Research on the Aerodynamic Performance of Pre-bent and Pre-twisted Blades of Large Wind Turbines
In order to solve the problem that the blades of large wind turbine are easy to deform under the condition of high-power aerodynamic load,which leads to the decrease of wind turbine operation efficiency,a pre-bent and pre-twisted blades design idea is proposed.In this paper,three-dimensional flow field simulation and one-way fluid-solid coupling of NREL 5 MW wind turbine blades are carried out to study the aerodynamic performance and deformation of the blades under different working conditions.Based on the deformation of the blades under rated working conditions,the pre-bending and pre-torsion is carried out.The optimal pre-deformation parameters of the blades are obtained through continuous iteration,so that the geometric shape of the final blades after elastic deformation under the aerodynamic load of the rated working conditions is consistent with the original design.The results show that the pre-bent and pre-twisted 5 MW wind turbine blades can effectively eliminate the problem of wind turbine efficiency reduction caused by blades bending and torsion caused by aerodynamic load,and the wind energy utilization rate is increased by 2％.
wind turbine bladesflow field simulationaerodynamic performanceone-way fluid-solid couplingpre-bending and pre-torsion
NETL
NSTL
万方数据
