NREL 5 MW Hub Radius

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Scott.Larwood
Posts: 98
Joined: Thu May 17, 2007 9:24 am
Location: Stockton, CA

NREL 5 MW Hub Radius

Postby Scott.Larwood » Wed Jun 05, 2013 12:00 pm

Hello,

I think I just noticed this, but why is the NREL 5 MW hub radius so small? It's at 1.5 m, which compares to the WindPACT 1.5 MW at 1.65 m. I don't recall the size of "real" hub radii, but I recall standing up in many a GE 1.5 with some headroom, which makes it seem around 1.5 m radius. And GE/Enron/Tacke was known for having small hubs compared to the rest of the industry.
--
Scott Larwood
Assistant Professor of Mechanical Engineering
University of the Pacific
3601 Pacific Avenue
Stockton, CA 95211

Email: slarwood@pacific.edu
Phone: 209.946.3080
Website: http://web.pacific.edu/x19551.xml

Jason.Jonkman
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Location: Boulder, CO
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Re: NREL 5 MW Hub Radius

Postby Jason.Jonkman » Fri Jun 07, 2013 6:52 am

Hi Scott,

The 1.5-m hub radius of the NREL 5-MW turbine was chosen to be the same as that of the REpower 5M turbine; I agree that it is smaller than most hubs for turbines of that size.

This specification of a small hub radius has caused some problems -- a few years back we were asked from someone developing a CFD model of the NREL 5-MW turbine why the root chord (about 3.5 m) is larger than hub diameter (3.0 m). I agree that this is not realistic. This resulted by forming the NREL 5-MW model from a composite of information from other 5-MW conceptual designs and real prototypes. It is not really a problem for most aero-elastic models, which model the rotor aerodynamics using a form of blade-element/momentum (BEM) theory (as was the purpose for making this model in the first place), which is probably why I didn’t notice this issue before publishing.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Scott.Larwood
Posts: 98
Joined: Thu May 17, 2007 9:24 am
Location: Stockton, CA

Re: NREL 5 MW Hub Radius

Postby Scott.Larwood » Mon Jun 10, 2013 5:49 pm

Thank you for the confirmation and clarification. I'll keep modeling with the puny hub for now!
--
Scott Larwood
Assistant Professor of Mechanical Engineering
University of the Pacific
3601 Pacific Avenue
Stockton, CA 95211

Email: slarwood@pacific.edu
Phone: 209.946.3080
Website: http://web.pacific.edu/x19551.xml


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