Rotor/ABL Aerodynamics (NNS)
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The major part of wind turbine rotor computations performed until now have been focussed on zero yaw rotor only configurations, with the nacelle and tower being neglected. Recently, simulations accounting for the shear of the mean velocity have been performed for low turbulent inflow and including more realistic turbine configurations. The generalization of these new computations to include both the rotor blade scales along with the large scales of the high turbulent atmospheric boundary layer is a challenging task, including fundamental study on laminar-turbulent transition, turbulence modelling of separated boundary layer flows and the effect of inflow turbulence.
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| Expected results: Comparison of state of the art turbulence models with multi-scale aerodynamic data. Development of phenomenological 'engineering' models describing dynamic stall and yaw. |
Milestones; Task 1 (NNS)
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Milestone
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Description
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Month
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Status
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M1
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Parametric study of RANS/DES computations of two modern turbines (NM80, Siemens 2.3MW) in atmospheric shear compared to experiment. (Using resolved rotor geometry and laminar/turbulent transition.)
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12
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Completed
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M2
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Evaluation of the importance of cross flow instabilities for modern wind turbine rotors.
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24
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Completed
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M3
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Parametric study of two modern turbines (NM80, Siemens 2.3 MW) turbine in yaw compared to experimental results. (Using resolved rotor geometry and laminar/turbulent transition).
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24
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Completed
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M4
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Development of refined 'engineering' yaw model
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36
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Completed
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M5
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Evaluation of dynamic stall models and airfoil characteristics with respect to dynamic inflow and inflow turbulence
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48
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Completed
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M6
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Simulation of various unsteady inflow conditions for the NM80. (Using resolved rotor geometry and laminar/turbulent transition)
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36
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Pending
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Project results and demonstrations.
1. Wind turbine modelled in a wind tunnel using CFD [Mexico experiment] by Pierre-Elouan Réthoré, DTU