**A MATLAB-GUI based open-source tool for solving gaseous combustion problems**

# Combustion Toolbox in action#

# Combustion Toolbox capabilities#

# Start here!#

# Gallery#

We have several examples of what Combustion Toolbox can do. Here we show some results obtained from Combustion Toolbox.

**Figure 1:** *Performance test, 100 Chapman-Jouguet pre-detonation and post-detonation states for a lean to rich CH4-air mixtures at standard conditions $(T1 = 300$ K and pressure $p1 = 1$ bar$)$. The computational time was of 2.86 seconds using a Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz for a set of 24 species considered.*

**Figure 2:** *Variation of the molar fractions $X_j$ for a TP transformation of a Silica-Phenolic mixture at atmospheric pressure $(p = 1$ atm$)$ with $T \in [200, 5000]$; line: numerical results obtained with CT; symbols: numerical results obtained with NASA’s CEA.*.

**Figure 3:** *Hugoniot curves for different molecular gases at pre-shock temperature $T_1 = 300$ K and pressure $p_{1} = 1$ atm [numerical results obtained with Combustion Toolbox (lines) and contrasted with NASA’s Chemical Equilibrium with Applications (CEA) code excluding ionization (symbols)]*.

**Figure 4:** *Variation of molar fraction for a CJ detonation for lean to rich CH4-air mixtures at standard conditions $(T_1 = 300$ K and pressure $p_1 = 1$ atm$)$; line: numerical results obtained with Combustion Toolbox; circles: NASA’s Chemical Equilibrium with Applications code. The computational time was of 6.68 seconds using a Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz for a set of 26 species considered and a total of 351 case studies.*

**Figure 5:** *Pressure-deflection (a) and wave angle-deflection (b) shock polar diagrams for air (79% N2, 21% O2) at pre-shock temperature $T_1 = 300$ K and pressure $p_1 = 1$ atm, and a range of pre-shock Mach numbers M1 between 2 and 14; line: calorically imperfect gas with ionization/dissociation; dashed: calorically imperfect gas with frozen chemistry; circles: results obtained with Cantera within Caltech’s SD-Toolbox; diamonds: maximum deflection angle* \(\theta_{\rm max}\).

# Contributing#

Please send feedback or inquiries to acuadra@ing.uc3m.es

Thank you for testing Combustion Toolbox!

# Acknowledgements#

Combustion Toolbox’s color palette is obtained from the following repository: Stephen (2021). ColorBrewer: Attractive and Distinctive Colormaps (https://github.com/DrosteEffect/BrewerMap), GitHub. Retrieved December 3, 2021.

For validations, Combustion Toolbox uses CPU Info from the following repository: Ben Tordoff (2022). CPU Info (https://github.com/BJTor/CPUInfo/releases/tag/v1.3), GitHub. Retrieved March 22, 2022.

Combustion Toolbox’s splash screen is based on a routine from the following repository: Ben Tordoff (2022). SplashScreen (https://www.mathworks.com/matlabcentral/fileexchange/30508-splashscreen), MATLAB Central File Exchange. Retrieved October 15, 2022.

Combustion Toolbox’s periodic table layout is based in the following repository: Bruno Salcedo (2018). latex-periodic-table (https://github.com/brunosalcedo/latex-periodic-table), Github. Retrieved October 15, 2022.

# People#

**Alberto Cuadra-Lara**-*Lead developer***César Huete**-*Advisor***Marcos Vera**-*Advisor*

Grupo de Mecánica de Fluidos, Universidad Carlos III, Av. Universidad 30, 28911, Leganés, Spain

See also the list of contributors who participated in this project.

# Citing Combustion Toolbox#

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

*Cuadra, A., Huete, C., & Vera, M. (2023). Combustion Toolbox: A MATLAB-GUI based open-source tool for solving gaseous combustion problems. (v0.9.99g). Zenodo. https://doi.org/10.5281/zenodo.5554911.*

It can be handy the BibTeX format:

```
@misc{combustiontoolbox,
author = "Cuadra, A and Huete, C and Vera, M",
title = "Combustion Toolbox: A MATLAB-GUI based open-source tool for solving gaseous combustion problems",
year = 2023,
note = "Version 0.9.99g",
doi = {https://doi.org/10.5281/zenodo.5554911}
}
```