Impact of ethanol on oxidation of iso-octane at low and intermediate temperatures

Investigation into ethanol effects on combustion and particle number emissions in a spark-ignition to compression-ignition (SICI) engine

“…[25] in which the peak-to-peak pressure oscillation of E30 is only about 40% of alkylates at the same CA50. This result indicates ethanol has a strong ability to reduce low temperature heat release (LTHR) produced by low-S components through fast consumption of OH radical [14,59]. As for Fig.…”

“…A combustion system with CR more than 15.0 and λ > 1.6 has the potential to achieve 750~800 K in cylinder near TDC at normal temperature and pressure [36]. Comparing the thermal state of Curve 1 with Curve 2, the H-extraction route for ethanol has changed from α-H to β-H [59] and the OH radical concentration increases rapidly, indicating an enhanced chemical reactivity of the reaction system. In this situation, ethanol-gasoline J o u r n a l P r e -p r o o f blends can be fully taken advantage of on the reduction of fuel consumption and PN emissions.…”

Review of the Influence of Oxygenated Additives on the Combustion Chemistry of Hydrocarbons

“…Because iso -octane is a major component of primary reference fuel, the effect of ethanol addition on its reactivity under intermediate- and low-temperature conditions is of high interest and has been recently studied with RCM and flow reactor − experiments as well as in an earlier JSR study . As already seen for the other fuel mixtures, IDTs were affected in a way that with increasing content of the more reactive component, the IDTs develop toward the IDTs of the neat reactive component, in particular toward the fast reactivity limit of 100% ethanol .…”

“…The influence of ethanol addition on the low-temperature reactivity of iso -octane was recently investigated at a low equivalence ratio of 0.058 in a pressurized flow reactor (10 bar) at temperatures between 550 and 900 K. − CO was measured by a nondispersive infrared (NDIR) analyzer and used as an indicator of the global reactivity. The CO profile of pure iso -octane showed a characteristic low-temperature oxidation behavior, with active reactions from 625–675 K followed by the negative temperature coefficient (NTC) behavior from 675–800 K. In contrast, ethanol showed negligible reactivity below 850 K. The addition of 20 vol % or more of ethanol completely suppressed the low-temperature reactivity of the studied iso -octane/ethanol mixtures.…”