Challenges in modelling the unsteady aerodynamics of wind turbines

TLDR

Many aerodynamic phenomena affecting wind turbines are known, yet the flow details remain poorly understood and challenging to predict accurately, and fundamental model limits and ambiguities complicate proper application. The article calls for continued focus on modelling rotor wakes and blade‑section unsteady aerodynamics, urging analysts to combine experimental data and modelling to better understand turbine aerodynamics and develop more rigorous, broadly applicable models. Issues discussed include modelling the induced velocity field from the vortical wake behind the turbine, various unsteady aerodynamic problems of blade sections, and the nonlinear intricacies of dynamic stall. © 2002 John Wiley & Sons, Ltd.

Abstract

Abstract Many of the aerodynamic phenomena contributing to the observed effects on wind turbines are now known, but the details of the flow are still poorly understood and are challenging to predict accurately. This article emphasizes two key areas that need continued serious consideration for wind turbine predictive analyses: the modelling of the rotor wake and the modelling of the unsteady aerodynamics of the blade sections. Issues discussed herein include the modelling of the induced velocity field produced by the vortical wake behind the turbine, the various unsteady aerodynamic issues associated with the blade sections, and the non‐linear intricacies of dynamic stall. Fundamental limits exist in the capabilities of all models, and ambiguities can also arise in how these models should be properly applied. A challenge for analysts of the future is to use complementary experimental measurements and modelling techniques to better understand the aerodynamic problems found on wind turbines, and to develop more rigorous models with wider ranges of application. Copyright © 2002 John Wiley & Sons, Ltd.