Results for Turbine A
Cl in Variable Wind Mode
Comparison with the NREL CER III is made for Turbine A because of the
similarity of turbine A to the NREL CER. This is the Cl
curves at the 30%, 47%, 63% and 80% span locations along the blade are
shown. The data was generated at 10 segments along the blade span,
from 5% to 95%. Thw wind speed was varied from 7mph to 50mph to
generate the data in the variable wind mode. The data at the above
stations was obtained after linear interpolation of the data
generated. The results of the UIUC model are compared with Corrigan
model and the experimental data of NREL. The 3D effects at the root
stations are high as seen in the experimental data. These effects
reduce to a great extent as we proceed towards the tip of the blade
and the data approaches the 2D data as seen in the figure. The UIUC
model shows this effect.
Cl in Fixed Wind Mode
The predictions using the UIUC model in the above figures is from the
variable wind mode. The data at 25% stations and for the full range of
-180 to +180 deg is shown below for the fixed wind mode. Data
generation in the fixed wind mode is used to generate input files for
the PROP93 and AERODYN programs.
Cl and Cd from -180 deg to 180 deg at
(r/R) = 25%
Power
Below is the power curve generated by the program with Corrigan's
model, UIUC model and plain 2D data uncorrected for 3D effects. The
experimetal data provided by NREL is also shown. Apparently, there is
a big disagreement between the predictions of the model and the
experimental data even though the Cl predictions show a
good match with the experimental data. The NREL CER III is rated at
19.2 kW. It can be seen that the experimental data provided does not
reach the rated power at all. The discrepancies between the
predictions and the experimental data is being investigated.
Power Curve
