Abstract
Simulations of a stiff rotor configuration of the DTU 10MW Reference Wind Turbine are performed in order to assess the impact of prescribed flap motion on the aerodynamic loads on a blade sectional and rotor integral level. Results of the engineering models used by DTU (HAWC2), TUDelft (Bladed) and NTUA (hGAST) are compared to the CFD predictions of USTUTT-IAG (FLOWer). Results show fairly good comparison in terms of axial loading, while alignment of tangential and drag-related forces across the numerical codes needs to be improved, together with unsteady corrections associated with rotor wake dynamics. The use of a new wake model in HAWC2 shows considerable accuracy improvements.
Highlights
The size of wind turbines has been increasing rapidly over the past years
It is seen that the predictions of the thrust force variation in time due to the flap action are comparing well, but power is overpredicted by Computational Fluid Dynamics (CFD) compared to the engineering models due to a higher prediction of tangential force variation resulting from the drag forces
In terms of radial distribution, both the axial and tangential force comparisons show an overprediction of the variation by the engineering models, as compared to the smooth distribution around the flap region predicted by CFD and the near wake model with HAWC2
Summary
The size of wind turbines has been increasing rapidly over the past years. Rotors of more than 160m in diameter are already commercially available. Results of the engineering models used by DTU (HAWC2), TUDelft (Bladed) and NTUA (hGAST) are compared to the CFD predictions of USTUTT-IAG (FLOWer). Results show fairly good comparison in terms of axial loading, while alignment of tangential and drag-related forces across the numerical codes needs to be improved, together with unsteady corrections associated with rotor wake dynamics.
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