Exploring H ₂ /O ₂ Injection in an Active Pre-Chamber Ignition Engine

• DOI: 10.4271/03-18-02-0013
• Publication Date: 2025-03-11T02:15:37Z
• Authors: Tianxiao Yu; Dong Eun Lee; Afaque Alam; Jay P. Gore; Li Qiao

<div>Active fuel injection into a pre-chamber (PC) promotes high-temperature and highly turbulent jets, which ignite the cylinder gas with very high exhaust recirculation (EGR) ratio, reducing emissions such as NO<sub>x</sub>. In present study, two active PC strategies were designed to investigate effect of injected hydrogen mass mixture air-to-fuel equivalence ratio <i>λ</i> on combustion, jet formation, main chamber (MC) combustion. Stoichiometric or rich hydrogen/oxygen mixtures are actively enhance combustion processes in MC. A three-dimensional numerical engine model is developed using commercial CFD code CONVERGE. The geometry parameters adopt modified GM 4-cylinder 2.0 L GDI gasoline engine. local developments temperature velocity resolved adaptive mesh refinement (AMR). turbulence flow computed <i>k</i>-epsilon Reynolds-averaged Navier–Stokes (RANS) equations. process modeled extended coherent flamelet (ECFM). obtained results, include MC pressures heat release rates, align well experimental data. Detailed analysis performed study properties turbulence–chemistry interactions. results reveal that injecting stoichiometric oxygen leads an EGR limit 36%, attributed laminar flame speed adiabatic mixture, making it effective method for engine’s NO<sub>x</sub> emissions.</div>