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Title
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Assessment of the impacts of
combustion chamber bowl geometry
and injection timing on a reactivity
controlled compression ignition engine
at low and high load conditions
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Type
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Article
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Keywords
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High-speed diesel engine, RCCI combustion, combustion chamber, injection timing, emissions, fuel consumption
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Abstract
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The present paper aims to assess the impacts of diesel injection timing and two bowl geometries including re-entrant and
wide-shallow combustion chambers on the combustion characteristics, emissions formation, and fuel consumption in a reactivity
controlled compression ignition diesel engine under low and high load (five and nine bar indicating mean effective pressure)
conditions. The results revealed that diesel injection at –60 CA ATDC under low load conditions significantly
decreased soot and NOx emissions simultaneously for both piston bowl geometries. The use of the wide-shallow chamber
decreased the period of the ignition delay and increased the engine operable load range as a result of more stable combustion
under high-load conditions compared to the re-entrant chamber. Moreover, at all diesel injection timings, the indicated
specific fuel consumption was decreased by nearly 4.8 and 6.6% under low and high load conditions, respectively when the
wide-shallow combustion chamber was used since the heat transfer loss was lower than that of the re-entrant chamber.
However, NOx emission under high load conditions at the center of the combustion chamber and more soot emission in
the exhaust gas are two disadvantages of the wide-shallow chamber versus the re-entrant combustion chamber.
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Researchers
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bahram jafari (First researcher) , mahdi seddiq (Second researcher) , Seyyed Mostafa Mirsalim (Third researcher)
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