Numerical Simulation Investigation Of The Effect Of Vortex Generator Parameters On Aerodynamic Characteristics Of Wind Turbine Blade

In recent years, wind turbines have been paid more and more attention around the world and developed quickly, however, because of the existence of stall characteristics at high angle of attack range for blade, the power generation of wind turbine blade is not particularly desirable. Blades are the most crucial and most basic components of wind turbine generators, aerodynamic performance of the blade is essential, which is the fundamental factors to determine wind turbine power generation. When the blades reach the stalling angle of attack, the phenomenon of boundary layer flow separation emerges significantly easily at the blade surface, which will cause aerodynamic performance of the blade rapidly reduce. Flow separation can be effectively suppressed by installing the vortex generator(VG) on blade surface, which can improve obviously the wind turbine power generation. Thus, vortex generators design on wind turbine blade is especially important at high angle of attack range conditions.Supported by a grant from the National High Technology Research and Development program of China(863 Program, No.2012AA051301) and National Natural Science Foundation of China(No.51175526), “Numerical Simulation Investigation of The Effect of Vortex Generator Parameters on Aerodynamic Characteristics of Wind Turbine Bladeis” is proposed. The aerodynamic performance of DU91-W2-250 airfoil with VG and a clean airfoil section is calculated, the experimental aerodynamic performance of DU25 VGA and above are compared and analyzed. Based on DU91-W2-250 airfoil, the effect of position and shape parameters of VG on the aerodynamic characteristics of airfoil section is researched by CFD. Compared the aerodynamic performance among airfoil section with VG, clean airfoil, and DU25 VGA, the analysis of position and shape parameters of VG on flow separation and aerodynamic performance of the airfoil is focused on. According to the above numerical simulation study, the design method of VG airfoil section is summed up. The main contents and ideas are as follows:(1) With ANSYS ICEM-CFD meshing the flow field and airfoil section, the aerodynamic performance of airfoil section with VG is calculated by ANSYS FLUENT. Compared with the experimental results, the meshing method of airfoil section with VG and calculation method of aerodynamic performance are proposed.(2) Based on DU91-W2-250 airfoil, the aerodynamic characteristics of airfoil section with VG is calculated by ANSYS FLUENT. Compared the aerodynamic performance among DU91-W2-250 airfoil with VG, a clean airfoil section and DU25 VGA, the effects of the VG shape parameters on the airfoil surface flow separation and vortex characteristics of the typical VG shape is analyzed. With the same method, the effects of the VG shape parameters on the airfoil surface flow separation and vortex characteristics of the typical VG shape is analyzed. Results show that: when the leading edge wedge angle of VG is 25°, aerodynamic performance of airfoil section is the best; when the height of VG is 7mm, airfoil section has the best aerodynamic performance; when the upper edge length of VG is 7mm, VG achieves the best inhibitory effect on flow separation.(3) With the same method, Compared the aerodynamic performance among DU91-W2-250 airfoil with VG, a clean airfoil section and DU25 VGA, the effect of location parameter of VG on the aerodynamic characteristics of airfoil section and the vortex characteristics of the typical position is analyzed. Results show that: when the angle between VG and installation angle is 18°6(Re =3.0 ?10), airfoil section achieves the best aerodynamic performance; when the distance between the two VG is 9mm6(Re =3.0 ?10), aerodynamic performance of airfoil section is the best; when the VGs locate in the 20% position of the chordwise position6(Re =3.0 ?10), VG achieves the best inhibitory effect on flow separation.(4) Based on the above analysis results, a blade of radius 3M is designed. A comparative analysis on the performance of the blade added a pair of vortex generator at relative thickness of 25% position is carried out.