Abstract
AbstractSpectral analysis was performed on the time series data computed from pressure measurements on the New MEXICO (Model Rotor Experiments under Controlled Conditions) rotor in standstill conditions. As a priori, 3D airfoil polars were recreated from standstill measurements and compared against 2D airfoil polars and flat plate theory results to verify the measurements. The spectral analysis revealed the presence of dominant shedding frequencies for certain ranges of the geometric angle of attack. Two dominant shedding modes were identified: One was associated with bluff body vortex shedding, and the other was associated with low Strouhal number shedding. No dominant shedding frequencies were observed for angles of attack beyond 50°. The research improves on our current understanding of the unsteady nature of the stall regime, along with providing insight into the existence of vortex‐induced vibrations on a wind turbine in standstill conditions.
Highlights
In modern times, sustainable energy resources like wind power might be the answer to global warming and air pollution
3D airfoil polars were recreated from standstill measurements and compared against 2D airfoil polars and flat plate theory results to verify the measurements
Wind turbines frequently operate at off‐design conditions during their life cycle and undergo dynamic loads characterized by unsteady aerodynamics
Summary
Sustainable energy resources like wind power might be the answer to global warming and air pollution They need to contend against conventional fossil fuel–based energy systems on an economical front. The levelized cost of wind energy needs to continue to decrease, and the social acceptance towards wind energy needs to increase Realizing this goal solicits a trend in developing larger wind turbines. Wind turbines frequently operate at off‐design conditions during their life cycle and undergo dynamic loads characterized by unsteady aerodynamics. Predicting these unsteady aerodynamic loads has been very difficult because of the nonlinear nature of unsteady aerodynamics. When operating near the stall region and in deep stall, these turbines are prone to increased loads because of the dynamic nature of stall
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