A sonic anemometer is located on the tail of the wind turbine just upwind of the tail fin at approximately 3.26 m (10.7 ft.) from the rotor plane at the centerline of the shaft. Specifications for the sensor may be found in Appendix C.
A sonic anemometer was located at hub height (24.4 m [80 ft]) on a meteorological tower (Figure 11) located 19.8 m (64.9 ft) upwind from the turbine and at a height of 24.4 m (80 ft). The distance from the sonic anemometer to the turbine was 3.5 rotor diameters for Configurations A and B and 3 rotor diameters for Configuration C. The sonic anemometer also recorded the temperature. In addition to the sonic anemometer, a barometric pressure sensor was located in the up-tower junction box. Adjacent to the up-tower junction box was a wind vane that was used as a secondary measurement device with the primary wind direction derived from the sonic anemometer data. Three mechanical anemometers were located on the meteorological tower at heights of 23.4 m (76 ft), 13.7 m (45 ft), and 3.0 m (9.8 ft). Specifications and calibration data for the meteorological sensors can be found in Appendix C.
Also mounted on the meteorological tower was a Panasonic WV-CL830 camera with a Pelco model PT570P pan and tilt control. A Panasonic video monitor and recorder was used to record video footage of the turbine.
In addition to the meteorological data described, data for the inflow analysis used the gradient Richardson number (NRi) for height of 2-80 m that was obtained from a meteorological tower at the NWTC and included in the data sets for the SWRT.
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