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Title: Measurements and predictions of wind turbine tower shadow and fairing effects

Abstract

Downwind two-bladed rotor configurations can have advantages in reducing rotor mass for wind turbines, compared with three-bladed upwind designs. However, the tower shadow adds an aerodynamic complication that can be difficult to quantify and predict. This study presents and analyzes a previously unpublished subset of data collected during an extensive wind tunnel campaign, the Unsteady Aerodynamic Experiment (UAE). At high tip speed ratios, the tower shadow is a dominating contributor to bending moment oscillations but can be mitigated by the use of a tower fairing when such a fairing is aligned with the flow. At lower tip speed ratios where the blades can undergo aerodynamic stall and hysteresis, tower shadow was only a secondary contributor to bending moments and the tower fairing did not significantly impact bending moments. The aeroelastic simulation code called FAST was used to predict the same experimental conditions. In general, simulations reasonably predicted most of the cycle-averaged aspects, but only qualitatively predicted the unsteady variations due to tower shadow. To improve simulation predictions inside the tower wake, it is suggested that future work model the unsteady wake component associated with cylinder shedding and to consider a wake model for tower fairings at various wind incidence angles.

Authors:
; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1461850
Report Number(s):
NREL/JA-5000-72000
Journal ID: ISSN 0167-6105
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Journal of Wind Engineering and Industrial Aerodynamics
Additional Journal Information:
Journal Volume: 179; Journal Issue: C; Journal ID: ISSN 0167-6105
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; aerodynamic stalling; bending moments; forecasting; wakes; wind tunnels; wind turbines

Citation Formats

Noyes, Carlos, Qin, Chao, Loth, Eric, and Schreck, Scott. Measurements and predictions of wind turbine tower shadow and fairing effects. United States: N. p., 2018. Web. doi:10.1016/j.jweia.2018.06.012.
Noyes, Carlos, Qin, Chao, Loth, Eric, & Schreck, Scott. Measurements and predictions of wind turbine tower shadow and fairing effects. United States. doi:10.1016/j.jweia.2018.06.012.
Noyes, Carlos, Qin, Chao, Loth, Eric, and Schreck, Scott. Wed . "Measurements and predictions of wind turbine tower shadow and fairing effects". United States. doi:10.1016/j.jweia.2018.06.012.
@article{osti_1461850,
title = {Measurements and predictions of wind turbine tower shadow and fairing effects},
author = {Noyes, Carlos and Qin, Chao and Loth, Eric and Schreck, Scott},
abstractNote = {Downwind two-bladed rotor configurations can have advantages in reducing rotor mass for wind turbines, compared with three-bladed upwind designs. However, the tower shadow adds an aerodynamic complication that can be difficult to quantify and predict. This study presents and analyzes a previously unpublished subset of data collected during an extensive wind tunnel campaign, the Unsteady Aerodynamic Experiment (UAE). At high tip speed ratios, the tower shadow is a dominating contributor to bending moment oscillations but can be mitigated by the use of a tower fairing when such a fairing is aligned with the flow. At lower tip speed ratios where the blades can undergo aerodynamic stall and hysteresis, tower shadow was only a secondary contributor to bending moments and the tower fairing did not significantly impact bending moments. The aeroelastic simulation code called FAST was used to predict the same experimental conditions. In general, simulations reasonably predicted most of the cycle-averaged aspects, but only qualitatively predicted the unsteady variations due to tower shadow. To improve simulation predictions inside the tower wake, it is suggested that future work model the unsteady wake component associated with cylinder shedding and to consider a wake model for tower fairings at various wind incidence angles.},
doi = {10.1016/j.jweia.2018.06.012},
journal = {Journal of Wind Engineering and Industrial Aerodynamics},
issn = {0167-6105},
number = C,
volume = 179,
place = {United States},
year = {2018},
month = {8}
}