In reference to the Aerodyn model and turbine definition data in the repository
and the definition document I would like to ask the following:
How are the geometry and the polars of the 50 aerofoil sections in the Aerodyn model derived from the 8 ‘mother’ aerofoil sections described in the definition document of the wind turbine?
And furthermore, why is the reference point for the polars not the same for all the sections?
I understand this is an arbitrary point but it still interests me to know why it is not chosen as e.g. 0.25 for all the aerofoil sections? Is the reference point the theoretical Aerodynamic Centre: the location with respect to which the pitching moment does not change for small changes in the angle of attack?
Thank you for answering my questions.
If I understand correctly the thickness/chord is interpolated from the thickness/chord of the ‘parent’ sections at their appropriate span wise stations to a full span wise distribution of the thickness/chord.
Next the aerofoil properties are interpolated based on the local thickness/chord value at a particular span wise station.