UAE6 - Wind Tunnel Tests Data - UAE6 - Sequence L - Raw Data

**Overview**

Sequence L: Step AOA, Parked (P)

This sequence was designed to quantify the 3-D blade static angle-of-attack response in the
absence of rotational influences by varying the blade pitch angle. This test sequence used an
upwind, rigid turbine with a 0° cone angle. Wind speeds of 20 m/s and 30 m/s were used, and all
data were collected at a yaw angle of 0°. The rotor was parked with the instrumented blade fixed
at 0° azimuth, and the rotor lock was installed (see Appendix A). Blade and probe pressure
measurements were collected. 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.

The blade pitch angle ramped continuously at 0.18°/s over a wide range of increasing and
decreasing pitch angles. A step sequence was also performed. The blade pitch was stepped 5°, the
flow was allowed to stabilize, and the pitch angle was held for 8 seconds. Then the pitch angle
step was repeated. Again, a wide range of pitch angles was obtained, both increasing and
decreasing. The file lengths for this sequence varied from 5 to 10 minutes, depending on the pitch
angle range. The file name convention used the initial letter L followed by two digits specifying
wind speed, followed by 00 for yaw angle, followed by RU, RD, or ST, followed by the repetition
digit. The angle-of-attack motion was differentiated by RU (ramp up), RD (ramp down), and ST
(step down, then step up). This sequence is related to sequences K and R.

**Data Details**

File naming information can be found in the attached Word document "Sequence L Filename Key", copied from the Phase VI Test Report.