Site effects on wind characteristics at a turbine rotor
Enough measurements of wind characteristics at two different types of turbine sites have now been completed to support a useful preliminary description of the effect of a site on the wind. This paper discusses the effect of terrain, with minimal reference to atmospheric static stability and other processes, on the wind at two sites. The turbulent wind at each site was measured with a set of anemometers equally spaced in a crosswind circular array. Turbulence intensities range from less than 0.10 to greater than 0.25. Time series of wind speed at each site are characterized in both the Eulerian coordinate system and the rotating system of the turbine rotor. A straightforward rotational sampling of wind measurements is used with each vertical plane array (VPA). The differences in turbulence characteristics are discussed in relation to the complexity of the site terrain. The potential impact on a rotor is discussed briefly. The primary turbulence properties of importance in determining rotor blade forcing, energy, and size of turbulence eddies carrying most of the energy are found to vary substantially. The conclusions are tentative and suggest a plan of research that promises to most effectively provide a practical model of the effect of terrain on the turbulent wind characteristics and thus on the fluctuating response of wind turbines as a function of the site characteristics.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5536870
- Report Number(s):
- PNL-SA-15103; CONF-871062-12; ON: DE88005135
- Resource Relation:
- Conference: Windpower '87, San Francisco, CA, USA, 5 Oct 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Input turbulence features at a megawatt-size wind turbine at Medicine Bow, Wyoming
Input turbulence features at a megawatt-size wind turbine, Medicine Bow, Wyoming