Combustion Toolbox: A MATLAB-GUI based open-source tool for solving gaseous combustion problems

The Combustion Toolbox is a MATLAB-based thermochemical framework designed to solve problems involving chemical equilibrium for both gas- and condensed-phase species. The toolbox is composed of several modules, each of which is designed to solve a specific class of problems:

• CT-EQUIL computes the thermochemical equilibrium composition of multi-component gas mixtures for prescribed set of chemical species (gaseous—including ions—or condensed phases) and thermodynamic constraints (e.g. pressure-enthalpy).
• CT-SD solves steady-state shock and detonation wave problems for both normal and oblique incidence.
• CT-ROCKET estimates the theoretical performance of rocket engines under highly idealized conditions.
• CT-LIA predicts shock-turbulence interaction statistics using linear theory, accounting for thermochemical effects.
• CT-TURBULENCE performs spectral and statistical analysis of turbulent flows, including energy spectra, Helmholtz decomposition, and turbulence diagnostics.

The framework also includes an intuitive graphical user interface (GUI), with a royalty-free standalone version available for Windows, macOS, and Linux.

Citing Combustion Toolbox

If you use the Combustion Toolbox in a publication, please cite it using the following references:

• Cuadra, A., Huete, C., & Vera, M. (2026). Combustion Toolbox: An open-source thermochemical code for gas-and condensed-phase problems involving chemical equilibrium. Computer Physics Communications 320, 110004. doi:10.1016/j.cpc.2025.110004.
• Cuadra, A., Huete, C., & Vera, M. (2026). Combustion Toolbox: A MATLAB-GUI based open-source tool for solving gaseous combustion problems. Version 1.2.9. Zenodo. doi:10.5281/zenodo.5554911.

It can be handy the BibTeX format:

@article{cuadra2026a,
    title   = {{Combustion Toolbox: An open-source thermochemical code for gas- and condensed-phase problems involving chemical equilibrium}},
    author  = {A. Cuadra and C. Huete and M. Vera},
    journal = {Computer Physics Communications},
    volume  = {320},
    pages   = {110004},
    year    = {2026},
    issn    = {0010-4655},
    doi     = {https://doi.org/10.1016/j.cpc.2025.110004},
}

@misc{combustiontoolbox,
    title   = "{{Combustion Toolbox: A MATLAB-GUI based open-source tool for solving gaseous combustion problems}}",
    author  = {A. Cuadra and C. Huete and M. Vera},
    year    = {2026},
    note    = {Version 1.2.9},
    doi     = {https://doi.org/10.5281/zenodo.5554911}
}