Experimental and 0D engine modeling of methane–hydrogen combustion in a CHP system incorporating kinetic reduction

This study presents an engine-oriented workflow for methane–hydrogen combustion, combining experiments, kinetic modeling, and zero-dimensional (0D) simulations for CHP applications. In-cylinder pressure and CO 2 concentration data were measured in a single-cylinder SenerTec DACHS engine fueled with natural gas (∼92% methane) and blends with up to 25% hydrogen at 2450 rpm under low load. A regime-aware kinetic reduction approach was developed and validated to ensure accuracy across autoignition and flame-propagation regimes, while maintaining thermodynamic consistency in the 0D model. Combustion was modeled using a Wiebe function and Woschni heat transfer correlation over −114° to +100°CA. Simulated pressure traces agreed well with experiments, with peak pressure deviations below 3%. Hydrogen addition advanced combustion, shifting 10% and 50% mass fraction burned by up to 2° and 3°CA, and increased peak heat release rates. The workflow effectively captures combustion trends under hydrogen enrichment in CHP engines.