Blade Design Trade-Offs Using Low-Lift Airfoils for Stall-Regulated HAWTs

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A systematic blade design study was conducted to explore the trade-offs in using low-lift airfoils for a 750-kilowatt stall-regulated wind turbine. Tip-region airfoils having a maximum lift coefficient ranging from 0.7-1.2 were considered in this study, with the main objective of identifying the practical lower limit for the maximum lift coefficient. Blades were optimized for both maximum annual energy production and minimum cost of energy using a method that takes into account aerodynamic and structural considerations. The results indicate that reducing the maximum lift coefficient below the upper limit considered in this study increases the cost of energy independently of ... continued below

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Giguere, P.; Selig, M. S. (University of Illinois at Urbana-Champaign) & Tangler, J. L. (National Renewable Energy Laboratory) April 8, 1999.

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A systematic blade design study was conducted to explore the trade-offs in using low-lift airfoils for a 750-kilowatt stall-regulated wind turbine. Tip-region airfoils having a maximum lift coefficient ranging from 0.7-1.2 were considered in this study, with the main objective of identifying the practical lower limit for the maximum lift coefficient. Blades were optimized for both maximum annual energy production and minimum cost of energy using a method that takes into account aerodynamic and structural considerations. The results indicate that reducing the maximum lift coefficient below the upper limit considered in this study increases the cost of energy independently of the wind regime. As a consequence, higher maximum lift coefficient airfoils for the tip-region of the blade become more desirable as machine size increases, as long as they provide gentle stall characteristics. The conclusions are applicable to large wind turbines that use passive or active stall to regulate peak power.

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  • Presented at the ASME/AIAA Wind Energy Symposium, Reno, NV (US), 01/11/1999--01/14/1999

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  • Other: DE00006937
  • Report No.: NREL/CP-500-26091
  • Grant Number: AC36-99GO10337
  • Office of Scientific & Technical Information Report Number: 6937
  • Archival Resource Key: ark:/67531/metadc711944

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

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  • April 8, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 31, 2016, 6:09 p.m.

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Giguere, P.; Selig, M. S. (University of Illinois at Urbana-Champaign) & Tangler, J. L. (National Renewable Energy Laboratory). Blade Design Trade-Offs Using Low-Lift Airfoils for Stall-Regulated HAWTs, article, April 8, 1999; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc711944/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.