Sequences S, T, and U: Upwind, No Probes (F)
Upwind 2� Pitch (F)
Upwind 4� Pitch (F) This test sequence used an upwind, rigid turbine with a 0� cone angle. The wind speed ranged from 5 m/s to 25 m/s. Yaw angles of 0� to 180� were achieved for Sequence S, but the yaw angle remained at 0� for Sequences T and U. The blade tip pitch was 3� for Sequence S, 2� for Sequence T, and 4� for Sequence U. These three sequences were interleaved during testing because the pitch angle change was easily made by the turbine operator. The rotor rotated at 72 RPM. Blade pressure measurements were collected. The five-hole probes were removed and the plugs were installed. Plastic tape 0.03-mm-thick was used to smooth the interface between the plugs and the blade. The teeter dampers were replaced with rigid links, and these two channels were flagged as not applicable by setting the measured values in the data file to -99999.99 Nm. The teeter link load cell was pre-tensioned to 40,000 N. During post-processing, the probe channels were set to read -99999.99. In addition to the standard 30-second campaigns, yaw sweeps were done at 7 m/s and 10 m/s for the Sequence S configuration. These 6-minute campaigns were collected while the yaw drive rotated the turbine 360� at a rate of 1�/s. The file names for these campaigns use the letter designation, followed by two digits for wind speed, followed by YSU, followed by 00.