Abstract
The influence of yaw misalignment on the aerodynamic performance of the New MEXICO rotor is investigated using blade-resolved Computational Fluid Dynamics (CFD) approaches with three wind speeds considered at a fixed yaw angle of 30 degrees. The air-load predictions and near wake characteristics from the numerical results are compared and discussed against the most recent wind tunnel test data. The nacelle impact, dynamic stall phenomenon and wake characteristics are analyzed, demonstrating the yaw effects and numerical issues raised from Reynolds-Averaged Navier Stokes (RANS) and Detached Eddy Simulation (DES) computations.
Highlights
A yaw situation occurs when a rotor is not perpendicular to the wind direction, which could happen to any wind turbine on every wind farm at any time
Results from both experimental and computational studies have shown that unsteady aerodynamics exist during all operating conditions and that dynamic stall can occur for high yaw angle operation while stall hysteresis occurs for even small yaw angles [1,2,3,4]
The experimental data presented in the following discussion come from the Model Experiment in Controlled Conditions (MEXICO) Experiment wind tunnel database from ECN [9,10] and the wind tunnel experiments described in the report of Boorsma and Schepers [11]
Summary
A yaw situation occurs when a rotor is not perpendicular to the wind direction, which could happen to any wind turbine on every wind farm at any time. The air-loads on each blade vary in time when the turbine is yawed due to large fluctuations in the relative velocity at the leading edge. Results from both experimental and computational studies have shown that unsteady aerodynamics exist during all operating conditions and that dynamic stall can occur for high yaw angle operation while stall hysteresis occurs for even small yaw angles [1,2,3,4]. Understanding the unsteady aerodynamic behaviour of the wind turbine in complicated yawed flow is essential to reliable and efficient designs
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