Dear Kishore,
Your understanding of the airfoil names of the NREL 5-MW baseline wind turbine is correct. Marshall is also correct in that the NREL 5-MW specifications report ([1]) was never meant to include enough detail to develop a CAD model or CFD mesh.
That said, the NREL 5-MW turbine has been used around the world for many conceptual design and analysis studies–including being adopted as the reference turbine in the EU UpWind research program, the IEA Wind Task 23 OC3 project, and the IEA Wind Task 30 OC4 project. Due to its widespread use, there have been several groups who have developed CAD models and CFD meshes of this turbine. Each one has had to take a number of liberties when they defined the external shape of the blade (and other turbine components) needed to create such a model. Examples of groups who have developed CFD meshes of the NREL 5-MW turbine include the University of California-Davis, the University of California-San Diego, and Risø DTU of Denmark. I also know that the University of Maine has also developed a CAD model of the the NREL 5-MW blade. I suggest you contact one of the developers of these models to see what liberties they took in their model development.
The true LMH64-5 blade has built-in prebend to increase tower clearance. However, as stated in [1], the NREL 5-MW baseline turbine simplifies the blade by replacing the prebend with a 2.5 deg upwind blade precone.
The definition of AeroCent has been confusing to many and we plan to change the FAST inputs to remedy this. Until then, please note that AeroCent in FAST is used to locate the reference point relative to the pitch axis for which aerodynamic (lift, drag, pitching) coefficients are defined. AeroCent in FAST is defined as follows:
AeroCent = 0.25 - [ (fraction of chord from leading edge to actual pitch axis) - (fraction of chord from leading edge to aerodynamic coefficient reference point) ]
(The 0.25 in the equation above comes from FAST’s assumption that the pitch axis passes through 25% chord.)
We plan to update FAST by replacing input AeroCent with two new inputs as follows:
PitchAxis = Fraction of chord from leading edge to pitch axis
AeroRef = Fraction of chord from leading edge to aerodynamic coefficient reference point
Thus:
AeroCent = 0.25 - [ PitchAxis - AeroRef ]
I never actual specified the values of PitchAxis or AeroRef in the specifications report for the NREL 5-MW wind turbine. However, for your reference, the values are as follows:
Radius BlFract PitchAxis AeroRef
(m) (-) (-) (-)
1.50 0.00000 0.50000 0.50000
1.70 0.00325 0.50000 0.50000
2.70 0.01951 0.49951 0.49902
3.70 0.03577 0.49510 0.49020
4.70 0.05203 0.48284 0.46569
5.70 0.06829 0.47059 0.44118
6.70 0.08455 0.45833 0.41667
7.70 0.10081 0.44608 0.39216
8.70 0.11707 0.43382 0.36765
9.70 0.13335 0.42156 0.34311
10.70 0.14959 0.40931 0.31863
11.70 0.16585 0.39706 0.29412
12.70 0.18211 0.38481 0.26962
13.70 0.19837 0.37500 0.25000
14.70 0.21465 0.37500 0.25000
15.70 0.23089 0.37500 0.25000
16.70 0.24715 0.37500 0.25000
17.70 0.26341 0.37500 0.25000
19.70 0.29595 0.37500 0.25000
21.70 0.32846 0.37500 0.25000
23.70 0.36098 0.37500 0.25000
25.70 0.39350 0.37500 0.25000
27.70 0.42602 0.37500 0.25000
29.70 0.45855 0.37500 0.25000
31.70 0.49106 0.37500 0.25000
33.70 0.52358 0.37500 0.25000
35.70 0.55610 0.37500 0.25000
37.70 0.58862 0.37500 0.25000
39.70 0.62115 0.37500 0.25000
41.70 0.65366 0.37500 0.25000
43.70 0.68618 0.37500 0.25000
45.70 0.71870 0.37500 0.25000
47.70 0.75122 0.37500 0.25000
49.70 0.78376 0.37500 0.25000
51.70 0.81626 0.37500 0.25000
53.70 0.84878 0.37500 0.25000
55.70 0.88130 0.37500 0.25000
56.70 0.89756 0.37500 0.25000
57.70 0.91382 0.37500 0.25000
58.70 0.93008 0.37500 0.25000
59.20 0.93821 0.37500 0.25000
59.70 0.94636 0.37500 0.25000
60.20 0.95447 0.37500 0.25000
60.70 0.96260 0.37500 0.25000
61.20 0.97073 0.37500 0.25000
61.70 0.97886 0.37500 0.25000
62.20 0.98699 0.37500 0.25000
62.70 0.99512 0.37500 0.25000
63.00 1.00000 0.37500 0.25000
You should be able to match the AeroCent data provided in the specifications report with the PitchRef and AeroRef data above.
I hope that helps.
Best regards,