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I'm running a numerical data model of a wind turbine. I know the blade in question is an S814, as described in the NREL documentation here. I have the necessary blade size data in a MATLAB file shown below:

Screenshot of a Matlab variable file containing the next data: alpha_Cd, alpha_Cl, Cd_data, Cl_data, cdist, Cdr, rd and thetad

So far, I know that Cd and Cl are the drag and lift data, thetad is the angle and cdist is the chord distribution. But then I have the these questions to make sense of the data:

  1. What is the section area? Is it the total area of the blade between two lines when I cut it into pieces? And why is it constant? Should it not be, or is it?
  2. The variables cdr and rd are two variables whose meanings I do not understand. I only know that both have the same values as shown below, which suggests that they are geometric properties of the blade at a certain section, I suppose?

Screeenshoot showing the data of the Cdr and rd variables which are unidimensional rows of values that have the next values: 0.200000000000000, 0.266000000000000, 0.333, 0.400, 0.466, 0.5333, 0.600, 0.666, 0.733, 0.800, 0.866, 0.933, 1

The only other clue I have is that Cdr an rd are multiplied by the radius of the section as shown in the code below:

Matlab code showing the next lines: cdist = cdistR; rd = rdR; cdr = cdr*R; r_plot = el_pos./R;

I will keep diving to know how to do it but any idea or advice will be really helpful.

Fred
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mrmurmanks
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