J0801-1-5 天然ガスPCCI機関における燃焼室形状が未燃物質に与える影響(次世代燃料と新しい燃焼技術,エンジン,動カシステム(1))

概要

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To reveal the source of unburned species emissions in a natural-gas-fueled PCCI engine, experimental investigations were performed using a single-cylinder test engine. CO and THC concentrations were measured at three levels of intake charge temperatures varying the piston bowl diameter, piston top clearance and piston top land crevice volume. The results showed that the variations of chamber geometry affect the combustion characteristics, CO and HC emissions, and that the effects of piston bowl diameter and piston top clearance on the tendency of THC and CO depend on fuel quantity and intake air temperature. Furthermore, fuel-air mixture in top land crevice volume causes HC emission ; however, does not contribute markedly to CO emission.
2009-09-12