Design of a Tapered and Twisted Blade for the NREL Combined Experiment Rotor

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A tapered/twisted blade was designed to operate on the Combined Experiment Rotor (CER) of the National Renewable Energy Lab., which is a stall-regulated downwind wind turbine having a rated power of 20 kilowatt. The geometry of the new blade set was optimized based on annual energy production subject to the constraints imposed on the design. These constraints were mainly related to scientific needs for fundamental research in rotor aerodynamics. A trade-off study was conducted to determine the effect of the different design constraints. Based on the results of this study, which considered nonlinear twist and taper distributions as well as ... continued below

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Giguere, P. & Selig, M. S. April 12, 1999.

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Description

A tapered/twisted blade was designed to operate on the Combined Experiment Rotor (CER) of the National Renewable Energy Lab., which is a stall-regulated downwind wind turbine having a rated power of 20 kilowatt. The geometry of the new blade set was optimized based on annual energy production subject to the constraints imposed on the design. These constraints were mainly related to scientific needs for fundamental research in rotor aerodynamics. A trade-off study was conducted to determine the effect of the different design constraints. Based on the results of this study, which considered nonlinear twist and taper distributions as well as the NREL S809, S814, S822 and S823 airfoils, a blade having a linear taper and a nonlinear twist distribution that uses the S809 airfoil from root to tip was selected. This blade configuration is the logical continuation of the previous constant-chord twisted and untwisted blade sets and will facilitate comparison with those earlier blades. Despite the design constraints based on scientific needs, the new blade is more representative of commercial blades than the previous blade sets.

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OSTI as DE00750919

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  • Other Information: Supercedes report DE00750919; PBD: 12 Apr 1999

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  • Report No.: NREL/SR--500-26173
  • Grant Number: AC36-99GO10337
  • DOI: 10.2172/750919 | External Link
  • Office of Scientific & Technical Information Report Number: 750919
  • Archival Resource Key: ark:/67531/metadc707792

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • April 12, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • March 31, 2016, 2:16 p.m.

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Giguere, P. & Selig, M. S. Design of a Tapered and Twisted Blade for the NREL Combined Experiment Rotor, report, April 12, 1999; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc707792/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.