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Injection Effects in Low Load RCCI Dual-Fuel Combustion
Technical Paper
2011-24-0047
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Dual-fuel reactivity controlled compression ignition (RCCI) engine experiments were conducted with port fuel injection of isooctane and direct injection of n-heptane. The experiments were conducted at a nominal load of 4.75 bar IMEPg, with low isooctane equivalence ratios. Two sets of experiments explored the effects of direct injection timing with single and double injections, and multi-dimensional CFD modeling was used to explore mixture preparation and timing effects. The findings were that if fuel-liner impingement is to be avoided, double injections provide a 40% reduction in CO and HC emissions, resulting in a 1% increase in thermal efficiency. The second engine experiment showed that there is a linear relationship between reactivity (PRF number) and intake temperature. It was also found that if the premixed fuel fraction is above a certain limit, the high-temperature heat release (HTHR) can be manipulated by changing the global PRF number of the in-cylinder fuel blend.
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Citation
Splitter, D., Hanson, R., Kokjohn, S., Wissink, M. et al., "Injection Effects in Low Load RCCI Dual-Fuel Combustion," SAE Technical Paper 2011-24-0047, 2011, https://doi.org/10.4271/2011-24-0047.Also In
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