Research on Improving Aerodynamic Performance of Wind Turbine Blades Based on Owl Wing Characteristics
In order to improve wind energy utilization and develop blades with excellent aerodynamic performance,this paper takes the blades of the NREL 5MW wind turbine as the research object to improve the aerody-namic performance of large wind turbine blades by imitating the biological characteristics of owl wings.A combined airfoil was constructed based on the biological airfoil and the conventional airfoil and coupled with the non-smooth leading edge structure of the owl wing to design a bionic coupling blade with both characteristics.Based on the simi-larity theory,the scaled-down models of the prototype blade and the bionic-coupled blade are established.Numerical calculation methods were used to investigate the aerodynamic performance of the bionic coupled blade at different wind speeds.The results show that compared to the prototype blade,the wind energy utilization of the bionic coupled blade is improved by 6.76％ at a rated wind speed of 11.4 m/s,and the torque of the bionic coupled blade is im-proved by 9.89％ at the wind speed reaches 15 m/s.In the tip region,the flow velocity of the suction surface of the bionic coupling blade is enhanced,which increases the area of the negative pressure region of the suction surface and thus increases the pressure difference on the blade surface.At the same time,the bionic coupling blade can effectively suppress the spreading flow,reduce the trailing edge separation vortex,enhance the chordal flow,reduce the turbulent kinetic energy intensity,and reduce the energy loss.
BionicCombined airfoilNon-smooth leading edgeWind turbine bladeCFD
NETL
NSTL
万方数据
