Abstract
The objectives of this study were to verify the predictions of the Eppler Airfoil Design and Analysis Code for Reynolds numbers up to 6 x 106 and to acquire the section characteristics of two airfoils being considered for large, megawatt-size wind turbines. One airfoil, the S825, was designed to achieve a high maximum lift coefficient suitable for variable-speed machines. The other airfoil, theS827, was designed to achieve a low maximum lift coefficient suitable for stall-regulated machines. Both airfoils were tested in the NASA Langley Low-Turbulence Pressure Tunnel (LTPT) for smooth, fixed-transition, and rough surface conditions at Reynolds numbers of 1, 2, 3, 4, and 6 x 106. The results show the maximum lift coefficient of both airfoils is substantially underpredicted for Reynoldsnumbers over 3 x 106 and emphasized the difficulty of designing low-lift airfoils for high Reynolds numbers.
Original language | American English |
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Number of pages | 14 |
State | Published - 2000 |
Event | ASME Wind Energy Symposium - Reno, Nevada Duration: 10 Jan 2000 → 13 Jan 2000 |
Conference
Conference | ASME Wind Energy Symposium |
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City | Reno, Nevada |
Period | 10/01/00 → 13/01/00 |
NREL Publication Number
- NREL/CP-500-27891