Improving actuator disk wake model

The Science of Making Torque from Wind 2014

Gomes, V.M.M.G. Costa^1 ; Palma, J.M.L.M.^1 ; Lopes, A Silva^1

Centre for Wind Energy and Atmospheric Flows, Faculdade de Engenharia da Universidade Do Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal^1

关键词: Atmospheric flows;    Blade element methods;    Data requirements;    Iterative algorithm;    Load distributions;    Parametrizations;    Undisturbed flows;    Wind energy industry;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/524/1/012170/pdf
DOI  :  10.1088/1742-6596/524/1/012170

来源: IOP

【 摘 要 】

The wind energy industry has traditionally relied on simple wake models for estimating Wind Turbine (WT) wake losses. Despite limitations, low requirements in terms of detailed rotor information makes their use feasible, unlike more complex models, such as Blade Element Method (BEM) or Actuator Line. Froude's Actuator Disk (AD) does not suffer the simpler model's limitation of prescribing the wake through a closed set of equations, while sharing with them the low rotor data requirements. On the other hand they require some form of parametrization to close the model and calculate total thrust acting on the flow. An Actuator Disk model was developed, using an iterative algorithm based on Froude's one-dimensional momentum theory to determine the WT's performance, proving to be successful in estimating the performance of both machines in undisturbed flow and in the wake of an upstream machines. Before Froude's AD limitations compared to more complex rotor models, load distributions emulating those of a BEM model were tested. The results show that little impact is obtained at 3 rotor diameters downstream and beyond, agreeing with common definition of a far-wake that starts at 1-2 diameters downstream, where rotor characteristics become negligible and atmospheric flow effects dominate.