bladex.blade.Blade._planar_to_cylindrical¶

Blade._planar_to_cylindrical()[source]¶

Private method that transforms the 2D planar airfoils into 3D cylindrical sections.

The cylindrical transformation is defined by the following formulas:

$x = x_{i} \qquad \forall x_i \in X$

$y = r \sin\left( \frac{y_i}{r} \right) \qquad \forall y_i \in Y$

$z = -r \cos\left( \frac{y_i}{r} \right) \qquad \forall y_i \in Y$

After transformation, the method also fills the numpy.ndarray “blade_coordinates_up” and “blade_coordinates_down” with the new $(X, Y, Z)$ coordinates.