Combustion Characteristics of Premixed Hydrogen Fueled Spark Ignition Engine 2021-26-0224

The present work is focused on getting insight into premixed hydrogen fueled spark ignition engine using numerical simulations. Combustion simulations with reduced kinetics have been validated with experiments and the validated model has been used for a parametric study. A clear transition in combustion characteristics has been observed at a threshold of 0.6 equivalence ratio. Flame propagation speed has been estimated by image processing OH mass fraction contours from simulations. This has been compared to laminar flame speed obtained from 1D tools to understand the transition of flame towards turbulent. NO formation has been observed to increase till an equivalence ratio of 0.8 due to an increase in flame temperature and decrease with further increase in equivalence ratio due to late cycle dissociation. The findings reported in this study shall be helpful in optimizing combustion systems for hydrogen fueled spark ignition engines to overcome flame extinction and reduce NO emissions.