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Energies 2014, 7(10), 6798-6822; doi:10.3390/en7106798

Insight into Rotational Effects on a Wind Turbine Blade Using Navier–Stokes Computations

1
Forwind, University of Oldenburg, D-26111 Oldenburg, Germany
2
Fraunhofer Institute for Wind Energy and Energy System Technology, Ammerländer Heerstr. 136, D-26129 Oldenburg, Germany
*
Author to whom correspondence should be addressed.
Received: 31 July 2014 / Revised: 1 October 2014 / Accepted: 8 October 2014 / Published: 21 October 2014
(This article belongs to the Special Issue Wind Turbines 2014)
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Abstract

Rotational effects are known to influence severely the aerodynamic performance of the inboard region of rotor blades. The underlying physical mechanisms are however far from being well understood. The present work addresses this problem using Reynolds averaged Navier–Stokes computations and experimental results of the MEXICO (Model Experiments in Controlled Conditions) rotor. Four axisymmetric inflow cases with wind speeds ranging from pre-stall to post-stall conditions are computed and compared with pressure and particle image velocimetry (PIV) experimental data, obtaining, in general, consistent results. At low angles of attack, the aerodynamic behavior of all of the studied blade sections resembles the one from the corresponding 2D airfoils. However, at high angles of attack, rotational effects lead to stall delay and/or lift enhancement at inboard positions. Such effects are shown to occur only in the presence of significant radial flows. Interestingly, the way in which rotational effects influence the aerodynamics of the MEXICO blades differs qualitatively in certain aspects from the descriptions found in the literature about this topic. The presented results provide new insights that are useful for the development of advanced and physically-sound correction models. View Full-Text
Keywords: Reynolds Averaged Numerical Simulation; CFD; rotational augmentation; radial pumping; stall delay; rotational effects; wind turbine aerodynamics Reynolds Averaged Numerical Simulation; CFD; rotational augmentation; radial pumping; stall delay; rotational effects; wind turbine aerodynamics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Herráez, I.; Stoevesandt, B.; Peinke, J. Insight into Rotational Effects on a Wind Turbine Blade Using Navier–Stokes Computations. Energies 2014, 7, 6798-6822.

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