimize the design of DU97-W-300 airfoil and CLARKY airfoil.The maximum lift coefficient is 13.5% higher than the DU97-W-300 airfoil,and the maximum lift coefficient of the new WT-B airfoil optimized for the CLARKY airfoil is 12% higher than that of the CLARKY airfoil.Finally,the vortex generators with CLARKY airfoil and WT-B airfoil aerodynamic shapes were mounted on the DU97-W-300 airfoil and WT-A-300 airfoil respectively,and numerical simulation was carried out.The wing-shaped vortex generator is better for delaying the flow separation of the DU97-W-300 airfoil,and can further delay the stall angle of attack to 20 °;The maximum lift coefficient of the new airfoil WT-A-300 with CLARKY airfoil shape VG is about 11% higher than that of DU97-W-300 airfoil with CLARKY airfoil shape VG;The maximum lift coefficient of WT-A-300 with WT-B airfoil shape VG is about 8.5% higher than that of DU97-W-300 airfoil with WT-B airfoil shape VG.