Analysis of combustion concepts in a newly designed two-stroke high-speed direct injection compression ignition engine
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Type
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Journal
Article
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Author
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Jesús
Benajes
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Author
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Ricardo
Novella
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URL
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Volume
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16
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Issue
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1
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Pages
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52-67
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Publication
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International
Journal of Engine Research
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Date
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2015-01-01
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Abstract
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Two
research paths are being followed to develop compression ignition engines,
namely, the extreme optimization of the conventional diesel combustion
concept and the development of alternative combustion concepts. The
optimization of the conventional diesel combustion concept focuses on
controlling the combustion development in an attempt to improve pollutant
emissions and efficiency. Research in four-stroke engines has shown the
benefits of the partially premixed combustion concept in terms of emissions
and efficiency when using high volatility and low reactivity fuels, such as
gasoline-like fuels, from medium-to-high engine loads.
Researchers conducted a detailed optimization of the conventional diesel combustion concept in a novel two-stroke poppet valves high speed direct injection compression ignition engine, in order to find the real limits of this engine configuration. Its compatibility with the partially premixed combustion concept using a high octane fuel with a triple injection strategy for reducing pollutant emissions at medium-to-low load conditions was evaluated considering the impact on engine efficiency. Results confirmed the potential for attaining state-of-the-art emission levels operating with diesel combustion, and how emissions and efficiency can be optimized by adjusting the air management settings without facing any additional trade-off aside from that usual between NOX and soot. |
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