T., Lindenburg, C., Winkelaar, D., and van der Hooft, E. Technical Report NREL/TP-500-38060, National Renewable Energy Laboratory, Golden, CO, 2009. Definition of a 5-MW reference wind turbine for offshore systemĭevelopment. H Jonkman J, Butterfield S, Musial W, Scott G. I have written a lot because i thought it will help others who may be doing something similar to me, hope this is ok. But the information regarding the tangential position on the airfoil, where the pitch axis passes through is not available especially that fact that LMH64-5 is a prebend blade, therefore this information is vital to create an accurate geometry of the blade.Ĭould anyone please help to with my question regarding the exact airfoil sections used and how they are stacked along the NREL 5MW rotor blade? Lastly from the NREL document, I was able to obtain the axial position on the airfoil section where the pitch axis passes through (AeroCent-0.25). Hence I’m not entirely sure which airfoil section the NREL have used for their 5MW baseline rotor. There is also another uncertainty that arises in the airfoil sections, the DU airfoils particularly DU 99 W 405 LM & DU 99 W 350 LM has an adjusted form(see atached image). TU Delft have informed me that all the airfoils used in the LMH64-5 DOWEC blade are ‘probably’ the LM profiles.

‘_A17’ indicate that the blade section has an aspect ratio of 17. DU 99 W 405 LM is the DU 99 W 405 airfoil with smaller trailing edge thickness. LM indicates original blade with a reduced trailing edge thickness i.e. Here is what I have decrypted from comparing NREL and DOWEC publications. In the NREL 5MW document the airfoils are given are in an abbreviated form, but using the DOWEC document, the airfoil names used on the LMH64-5 blade can be obtained with some confusions. Unfortunately I have been unsuccessful in obtaining the geometric definition of LMH64-5 blade, except the DOWEC paper. The geometry of the NREL 5MW blade is based on the LMH64-H blade (reduced rotor and hub diameter), which was initially used on the DOWEC 6MW rotor. I’ll give a summary what I have gathered so far. My research is focused on aerodynamics of wind turbine, At the moment I’m trying to build CAD model of the NREL 5MW baseline rotor so I can make a GRID and undertake a CFD analysis, but having some difficulties with the geometric definition that are available regarding the NREL 5MW rotor.

Firstly I would like to say I’m privileged to have access to the forum.

Airfoil blade