Abstract
Passive load alleviation on wind turbine blades can be achieved through geometric bend-twist coupling, for example by sweeping the blade backwards. In order to obtain the correct load distribution of a curved blade with in-plane sweep and/or out-of-plane dihedral, the influence of the blade shape on the aerodynamics must be modelled correctly. This includes the influence of the curved bound vortex, and it is especially important when designing a wind turbine blade with aeroelastic tailoring. In this paper, the background for modelling the curved bound vortex influence will be described in detail and a modified method is proposed. The proposed method of bound vorticity modelling is compared for curved and straight translating wings as well as wind turbine blades with results from a panel code and a Navier-Stokes solver. From this comparison, the advantages of the current modification with respect to the other lifting-line implementations are shown. The method proposed in the present work is general and applicable to any lifting-line like model.
Highlights
In-plane backward swept wind turbine blades can achieve passive load alleviation with geometric bend-twist coupling
Passive load alleviation on wind turbine blades can be achieved through geometric bend-twist coupling, for example by sweeping the blade backwards
The results of the different lifting-line implementations considered in this study are depicted in Figure 2, and are compared with the prediction from the panel method
Summary
In-plane backward swept wind turbine blades can achieve passive load alleviation with geometric bend-twist coupling. The proposed method of bound vorticity modelling is compared for curved and straight translating wings as well as wind turbine blades with results from a panel code and a Navier-Stokes solver. The third option is to calculate the induction by curved bound vortex at 3/4 chord points and subtract the 2-D influence of the current section, as in LL-mod.
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