Data for NREL Airfoils

Discuss acquisition, use, and manipulation of airfoil data.

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Marshall.Buhl
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Re: Data for NREL Airfoils

Postby Marshall.Buhl » Thu Jul 05, 2012 11:38 am

Dear Irfan,

You can find out more about licensing arrangements for the NREL airfoils here:

Code: Select all

[url]https://wind.nrel.gov/airfoils/AirfoilLicensing.html[/url]


The cost to license the airfoils is based upon the size and kind of organization that will use them.


Marshall
Mr. Marshall L. Buhl Jr.
NWTC-3811
National Renewable Energy Laboratory
Golden, CO 80401 USA
Marshall.Buhl@nrel.gov
Voice: +1 (303) 384-6914
Cell: +1 (303) 915-6623
Fax: +1 (303) 384-7079

Eneko.Agirre
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Re: Data for NREL Airfoils

Postby Eneko.Agirre » Thu Jan 10, 2013 4:01 am

Hi everybody,

I am studying the deflection failure on the wind turbine blades. I have done some analysis using ANSYS and matlab programans in order to calculate the blade deflection. FAST is a powerfull tool used in wind turbine calculation, so I want to compare the results with FAST results.

But I have a problem with airfoil data. I have all airfoil data correct except one. I need S818_30 airfoil data and I have S818_27 one. I know that the drag and lift coefficients are not the same. I haven't found it, so I would greatly appreciate if you could provide me or help me.

Thank you very much in advance,

Eneko

Marshall.Buhl
Posts: 437
Joined: Fri Oct 21, 2005 10:22 am
Organization: NREL/NWTC
Location: Boulder, CO
Location: Boulder, CO
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Re: Data for NREL Airfoils

Postby Marshall.Buhl » Fri Jan 11, 2013 5:17 pm

Dear Eneko,

What do you mean by "S818_30?" Is that S818 data for the 30th blade station or something? Generally, people get data at the "pure" locations and then have to interpolate between them to get the intermediate stations. I use our AirfoilPrep spreadsheet to do that.


Marshall
Mr. Marshall L. Buhl Jr.
NWTC-3811
National Renewable Energy Laboratory
Golden, CO 80401 USA
Marshall.Buhl@nrel.gov
Voice: +1 (303) 384-6914
Cell: +1 (303) 915-6623
Fax: +1 (303) 384-7079

Eneko.Agirre
Posts: 12
Joined: Mon Jan 07, 2013 6:11 am
Organization: IK4-Ikerlan
Location: Spain

Re: Data for NREL Airfoils

Postby Eneko.Agirre » Tue Jan 15, 2013 4:18 am

I mean S818 airfoil 30 scaled . As far as I know some airfoils are scaled, I mean, with equal chord (x direction) their y coordinates are farther.

I have found S818 27 scaled file, the file which appear the CD and CL coefficient (Aerodyn input) but no 30 scaled.

Thank you very much for answering my question,

Eneko

Marshall.Buhl
Posts: 437
Joined: Fri Oct 21, 2005 10:22 am
Organization: NREL/NWTC
Location: Boulder, CO
Location: Boulder, CO
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Re: Data for NREL Airfoils

Postby Marshall.Buhl » Fri Jan 18, 2013 11:45 am

Dear Eneko,

I'm not sure what you mean by "scaled." Our airfoil tables are all nondimensional. They all have a chord of 1.0 (unspecified) unit. There is a characteristic thickness to chord ratio for any given airfoil. The S818 is a 21% airfoil (maximum thickness/chord = 0.21). The lift and drag coefficients are independent of the scale of the airfoil. If you double all the dimensions, the lift and drag coefficients will be the same other than for Re effects.

You can read more about the S818 in this report: http://wind.nrel.gov/airfoils/Documents/S816,S817,S818_Design.pdf.

The only data I have for the S818 has coefficients for various Reynolds Numbers. You can get it here: http://wind.nrel.gov/airfoils/Coefficients/S818E.TXT.


Marshall
Mr. Marshall L. Buhl Jr.
NWTC-3811
National Renewable Energy Laboratory
Golden, CO 80401 USA
Marshall.Buhl@nrel.gov
Voice: +1 (303) 384-6914
Cell: +1 (303) 915-6623
Fax: +1 (303) 384-7079


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