Journal
RENEWABLE ENERGY
Volume 171, Issue -, Pages 687-708Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.02.078
Keywords
Wind turbine; Wake model; Wake deficit; Double-Gaussian; Analytical model; Aerodynamics
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The recently proposed analytical wake model for a horizontal axis utility scale wind turbine is revisited, revised and improved based on conservation of momentum and the assumption of a double-Gaussian distribution for the velocity deficit in the wake. The model fitting using lidar wake measurement data reveals characteristics of the wind turbine wake, potentially facilitating analytic calculations and improving understanding of wind turbine aerodynamics.
A recently proposed analytical wake model for a horizontal axis utility scale wind turbine is revisited, and revised and improved. The model is based upon conservation of momentum in the context of actuator disc theory, and the assumption of a distribution of the double-Gaussian type for the velocity deficit in the wake. The model is developed and improved and reveals characteristics of the wind turbine wake velocity deficit for the full wake, including the near-wake to within close proximity of the wind turbine rotor. Full 2-dimensional model fitting to lidar wake measurement data obtained from a 5 MW utility scale wind turbine is carried out for the full range of inflow wind velocities of primary interest. Such a full wind turbine wake model has the potential to facilitate analytic calculations within the wind turbine wake region, and the potential to improve understanding of wind turbine aerodynamics. (c) 2021 Elsevier Ltd. All rights reserved.
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