Use this aerodynamics calculator to calculate the actuator disk efficiency for your aerodynamics problems.
Formula:
η = 1 / ( 1 + ( Va1 / V0))
where,Va1 - Velocity Va1 in (m/s)
V0 - Velocity V0 in (m/s)
Actuator Disk Efficiency Calculator
Va1 - Velocity Va1 in (m/s)
V0 - Velocity V0 in (m/s)