TY - JOUR
T1 - Effects of piston bowl geometry on combustion and emissions characteristics of a natural gas/diesel RCCI engine
AU - Kakaee, Amir-Hasan
AU - Nasiri-Toosi, Ali
AU - Partovi, Babak
AU - Paykani, Amin
PY - 2016/8/8
Y1 - 2016/8/8
N2 - 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.
AB - 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.
U2 - 10.1016/j.applthermaleng.2016.03.162
DO - 10.1016/j.applthermaleng.2016.03.162
M3 - Article
SN - 1359-4311
VL - 102
SP - 1462
EP - 1472
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
ER -