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

**Overview**

Sequence N: Sin AOA, Rotating (P)

This sequence was designed to quantify the blade 3-D unsteady aerodynamic response in the
presence of rotational influences by varying blade pitch angle. Test sequence N used an upwind,
rigid turbine with a 0° cone angle. The wind speed was 15 m/s, and the yaw angle was 0°
throughout the sequence. The rotor rotated at 72 RPM. 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.

Sinusoidal angle-of-attack histories were designed to emulate 2-D S809 dynamic data obtained at
the Ohio State University (OSU) wind tunnel (Reuss Ramsey et al. 1995) and the 1P yawed flow
angle-of-attack variations the turbine could be expected to encounter in routine operation. The
reduced frequency (K), mean angle of attack (?m), and oscillation amplitude (??) were computed
for each of the five primary span locations. The file lengths varied according to the time required
to complete 40 oscillations at the specified frequency. The file name convention used the
sequence designation N, followed by two digits for the span location (30, 47, 63, 80, or 95),
followed by two digits representing the condition specified in the test matrix, followed by the
repetition digit. Due to time constraints, most of the test conditions corresponding to the 63%
span location were eliminated. Test points with a
static pitch angle of 3° were collected throughout the sequence to ascertain instrumentation fidelity.

**Data Details**

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