University of Hertfordshire

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Original languageEnglish
Number of pages11
Pages (from-to)1462-1472
JournalApplied Thermal Engineering
Journal publication date8 Aug 2016
Publication statusPublished - 8 Aug 2016


Piston bowl geometries are crucial to the combustion and emission characteristics of reactivity controlledcompression ignition (RCCI) engines. The present numerical study explores the effects of piston bowlgeometry on natural gas/diesel RCCI performance and emissions at medium engine load. Three differentpiston bowl geometries including stock, bathtub and cylindrical with constant compression ratio 16.1:1are selected using double injection strategy and influences of engine speed, piston bowl depth andchamfered ring-land are investigated. It is found that the bowl profile does not affect combustion ofRCCI engine at low engine speeds, but it has much considerable effect at higher engine speeds. The resultsobtained also show that bathtub design yields the best performance and emissions at higher speeds. It isalso reported that both piston bowl depth and chamfered ring-land can also affect engine-out emissionsspecially UHC and CO emissions.

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