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Sensitivity of wind turbine airfoil sections to geometry variations inherent in modular blades

Sensitivity of wind turbine airfoil sections to geometry variations inherent in modular blades In the ongoing work to increase the efficiency of large-scale, horizontal-axis wind turbines, the modular blade concept has been proposed. This article works toward quantifying the aerodynamic performance of modular blades, whose baseline profile remains unchanged from conventional blades but which are susceptible to a larger degree of variation in both manufacturing tolerances and fabrication materials, by examining the effects of offsets in the leading edge and the use of a tensioned membrane-fabric as a flow surface over the aft. Wind tunnel tests were performed on modified DU00-W-212 and DU91-W2-250 sections and included standard pressure measurements, as well as surface deflection measurements of the fabric. For the case of offsets near the nose of the profile, the offsets produce up to 17% decrease in Cl/Cd. For the case of fabric in the aft of the model, the Cl/Cd variations are strongly dependent on the spanwise location of the measurement. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wind Engineering SAGE

Sensitivity of wind turbine airfoil sections to geometry variations inherent in modular blades

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References (29)

Publisher
SAGE
Copyright
© The Author(s) 2018
ISSN
0309-524X
eISSN
2048-402X
DOI
10.1177/0309524X18780376
Publisher site
See Article on Publisher Site

Abstract

In the ongoing work to increase the efficiency of large-scale, horizontal-axis wind turbines, the modular blade concept has been proposed. This article works toward quantifying the aerodynamic performance of modular blades, whose baseline profile remains unchanged from conventional blades but which are susceptible to a larger degree of variation in both manufacturing tolerances and fabrication materials, by examining the effects of offsets in the leading edge and the use of a tensioned membrane-fabric as a flow surface over the aft. Wind tunnel tests were performed on modified DU00-W-212 and DU91-W2-250 sections and included standard pressure measurements, as well as surface deflection measurements of the fabric. For the case of offsets near the nose of the profile, the offsets produce up to 17% decrease in Cl/Cd. For the case of fabric in the aft of the model, the Cl/Cd variations are strongly dependent on the spanwise location of the measurement.

Journal

Wind Engineering – SAGE

Published: Dec 1, 2018

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