A Study on Diesel Combustion with High-Pressure Fuel Injection (Improvement of Combustion and Exhaust Emissions Using Small-Hole-Diameter Nozzles)

Kiyomi Nakakita, Teruaki Kondoh, Satoshi Watanabe

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13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3198-3206
Number of pages9
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume60
Issue number577
DOIs
Publication statusPublished - Jan 1 1994

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exhaust emission
fuel injection
Fuel injection
nozzles
Nozzles
injection
Smoke
smoke
Engine cylinders
Combustion chambers
diesel engines
parabolic reflectors
combustion chambers
Diesel engines
sprayers
flames

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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title = "A Study on Diesel Combustion with High-Pressure Fuel Injection (Improvement of Combustion and Exhaust Emissions Using Small-Hole-Diameter Nozzles)",
abstract = "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.",
author = "Kiyomi Nakakita and Teruaki Kondoh and Satoshi Watanabe",
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AU - Nakakita, Kiyomi

AU - Kondoh, Teruaki

AU - Watanabe, Satoshi

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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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