TY - JOUR
T1 - A Study on Diesel Combustion with High-Pressure Fuel Injection (Improvement of Combustion and Exhaust Emissions Using Small-Hole-Diameter Nozzles)
AU - Nakakita, Kiyomi
AU - Kondoh, Teruaki
AU - Watanabe, Satoshi
PY - 1994
Y1 - 1994
N2 - The effects of nozzle hole diameter on combustion and exhaust emissions were investigated using a single-cylinder DI diesel engine. ( 1 ) Exhaust NOx and combustion period depend only on injection pressure and not on nozzle hole diameter, because with a small-hole- dia. nozzle the effect of reduced mean injection rate is canceled out by the effect of promoted mixture formation and combustion. (2) With decreasing injection pressure, smoke sharply increases with a large hole-dia. nozzle but does not increase with small hole diameter of less than 0.20 mm. The decrease of injection pressure reduces NOx emission. ( 3 ) The effect of suppressing the increase of smoke with a small hole-dia. nozzle is considered to be caused mainly by the rapid temperature rise over about 1 800°C in the fuel- rich region near the spray in flame. ( 4 ) With the conversion of a deep bowl combustion chamber to a shallow-dish one, smoke increases as injection pressure decreases, in spite of the use of a small-hole-dia. nozzle, due to the reduction of mixing effect.
AB - The effects of nozzle hole diameter on combustion and exhaust emissions were investigated using a single-cylinder DI diesel engine. ( 1 ) Exhaust NOx and combustion period depend only on injection pressure and not on nozzle hole diameter, because with a small-hole- dia. nozzle the effect of reduced mean injection rate is canceled out by the effect of promoted mixture formation and combustion. (2) With decreasing injection pressure, smoke sharply increases with a large hole-dia. nozzle but does not increase with small hole diameter of less than 0.20 mm. The decrease of injection pressure reduces NOx emission. ( 3 ) The effect of suppressing the increase of smoke with a small hole-dia. nozzle is considered to be caused mainly by the rapid temperature rise over about 1 800°C in the fuel- rich region near the spray in flame. ( 4 ) With the conversion of a deep bowl combustion chamber to a shallow-dish one, smoke increases as injection pressure decreases, in spite of the use of a small-hole-dia. nozzle, due to the reduction of mixing effect.
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U2 - 10.1299/kikaib.60.3198
DO - 10.1299/kikaib.60.3198
M3 - Article
AN - SCOPUS:0028515185
SN - 0387-5016
VL - 60
SP - 3198
EP - 3206
JO - Transactions of the Japan Society of Mechanical Engineers Series B
JF - Transactions of the Japan Society of Mechanical Engineers Series B
IS - 577
ER -