Source code for RCAIDE.Library.Attributes.Propellants.Liquid_Natural_Gas
# RCAIDE/Library/Attributes/Propellants/Liquid_Natural_Gas.py
#
#
# Created: Mar 2024, M. Clarke
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# Imports
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from .Propellant import Propellant
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# Gaseous_Hydrogen Class
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[docs]
class Liquid_Natural_Gas(Propellant):
"""
A class representing Liquid Natural Gas (LNG) fuel properties and composition
for propulsion applications.
Attributes
----------
tag : str
Identifier for the propellant ('Liquid_Natural_Gas')
reactant : str
Oxidizer used for combustion ('O2')
density : float
Fuel density in kg/m³ (414.2)
specific_energy : float
Specific energy content in J/kg (53.6e6)
energy_density : float
Energy density in J/m³ (22200.0e6)
use_high_fidelity_kinetics_model : bool
Flag for using detailed chemical kinetics (False)
fuel_surrogate_chemical_properties : dict
Simplified chemical composition for surrogate model
- CH4 : float
Methane fraction (0.85)
- C2H6 : float
Ethane fraction (0.1)
- C3H8 : float
Propane fraction (0.05)
fuel_chemical_properties : dict
Detailed chemical composition
- CH4 : float
Methane fraction (0.83)
- C2H6 : float
Ethane fraction (0.1)
- C3H8 : float
Propane fraction (0.05)
- C4H10 : float
Butane fraction (0.02)
global_warming_potential_100 : Data
100-year global warming potentials
- CO2 : float
Carbon dioxide (1)
- H2O : float
Water vapor (0.06)
- SO2 : float
Sulfur dioxide (-226)
- NOx : float
Nitrogen oxides (52)
- Soot : float
Particulate matter (1166)
- Contrails : float
Contrail formation (11)
Notes
-----
LNG is a cryogenic fuel consisting primarily of methane with small amounts of
heavier hydrocarbons. It requires storage at approximately -162°C but offers
reduced carbon emissions compared to conventional fuels.
**Definitions**
'Surrogate Model'
Simplified three-component representation for faster calculations
'Global Warming Potential'
Relative measure of heat trapped in atmosphere compared to CO2
'Energy Density'
Energy content per unit volume, affected by cryogenic storage conditions
**Major Assumptions**
* Properties are for saturated liquid at atmospheric pressure
* Composition represents typical LNG mixture
"""
def __defaults__(self):
"""This sets the default values.
Assumptions:
None
Source:
None
"""
self.tag = 'Liquid_Natural_Gas'
self.reactant = 'O2'
self.density = 414.2 # kg/m^3
self.specific_energy = 53.6e6 # J/kg
self.energy_density = 22200.0e6 # J/m^3
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
