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Investigation and Analysis of RCCI using NVO on a Converted Spark Ignition Engine
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- Author / Creator
- Klikach, Robert
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Dual-fuel Reactivity Controlled Compression Ignition (RCCI) combustion is investigated as an efficient combustion mode on a modified 4-cylinder production Gasoline Direct Injection (GDI) engine. RCCI uses Low-Temperature Combustion (LTC) to provide high efficiency combustion while avoiding NOx and soot formation. High-reactivity liquid n-heptane is direct injected during compression while compressed natural gas is port injected during the intake stroke. The use of Negative Valve Overlap (NVO) with RCCI is investigated to recirculate exhaust gases to the next cycle. Two injection strategies for the n-heptane were investigated, a single pilot injection and a split injection strategy with a pilot injection and an injection in the NVO.
The sensitivity of the combustion timing and load to NVO duration, intake air temperature, fueling rates and n-heptane pilot injection timing were investigated. A feedback control scheme is proposed from these sensitivities. The single and split injection RCCI strategies both improve the engine’s thermal and combustion efficiency and reduced NOx emissions compared to the engine running in SI mode with natural gas. The split injection strategy has longer burn duration, lower peak pressure rise rates, improved efficiency and reduced unburnt methane and carbon monoxide over then single injection case.
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- Subjects / Keywords
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- Graduation date
- Fall 2018
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.