Abstract:
This study presents the parametric investigation of syngas fuelled homogeneous charge
compression ignition (HCCI) engine. The chemical kinetic simulation of the syngas HCCI
engine is performed using the stochastic reactor model (SRM). This study first compares
and evaluates the performance of different reaction mechanisms for the HCCI engine. The
experimental combustion pressure data is compared with numerically investigated combustion pressure to validate the reaction mechanisms. Results indicate that a numerically
simulated combustion pressure using a detailed reaction mechanism consisting of 173
reactions and 32 species (CRECK-2014) is well-matched with the profile of experimental
combustion pressure. The validated reaction mechanism is further used to investigate the
HCCI engine at different engine speeds for various equivalence ratio ðfÞ, syngas composition (hydrogen addition (H2:CO)) and inlet valve closing temperature ðTivcÞ. The sensitivity
analysis is performed to find the prominent reactions in the oxidation reaction mechanism. Based on the combustion characteristics, syngas HCCI maps are developed. The
effect of engine operating conditions on combustion and emission characteristics is also
investigated. Furthermore, the result of engine operating parameters on converting fuel
energy into physical exergy, chemical exergy, work exergy, and heat loss exergy is also
briefly discussed.
