Fluid Mechanics and Thermodynamics of Turbomachinery, 5e

372 Fluid Mechanics, Thermodynamics of Turbomachinery
Blade twist (deg)
30
20
10
0
0
0.2 0.4
Radius ratio, r/R
0.6 0.8 1.0
FIG. 10.30. Rotor blade tested in the NASA Ames wind tunnel showing the chord and
twist distributions (Tangler 2002, courtesy NREL).
Rotor power, kW
14
12
10
8
6
4
2
Tip pitch = 3 deg toward feather
CER/NASA
PROP93, OSU data, flat plate
WTPERF, OSU data, flat plate
LSWT, OSU data, flat plate
0
0.0 5.0 10.0 15.0 20.0 25.0
FIG. 10.31. Measured power output (CER/NASA) for the 10m diameter wind turbine
compared with theoretical predictions (Tangler 2002, courtesy NREL).
30.0