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3D stall delay effect modeling and aerodynamic analysis of swept-blade wind turbine
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For Horizontal Axis Wind Turbine (HAWT), the aerodynamic performance of the blade will become different when the geometry of the blade is bent backward in the rotor plane, which is usually called backward swept blade. In this paper the aerodynamic performance of backward swept-blade rotor will be analyzed by Free Wake Lifting Line Model and the corresponding wake vortexes are discussed. In order to make it possible to apply lifting line method, a proper 3D effect modification model is needed to be added in the computation. First, a new 3D stall delay model is established, named Inviscid Stall Delay Model (ISDM), which is derived from the simplified Navier-Stokes (N-S) equations. In the model, we treat the stall delay effects differently by the delay of the separation point on the airfoil, and aim to capture the further negative pressure reduction in the separation area. Second, a Free Wake Lifting Line Model is created and it is validated by the experimental results of the National Renewable Energy Laboratories (NREL) Phase VI and Model Experiments in the Controlled Condition (MEXICO) wind turbine blades. Third, based on the blade of the NREL Phase VI, a backward swept-blade is constructed, which has the same sweeping area as the straight blade. After that the aerodynamic performance of the swept-blade is explored by the lifting line code. The development of the wake vortexes and its influence on the swept-blade are analyzed. It can be concluded that the swept geometry leads to a periodic lag of the circumferential positions of the shedding vortexes, while its axial components are almost unchanged. The swept geometry is an important influence factor for the induced velocities distribution in the rotor plane. Besides, it should be noticed that the optimization of the swept-blade is important for its aerodynamic performance analysis which is needed to be discussed in the future.
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