Blade Element Momentum Theory (BEMT) Calculator

Blade Element Momentum Theory (BEMT) Equation

$$ dT = \frac{1}{2} \rho v^2 c C_T dr $$ where:

dT = Thrust generated by a blade element (N)

ρ = Air density (kg/m³)

v = Local velocity (m/s)

c = Blade chord (m)

C_T = Thrust coefficient (dimensionless)

dr = Radial length of the blade element (m)

Calculator

Property to Calculate:

Thrust generated by a blade element (dT):

Air density (ρ):

Local velocity (v):

Blade chord (c):

Thrust coefficient (C_T):

Radial length of the blade element (dr):

Equation Assumptions

The system is in steady state.
The fluid is incompressible.
Airfoil behabiour is ideal.
Airfoil section of blade is thin.
There is no flow seperation.