The Aerodynamics of the Curled Wake: A Simplified Model in View of Flow Control

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109 Scopus Citations

Abstract

When a wind turbine is yawed, the shape of the wake changes and a curled wake profile is generated. The curled wake has drawn a lot of interest because of its aerodynamic complexity and applicability to wind farm controls. The main mechanism for the creation of the curled wake has been identified in the literature as a collection of vortices that are shed from the rotor plane when the turbine is yawed. This work extends that idea by using aerodynamic concepts to develop a control-oriented model for the curled wake based on approximations to the Navier–Stokes equations. The model is tested and compared to time-averaged results from large-eddy simulations using actuator disk and line models. The model is able to capture the curling mechanism for a turbine under uniform inflow and in the case of a neutral atmospheric boundary layer. The model is then incorporated to the FLOw Redirection and Induction in Steady State (FLORIS) framework and provides good agreement with power predictions for cases with two and three turbines in a row.

Original languageAmerican English
Pages (from-to)127-138
Number of pages12
JournalWind Energy Science
Volume4
Issue number1
DOIs
StatePublished - 2019

Bibliographical note

See NREL/JA-5000-72098 for paper as published in Wind Energy Science Discussions

NREL Publication Number

  • NREL/JA-5000-73451

Keywords

  • aerodynamics
  • control
  • wake
  • wind turbines
  • yaw

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