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Title: Distributed Aerodynamic Control using Active Trailing-Edge Flaps for Large Wind Turbines

Abstract

This work presents a numerical framework to investigate distributed aerodynamic control devices for application in large wind turbines. Tool capabilities were extended to facilitate multiple aerodynamic polar tables. The airfoil aerodynamics characteristics were automatically determined, and blade-pitch, generator-torque, and trailing-edge-flap controllers were tuned in-the-loop according to a specific blade design. This automated workflow allows analysis and optimization of trailing-edge flaps, enabling codesign studies. Results targeted reductions of root-flap-bending moment derivatives. The applied trailing-edge-flap control reduced the standard deviation of root-flap-bending moments by more than 6% and benefit related parameters, e.g., reduce blade-tip deflections, by up to 8%. Because of varying thrust distributions along the blade span, different flap designs have nonlinear characteristics in terms of the control objective and show best performance when located at the radial position with maximum thrust. In general, larger flaps provide a greater influence to reduce the target control objective.

Authors:
 [1];  [2]; ORCiD logo [1]; ORCiD logo [1];  [3]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
  3. Rose-Hulman Inst. of Technology, Terre Haute, IN (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office
OSTI Identifier:
1665813
Report Number(s):
NREL/JA-5000-76357
Journal ID: ISSN 1742-6588; MainId:7157;UUID:fe791f4c-7364-ea11-9c31-ac162d87dfe5;MainAdminID:17353
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 1618; Journal ID: ISSN 1742-6588
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
49 EE - Wind and Water Power Program - Wind (EE-4W); distributed aerodynamic control; active trailing-edge flaps; MDAO; large rotors

Citation Formats

Feil, Roland, Abbas, Nikhar, Bortolotti, Pietro, Johnson, Nicholas, and Mertz, Ben. Distributed Aerodynamic Control using Active Trailing-Edge Flaps for Large Wind Turbines. United States: N. p., 2020. Web. doi:10.1088/1742-6596/1618/4/042026.
Feil, Roland, Abbas, Nikhar, Bortolotti, Pietro, Johnson, Nicholas, & Mertz, Ben. Distributed Aerodynamic Control using Active Trailing-Edge Flaps for Large Wind Turbines. United States. doi:10.1088/1742-6596/1618/4/042026.
Feil, Roland, Abbas, Nikhar, Bortolotti, Pietro, Johnson, Nicholas, and Mertz, Ben. Tue . "Distributed Aerodynamic Control using Active Trailing-Edge Flaps for Large Wind Turbines". United States. doi:10.1088/1742-6596/1618/4/042026. https://www.osti.gov/servlets/purl/1665813.
@article{osti_1665813,
title = {Distributed Aerodynamic Control using Active Trailing-Edge Flaps for Large Wind Turbines},
author = {Feil, Roland and Abbas, Nikhar and Bortolotti, Pietro and Johnson, Nicholas and Mertz, Ben},
abstractNote = {This work presents a numerical framework to investigate distributed aerodynamic control devices for application in large wind turbines. Tool capabilities were extended to facilitate multiple aerodynamic polar tables. The airfoil aerodynamics characteristics were automatically determined, and blade-pitch, generator-torque, and trailing-edge-flap controllers were tuned in-the-loop according to a specific blade design. This automated workflow allows analysis and optimization of trailing-edge flaps, enabling codesign studies. Results targeted reductions of root-flap-bending moment derivatives. The applied trailing-edge-flap control reduced the standard deviation of root-flap-bending moments by more than 6% and benefit related parameters, e.g., reduce blade-tip deflections, by up to 8%. Because of varying thrust distributions along the blade span, different flap designs have nonlinear characteristics in terms of the control objective and show best performance when located at the radial position with maximum thrust. In general, larger flaps provide a greater influence to reduce the target control objective.},
doi = {10.1088/1742-6596/1618/4/042026},
journal = {Journal of Physics. Conference Series},
number = ,
volume = 1618,
place = {United States},
year = {2020},
month = {9}
}

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Works referenced in this record:

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