Understanding optimal engine operating strategies for gasoline-fueled HCCI engines using crank-angle resolved exergy analysis

This study couples a crank-angle resolved exergy analysis methodology with a multi-zone chemical kinetic model of a gasoline-fueled HCCI engine to quantify exergy loss mechanisms and understand how the losses change with different HCCI engine operating conditions. The in-cylinder exergy loss mechanisms are identified as losses to combustion, heat loss, unburned species, and physical exergy lost to exhaust gases. These loss mechanisms and their effect on overall operating efficiency are studied over a range of engine intake pressures, equivalence ratios, engine speeds and for different engine sizes.