Prometheus Documentation

Prometheus is an open-source combustion equilibrium solver for Python. It parses thermodynamic data from multiple sources (NASA-7, NASA-9, JANAF, CEA, TERRA, AFCESIC), builds a unified species database, and implements equilibrium solvers targeting H₂/O₂ and general-hydrocarbon combustion validation against NASA CEA / RocketCEA.

User Guide

• Thermodynamic Databases
• Solver Algorithm Comparison
• Propellant Optimizer
• Worked Example: CH₄ / O₂ Combustion
• Frozen Nozzle Expansion — Condensed-Phase Handling

Quick Start

from prometheus_equilibrium.equilibrium import (
    SpeciesDatabase,
    EquilibriumProblem,
    ProblemType,
    GordonMcBrideSolver,
)

db = SpeciesDatabase(
    nasa7_path="prometheus/thermo_data/nasa7.json",
    nasa9_path="prometheus/thermo_data/nasa9.json",
    janaf_path="prometheus/thermo_data/janaf.csv",
)
db.load()

h2 = db["H2_G"]
o2 = db["O2_G"]
products = db.get_species({"H", "O"}, max_atoms=20)

T_react = 298.15
H0 = sum(n * sp.enthalpy(T_react) for sp, n in {h2: 2.0, o2: 1.0}.items())

problem = EquilibriumProblem(
    reactants={h2: 2.0, o2: 1.0},
    products=products,
    problem_type=ProblemType.HP,
    constraint1=H0,
    constraint2=30e5,   # 30 bar
    t_init=3500.0,
)

solution = GordonMcBrideSolver().solve(problem)
print(solution.summary())

Indices and Tables

• Index

• Module Index

• Search Page