EFFECTS OF COMBUSTION CHAMBER GEOMETRY IN A DIRECT-INJECTION DIESEL ENGINE (COMPARISON OF RE-ENTRANT AND CONVENTIONAL CHAMBERS).

Yasuhiro Daisho, Takeshi Saito, Nobuyuki Ikeya

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Two conventional combustion chamber types and a re-entrant type of direct-injection diesel engine were compared in order to investigate the effects of heat transfer and in-cylinder flow associated with the combustion chamber geometry on combustion itself, engine performance and exhaust gas emissions. Heat transfer calculation and heat release analyses have shown that the re-entrant chamber tends to reduce ignition lag due to the higher chamber wall temperatures. In-cylinder flow measurements using hot wire anemometry have indicated that the re-entrant chamber generates a higher turbulence level, particularly around the top dead center, causing an increase in the rate of heat release. Thus, the re-entrant chamber can favorably improve both fuel economy and smoke, even though fuel injection timing is retarded to reduce NO//x emission.

Original languageEnglish
Pages (from-to)2768-2773
Number of pages6
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume52
Issue number479
Publication statusPublished - 1986 Jul
Externally publishedYes

ASJC Scopus subject areas

  • Mechanical Engineering

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