Source code for RCAIDE.Library.Attributes.Propellants.Ethane
# RCAIDE/Library/Attributes/Propellants/Ethane.py
#
# Created: Mar 2024, M. Clarke
# ----------------------------------------------------------------------------------------------------------------------
# Imports
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from .Propellant import Propellant
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# Ethanol Propellant Class
# ----------------------------------------------------------------------------------------------------------------------
[docs]
class Ethane(Propellant):
"""
A class representing ethane (C2H6) fuel properties for propulsion applications.
Attributes
----------
tag : str
Identifier for the propellant ('Ethane')
reactant : str
Oxidizer used for combustion ('O2')
density : float
Fuel density in kg/m³ (545.6)
specific_energy : float
Specific energy content in J/kg (5.19e7)
energy_density : float
Energy density in J/m³ (2.83e10)
lower_heating_value : float
Lower heating value in J/kg (4.75e7)
use_high_fidelity_kinetics_model : bool
Flag for using detailed chemical kinetics (False)
fuel_surrogate_chemical_properties : dict
Simplified chemical composition for surrogate model {'C2H6': 1.0}
fuel_chemical_properties : dict
Detailed chemical composition for high-fidelity model
air_chemical_properties : dict
Air composition for combustion calculations {'O2':0.2095, 'N2':0.7809, 'AR':0.0096}
surrogate_species_list : list
Species considered in surrogate model ['CO', 'CO2', 'H2O']
species_list : list
Species considered in detailed model ['CO', 'CO2', 'H2O', 'NO', 'NO2', 'CSOLID']
global_warming_potential_100 : Data
100-year global warming potential for emissions
- CO2 : float
GWP for carbon dioxide (1)
- H2O : float
GWP for water vapor (0.06)
- SO2 : float
GWP for sulfur dioxide (-226)
- NOx : float
GWP for nitrogen oxides (52)
- Soot : float
GWP for particulate matter (1166)
- Contrails : float
GWP for contrail formation (11)
Notes
-----
This class implements properties for ethane fuel, including both simplified and
detailed chemical kinetics options. Properties are specified at standard conditions
(15°C, 1 atm).
**Definitions**
'Lower Heating Value'
Heat of combustion excluding latent heat of water vapor
'Global Warming Potential'
Relative measure of heat trapped in atmosphere compared to CO2
'Surrogate Model'
Simplified chemical kinetics model using pure ethane
**Major Assumptions**
* Properties are for standard temperature and pressure conditions (15C, 1atm)
* Density at -90C, 1 atm
"""
def __defaults__(self):
"""This sets the default values.
Assumptions:
Density at -90C, 1 atm
Source:
"""
self.tag = 'Ethane'
self.reactant = 'O2'
self.density = 545.6 # kg/m^3 (15 C, 1 atm)
self.specific_energy = 5.19e7 # J/kg
self.energy_density = 2.83e10 # J/m^3
self.lower_heating_value = 4.75e7 # J/kg
self.stoichiometric_fuel_air_ratio = 0 # [-] Stoichiometric Fuel to Air ratio
self.heat_of_vaporization = 0 # [J/kg] Heat of vaporization at standard conditions
self.temperature = 0 # [K] Temperature of fuel
self.pressure = 0 # [Pa] Pressure of fuel
self.fuel_surrogate_S1 = {} # [-] Mole fractions of fuel surrogate species
self.kinetic_mechanism = '' # [-] Kinetic mechanism for fuel surrogate species
self.oxidizer = ''
self.global_warming_potential_100.CO2 = 1 # CO2e/kg
self.global_warming_potential_100.H2O = 0.06 # CO2e/kg
self.global_warming_potential_100.SO2 = -226 # CO2e/kg
self.global_warming_potential_100.NOx = 52 # CO2e/kg
self.global_warming_potential_100.Soot = 1166 # CO2e/kg
self.global_warming_potential_100.Contrails = 11 # kg/CO2e/km
