Two-stage ignition in HCCI combustion and HCCI control by fuels and additives

摘要: A Rapid Compression Machine (RCM) has been used to study the effects of fuel structure and additives on Homogeneous Charge Ignition (HCCI) pure hydrocarbon fuels mixtures under well-determined conditions. Such information is needed for understanding ignition delays burning rates in HCCI engines, “knock” spark-ignition engines. It also valuable validating basic chemical kinetic models oxidation. The include: paraffins (n-heptane, iso-octane), cyclic (cyclohexane, methylcyclohexane), olefins (1-heptene, 2-heptene, 3-heptene), (cyclohexene, 1,3-cyclohexadiene), an aromatic (toluene). were 2-ethyl-hexyl-nitrate di-tertiary-butyl-peroxide. was found that which contained -CH2-CH2-CH2- showed two-stage with relatively short delay depended strongly energy released during first-stage. For primary reference (n-heptane + only molar ratio n-heptane oxygen independent octane number (percent iso-octane). On other hand, burn rate both these parameters, uniquely determine equivalence ratio. When included air/fuel mixtures, reduced but not affected. These results indicate combustion, can be independently controlled using various additives.