skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Similarity of wake meandering for different wind turbine designs for different scales

Abstract

The wake meandering characteristics of four different wind turbine designs with diameters ranging from a few centimetres (wind tunnel scale) to a hundred metres (utility scale) are investigated using large-eddy simulation with the turbine blades and nacelle parametrised using a new actuator surface model. Different velocity fields and meandering behaviours are observed at near-wake locations. At far-wake locations, on the other hand, the mean velocity deficit profiles begin to collapse when scaled by the centreline velocity deficit based on the incoming wind speed at turbine hub height, suggesting far-wake similarity across scales. The turbine-added turbulence kinetic energy profiles are shown to also nearly collapse with each other in the far wake when normalised using a velocity scale defined by the thrust on the turbine rotor. Moreover, we show that at far-wake locations, the simulated flow fields for all four turbine designs exhibit similar wake meandering characteristics in terms of (1) a Strouhal number independent of rotor designs of different sizes and (2) the distributions of wake meandering wavelengths and amplitudes when normalised by the rotor diameter and a length scale defined by the turbine thrust respectively.

Authors:
; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States); Lockheed Martin Corpration, Litteton, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1538920
DOE Contract Number:  
EE0002980; EE0005482; AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Journal of Fluid Mechanics
Additional Journal Information:
Journal Volume: 842; Journal ID: ISSN 0022-1120
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
Mechanics; Physics

Citation Formats

Foti, Daniel, Yang, Xiaolei, and Sotiropoulos, Fotis. Similarity of wake meandering for different wind turbine designs for different scales. United States: N. p., 2018. Web. doi:10.1017/jfm.2018.9.
Foti, Daniel, Yang, Xiaolei, & Sotiropoulos, Fotis. Similarity of wake meandering for different wind turbine designs for different scales. United States. doi:10.1017/jfm.2018.9.
Foti, Daniel, Yang, Xiaolei, and Sotiropoulos, Fotis. Tue . "Similarity of wake meandering for different wind turbine designs for different scales". United States. doi:10.1017/jfm.2018.9.
@article{osti_1538920,
title = {Similarity of wake meandering for different wind turbine designs for different scales},
author = {Foti, Daniel and Yang, Xiaolei and Sotiropoulos, Fotis},
abstractNote = {The wake meandering characteristics of four different wind turbine designs with diameters ranging from a few centimetres (wind tunnel scale) to a hundred metres (utility scale) are investigated using large-eddy simulation with the turbine blades and nacelle parametrised using a new actuator surface model. Different velocity fields and meandering behaviours are observed at near-wake locations. At far-wake locations, on the other hand, the mean velocity deficit profiles begin to collapse when scaled by the centreline velocity deficit based on the incoming wind speed at turbine hub height, suggesting far-wake similarity across scales. The turbine-added turbulence kinetic energy profiles are shown to also nearly collapse with each other in the far wake when normalised using a velocity scale defined by the thrust on the turbine rotor. Moreover, we show that at far-wake locations, the simulated flow fields for all four turbine designs exhibit similar wake meandering characteristics in terms of (1) a Strouhal number independent of rotor designs of different sizes and (2) the distributions of wake meandering wavelengths and amplitudes when normalised by the rotor diameter and a length scale defined by the turbine thrust respectively.},
doi = {10.1017/jfm.2018.9},
journal = {Journal of Fluid Mechanics},
issn = {0022-1120},
number = ,
volume = 842,
place = {United States},
year = {2018},
month = {3}
}