Source code for RCAIDE.Library.Components.Powertrain.Converters.Fan
# RCAIDE/Library/Components/Propulsors/Converters/Fan.py
# (c) Copyright 2023 Aerospace Research Community LLC
#
# Created: Feb 2024, M. Clarke
# ----------------------------------------------------------------------------------------------------------------------
# IMPORT
# ----------------------------------------------------------------------------------------------------------------------
# RCAIDE imports
from .Converter import Converter
from RCAIDE.Framework.Core import Data,Units
from RCAIDE.Library.Methods.Powertrain.Converters.Fan.append_fan_conditions import append_fan_conditions
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# Fan
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[docs]
class Fan(Converter):
"""
A fan component model for turbofan and ducted fan propulsion systems.
Attributes
----------
tag : str
Identifier for the fan component. Default is 'Fan'.
polytropic_efficiency : float
Efficiency of the compression process accounting for losses. Default is 1.0.
pressure_ratio : float
Ratio of outlet to inlet total pressure. Default is 1.0.
angular_velocity : float
Rotational speed of the fan [rad/s]. Default is 0.0.
Notes
-----
The Fan class models the compression and energy addition process in a fan stage.
The model:
* Calculates work input required for given pressure ratio
* Accounts for losses through polytropic efficiency
* Handles variable speed operation
* Assumes axial flow conditions
* Models both subsonic and transonic fan operation
**Major Assumptions**
* Pressure ratio and efficiency do not change with varying conditions
* Uniform flow at inlet and exit
* No radial variations in flow properties
* Adiabatic process (no heat transfer with surroundings)
* Steady flow conditions
**Definitions**
'Polytropic Efficiency'
Measure of compression efficiency accounting for real gas effects
'Pressure Ratio'
Ratio of exit to inlet total pressure
'Angular Velocity'
Rotational speed of the fan rotor
References
----------
[1] Mattingly, J. D., & Boyer, K. M. (2016). Elements of propulsion: Gas
turbines and rockets, second edition Jack D. Mattingly, Keith M. Boyer.
American Institute of Aeronautics and Astronautics.
See Also
--------
RCAIDE.Library.Components.Component
RCAIDE.Library.Methods.Powertrain.Converters.Fan.append_fan_conditions
"""
def __defaults__(self):
"""This sets the default values for the component to function.
Assumptions:
Pressure ratio and efficiency do not change with varying conditions.
Source:
https://web.stanford.edu/~cantwell/AA283_Course_Material/AA283_Course_Notes/
"""
#set the default values
self.tag = 'Fan'
self.polytropic_efficiency = 1.0
self.mechanical_efficiency = 1.0
self.pressure_ratio = 1.0
self.design_angular_velocity = 3000 * Units.rpm
[docs]
def append_operating_conditions(self,segment,energy_conditions,noise_conditions=None):
append_fan_conditions(self,segment,energy_conditions)
return
