Technical Paper
Exploration of Heat Release in a Homogeneous Charge Compression Ignition Engine with Primary Reference Fuels
2013-10-14
2013-01-2622
This study utilizes homogeneous charge compression ignition (HCCI) engine experiments to characterize fuel effects on Low Temperature Heat Release (LTHR) and Intermediate Temperature Heat Release (ITHR) of different primary reference fuel (PRF) mixtures. Experiments varied intake pressure from naturally aspirated to 1.8 bar boosted conditions, equivalence ratio from ϕ=0.3 to 0.4, and a variety of different fuel mixtures (PRF 85 to PRF 100). The engine experiments were used to guide single-zone HCCI simulations, using detailed chemical kinetic mechanisms comprising PRF mixtures. The experiments revealed important trends related to pre-ignition reactions in blends of iso-octane and n-heptane. As previous research has found, the pre-ignition reactions seen in these mixtures have a high sensitivity to pressure.
