Numerical Study on Vertical Axis Wind Turbine with Bionic Tail Fin
In order to improve the aerodynamic efficiency of vertical axis wind turbine(VAWT),based on the principle of bionics,the bionic tail fin of fish was used as the bionic object,and the bionic tail fin structure was proposed to be arranged at the trailing edge of the airfoil,and its movement was made with the change of blade azimuth through active control.Using NACA0021 as the base airfoil,the effect of the bionic tail fin on the aerodynamic performance of the vertical axis wind turbine was studied by computa-tional fluid dynamics(CFD)numerical simulation,and the wind energy utilization coefficient,single blade torque coefficient,vortex cloud diagram and pressure coefficient of the vertical axis wind turbine with the original airfoil,fixed tail fin and active tail fin airfoil by applying the control strategies were com-pared and analyzed.The study result shows that the bionic tail fin can effectively suppress the flow sepa-ration under the active control strategy.The wind energy utilization coefficient can be improved by 18.3％and 26.7％compared with the original and fixed tail fin airfoils,respectively.The optimal oper-ating conditions can be shifted to the direction of low tip speed ratio,which improves the operational sta-bility of the vertical axis wind turbine.
NETL
NSTL
万方数据
