Journal
FUEL
Volume 162, Issue -, Pages 239-250Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2015.09.022
Keywords
RCCI; n-Heptane; Ethanol; n-Butanol; n-Amyl alcohol; Combustion and emissions
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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 combustion and emissions characteristics of reactivity controlled compression ignition (RCCI) combustion in which in-cylinder directly injected n-heptane combined with port injection (PI) of ethanol, n-butanol and n-amyl alcohol are used in a single-cylinder engine. The results show that when the overall lower heating values (LHVs) per-cycle is constant, with the increase of premixed ratio (RP), nitrogen oxides (NOx) and soot emissions decrease. When in high overall LHVs per-cycle, NOx and soot emissions of ethanol, n-butanol and n-amyl alcohol RCCI are also high. Meanwhile, compared to n-heptane/n-butanol and n-heptane/n-amyl alcohol, the combustion phases of ethanol RCCI are strongly delayed at high premixed ratio. For certain premixed ratios and overall LHVs per-cycle, low NOx and soot emissions can be realized when fueled with ethanol. (C) 2015 Elsevier Ltd. All rights reserved.
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