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

Research output: Contribution to journalArticle

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
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

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