Blade Element Momentum Theory

A hybrid rotor/propulsor model that combines local blade‑element aerodynamic force calculations with one‑dimensional actuator‑disk/momentum balance applied to concentric annuli, solving for local induction factors so that the blade forces and the momentum change through the rotor disk are mutually consistent; typically assumes steady, axisymmetric or quasi‑steady inflow, no radial flow, and indepe