Design and Experimental Results for the S825 Airfoil; Period of Performance: 1998-1999
A 17%-thick, natural-laminar-flow airfoil, the S825, for the 75% blade radial station of 20- to 40-meter, variable-speed and variable-pitch (toward feather), horizontal-axis wind turbines has been designed and analyzed theoretically and verified experimentally in the NASA Langley Low-Turbulence Pressure Tunnel. The two primary objectives of high maximum lift, relatively insensitive to roughness and low-profile drag have been achieved. The airfoil exhibits a rapid, trailing-edge stall, which does not meet the design goal of a docile stall. The constraints on the pitching moment and the airfoil thickness have been satisfied. Comparisons of the theoretical and experimental results generally show good agreement.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC36-99-GO10337
- OSTI ID:
- 15011673
- Report Number(s):
- NREL/SR-500-36346; AAF-4-14289-01; AAM-8-17232-01; TRN: US200507%%632
- Resource Relation:
- Other Information: PBD: 1 Jan 2005; Related Information: Work performed by Airfoils, Inc., State College, Pennsylvania
- Country of Publication:
- United States
- Language:
- English
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