Consider a blade divided up into N elements as shown in Figure 4. Each of
the blade elements will experience a slightly different flow as they have a different rotational speed (Ωr), a different chord length (c) and a different twist angle
(γ). Blade element theory involves dividing up the blade into a sufficient number
(usually between ten and twenty) of elements and calculating the flow at each one.
Overall performance characteristics are determined by numerical integration along
the blade span