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Title: Comparison of Mean and Dynamic Wake Characteristics between Research-Scale and Full-Scale Wind Turbines

Comprehensive utility-scale wake measurements from commercial wind plants are difficult to obtain. As a result, research in wind farm aerodynamics is often based on smaller-scale measurements and on numerical experiments. It is therefore crucial for the scientific community to understand how results compare across scales. In this work, three actuator-line large-eddy simulations are performed to investigate the sensitivity of mean and dynamic wake characteristics to changes in hub height (for the same turbine model) and in rotor size and properties (for a research-scale and a land-based-scale rotor at the same hub height). Results reveal that ground proximity has a large effect on wake expansion via turbulent transport of axial momentum and on the magnitude of lateral and vertical meandering. The rotor-size experiment suggests that wakes from different-scale turbines expand similarly when not limited by the ground, but that the meandering magnitude is not easily translatable across scales. Lastly, the short-rotor wake recovers faster than the tall-rotor wake, but the far wakes of the different-sized rotors at the same absolute height are scalable.
Authors:
 [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Report Number(s):
NREL/JA-5000-71372
Journal ID: ISSN 1742-6588
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 1037; Journal ID: ISSN 1742-6588
Publisher:
IOP Publishing
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; large eddy simulation; torque; wakes; wind power; wind turbines
OSTI Identifier:
1462465

Doubrawa, Paula Moreira, Martinez-Tossas, Luis A., Quon, Eliot W., Moriarty, Patrick J., and Churchfield, Matthew J.. Comparison of Mean and Dynamic Wake Characteristics between Research-Scale and Full-Scale Wind Turbines. United States: N. p., Web. doi:10.1088/1742-6596/1037/7/072053.
Doubrawa, Paula Moreira, Martinez-Tossas, Luis A., Quon, Eliot W., Moriarty, Patrick J., & Churchfield, Matthew J.. Comparison of Mean and Dynamic Wake Characteristics between Research-Scale and Full-Scale Wind Turbines. United States. doi:10.1088/1742-6596/1037/7/072053.
Doubrawa, Paula Moreira, Martinez-Tossas, Luis A., Quon, Eliot W., Moriarty, Patrick J., and Churchfield, Matthew J.. 2018. "Comparison of Mean and Dynamic Wake Characteristics between Research-Scale and Full-Scale Wind Turbines". United States. doi:10.1088/1742-6596/1037/7/072053. https://www.osti.gov/servlets/purl/1462465.
@article{osti_1462465,
title = {Comparison of Mean and Dynamic Wake Characteristics between Research-Scale and Full-Scale Wind Turbines},
author = {Doubrawa, Paula Moreira and Martinez-Tossas, Luis A. and Quon, Eliot W. and Moriarty, Patrick J. and Churchfield, Matthew J.},
abstractNote = {Comprehensive utility-scale wake measurements from commercial wind plants are difficult to obtain. As a result, research in wind farm aerodynamics is often based on smaller-scale measurements and on numerical experiments. It is therefore crucial for the scientific community to understand how results compare across scales. In this work, three actuator-line large-eddy simulations are performed to investigate the sensitivity of mean and dynamic wake characteristics to changes in hub height (for the same turbine model) and in rotor size and properties (for a research-scale and a land-based-scale rotor at the same hub height). Results reveal that ground proximity has a large effect on wake expansion via turbulent transport of axial momentum and on the magnitude of lateral and vertical meandering. The rotor-size experiment suggests that wakes from different-scale turbines expand similarly when not limited by the ground, but that the meandering magnitude is not easily translatable across scales. Lastly, the short-rotor wake recovers faster than the tall-rotor wake, but the far wakes of the different-sized rotors at the same absolute height are scalable.},
doi = {10.1088/1742-6596/1037/7/072053},
journal = {Journal of Physics. Conference Series},
number = ,
volume = 1037,
place = {United States},
year = {2018},
month = {6}
}