RCAIDE.Library.Methods.Powertrain.Converters.Ducted_Fan.Performance.Rankine_Froude_Momentum_Theory.RFMT_performance

RFMT_performance

RFMT_performance(ducted_fan, conditions)

Computes ducted fan performance characteristics using Rankine-Froude Momentum Theory.

Parameters:

• propulsor (Converter) – Ducted fan propulsor component containing the ducted fan

• state (Conditions) – Mission segment state conditions

Returns:

Updates state.conditions.energy.converters[ducted_fan.tag] with computed performance data:

• thrustarray(N,3)

  Thrust vector [N]

• powerarray(N,1)

  Power required [W]

• torquearray(N,1)

  Shaft torque [N-m]

• momentarray(N,3)

  Moment vector [N-m]

• efficiencyarray(N,1)

  Propulsive efficiency [-]

• tip_macharray(N,1)

  Blade tip Mach number [-]

• thrust_coefficientarray(N,1)

  Non-dimensional thrust coefficient [-]

• power_coefficientarray(N,1)

  Non-dimensional power coefficient [-]

• figure_of_meritarray(N,1)

  Hovering figure of merit [-] (BEMT only)

Return type:

None

Notes

Major Assumptions

• Steady state operation

• Incompressible flow for Rankine-Froude theory

• Rigid blades

• No blade-wake interaction

• No ground effect

See also

RCAIDE.Library.Components.Powertrain.Converters.Ducted_Fan, RCAIDE.Library.Methods.Powertrain.Converters.Ducted_Fan.design_ducted_fan

compute_ducted_fan_efficiency(ducted_fan, V, omega)

Calculate propeller efficiency based on propeller type and velocity.

Parameters:

• propeller_type (str) – Type of propeller (‘constant_speed’ or ‘fixed_pitch’)

• u0 (float) – Current velocity

Returns:

Calculated propeller efficiency

Return type:

float