1 Department of Wind Energy, Technical University of Denmark 2 Aeroelastic Design, Department of Wind Energy, Technical University of Denmark 3 Risø National Laboratory for Sustainable Energy, Technical University of Denmark 4 Siemens Energy Inc.
Standard blade element momentum (BEM) codes use Prandtl¿s tip-loss correction which relies on simplified vortex theory under the assumption of optimal operating condition and no wake expansion. The various tip-loss functions found in the literature are listed. A simple comparison between them shows important differences in Annual Energy Production which reveal a large uncertainty in current BEM-based computations. A new tip-loss correction for implementation in BEM codes has been developed using a lifting-line code to account for the effect of wake expansion, roll-up and distortion under many operating conditions. A database of tip-loss corrections is established for further use in BEM codes. This model is closer to the physics of the flow and hence, a better assessment of the performance of wind turbines by this method is expected. © The Institution of Engineering and Technology 2013
I E T Renewable Power Generation, 2013, Vol 7, Issue 4, p. 311-320
Power, Energy and Industry Applications
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