Methodological Guidelines and Experimental Validation of a Zero-Dimensional Hydrogen Combustion Model in Spark-Ignition Engines

This study develops a calibration and validation approach for a zero-dimensional (0-D) combustion model in spark-ignition engines using ANSYS CHEMKIN-Pro 2025R1. The model simulates hydrogen-fueled engine performance under realistic operating conditions, providing a computationally efficient alternative to three-dimensional computational fluid dynamics (CFD) simulations. The model employs the Wiebe function for describing combustion rates and the Woschni correlation for handling heat transfer. A novel Equivalent Overall Heat Transfer (EOHT) concept is introduced to account for combined heat losses through convection, radiation, and cooling systems. Using experimental data from Santiago Molina as a reference, the model was calibrated across excess air ratios (λ) from 1.6 to 2.8. The optimized model demonstrated strong agreement with the experiments for in-cylinder pressure, heat release rate, NOx emissions, IMEP, and combustion duration. Results demonstrate that this 0-D model achieves CFD-comparable accuracy for future hydrogen-ammonia blended fuel combustion modeling with substantially reduced computational costs.