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Atomization and Sprays
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ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v7.i1.20
pages 33-42

ANALYSIS OF HIGH-PRESSURE DIESEL SPRAY FORMATION IN THE EARLY STAGE OF INJECTION

Hideo Takahashi
Department of Mechanical Engineering, Gunma College of Technology, Gunma, Japan
Hiroki Yanagisawa
Mitsubishi Motor Corporation
Siichi Shiga
Department of Mechanical Engineering, Faculty of Engineering, Gunma University, Gunma, Japan
Takao Karasawa
Department of Mechanical Engineering, Faculty of Engineering, Gunma University, Gunma, Japan
Hisao Nakamura
Department of Mechanical Engineering, Faculty of Engineering, Gunma University, Gunma, Japan

RÉSUMÉ

The characteristics of a high-pressure diesel spray in the early stage of injection are examined by use of enlarged shadowgraphy, under both atmospheric and pressurized conditions. To clarify the mechanisms of the initial stage development, two kinds of injection pressure history and a wide range of valve opening pressures are covered. Until 0.3 ms after the start of injection, there is a region at which the tip penetration is insensitive to the ambient pressure, which becomes shorter with an increase in the valve opening pressure. This characteristic feature of the spray formation process is related to the eddy motion generated in the spray.