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| omogeneous charge compression ignition (HCCI) combustion exhibits phenomena including
self-ignition, two-stage combustion (cool flame and hot flame), and negative temperature coefficient (NTC) behavior.
At the same time, the heat release and pressure rise rate at the first-stage play an important role on the total ignition
delay and burn rate for overall combustion. N-heptane and iso-octane are primary reference fuels (PRF) for octane
rating in internal combustion engines. The oxidation mechanism of fuels has a dominant effect on ignition delay, burn
rate, and engine knock-resistant. Based on this background, this paper investigates the oxidation characteristics at low
temperature range from 450K to 650K for n-heptane and iso-octane at the pressure of 15bar, and equivalence ratio of
0.52 using accelerating rate calorimeter (ARC). The experimental results show that the initial exothermic reaction can
be detected at 180 0C for pure primary reference fuels; the pressure increases |
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| Keywords:Primary preference fuel (PRF); Accelerating rate calorimeter (ARC);n-Heptane; iso-Octane Thermal inertia factor; Chemical kinetics |
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