Journal
ENERGY
Volume 88, Issue -, Pages 584-594Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2015.05.083
Keywords
Gasoline; Ethanol; n-heptane; RCCI (reactivity controlled compression ignition); Combustion; Emissions
Categories
Funding
- National Natural Science Foundation of China [51176116]
- National Basic Research Program of China [2013CB228405]
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This paper presents an experimental study on the combustion and emissions characteristics of RCCI (reactivity controlled compression ignition) combustion in which in-cylinder direct injection of n-heptane combined with port injection of ethanol and gasoline, respectively, are used with a single-cylinder engine. Results show that, when the system is fueled with ethanol/n-heptane at a specific overall lower heating value per-cycle, the ignition delay of RCCI combustion increases greatly but the in-cylinder temperature and pressure drop severely for a larger premixed ratio. NOx and soot emissions are significantly improved for RCCI combustion under conditions of increased premixed ratio. At different premixed ratios, the HC (hydrocarbon) emission of gasoline/n-heptane is lower than that of ethanol/n-heptane, but the NOx and soot emissions are higher than those obtained with ethanol/n-heptane. When the premixed ratio is approximately 0.57, the indicated thermal efficiencies of both gasoline/n-heptane and ethanol/n-heptane reach their maximum values. When fueled with ethanol/n-heptane along with the increase in engine load, CO, NOx and soot emissions are lower than fueled with gasoline/n-heptane, but the HC emissions are higher. When IMEP (indicated mean effective pressure) is higher than 6 bar, the indicated thermal efficiency of ethanol/n-heptane is higher than that of gasoline/n-heptane. Ethanol is a good candidate to replace gasoline as port injected fuel in RCCI mode at heavy loads. (C) 2015 Elsevier Ltd. All rights reserved.
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