Test results of NREL 10M, special-purpose family of thin airfoils
- West Texas A&M Univ., Canyon, TX (United States)
Two 25 kW Carter Wind Systems were tested to determine performance differences between production blades and rotors with NREL Special Purpose Thin Airfoils. Blade design, mold preparation, blade production, and testing were conducted. Design tools were created for computer modeling of the blade. The blades had the same twist, taper, and length as production blades. Flap natural frequency was adjusted to be as similar as possible between rotors, as was blade mass, blade center of gravity and rotor moment of inertia. Data collected were; wind speed at hub height, blade root flap & edgewise loads, main shaft torque, azimuth position, teeter angle, yaw angle and electrical power. These data were collected at 128 Hertz for data sets of eight seconds. This data set was then written to hard disk and the cycle repeated resulting in a file containing five and one half minutes of data. A data run consisted of; preflight checkout/warm-up of equipment, preflight calibration/verification of all sensors on both turbines, collection of five files of data (about thirty minutes of data), post flight calibration/verification of sensors. During this high speed data collection period there were a total of twenty-four data runs collected. Data were collected for wind speeds in the range about 7, 10 and 13 m/s. A data matrix was filled for clean, medium and heavy surface roughness. Baseline power curves, parametric pitch variation runs to establish testing pitch settings, high speed data collection runs with and without applied surface roughness were completed and analyzed. Data were compared using simple arithmetic mean, Fast Fourier Transform (FFT) analysis, rainflow counting algorithms and wavelet analysis. The NREL airfoils showed much less sensitivity to surface roughness. There were minimal root bending load differences. Annual energy production during long term operation is being determined. 9 refs., 7 figs.
- Research Organization:
- US Department of Energy (USDOE), Washington DC (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
- OSTI ID:
- 447464
- Report Number(s):
- CONF-960630-; ON: DE97002833; TRN: 97:001056-0029
- Resource Relation:
- Conference: Windpower `96: American Wind Energy Association (AWEA) conference, Denver, CO (United States), 23-27 Jun 1996; Other Information: PBD: [1996]; Related Information: Is Part Of Windpower `96 - Proceedings of the American Wind Energy Association; PB: 682 p.
- Country of Publication:
- United States
- Language:
- English
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