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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2018026468
pages 735-749

FLOW FIELDS AND TURBULENT CHARACTERISTICS IN NON-EVAPORATING DIESEL SPRAYS

Yoshimitsu Kobashi
Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan
Kazuhiro Yokogawa
Kanazawa Institute of Technology, 7-1, Ohgigaoka, Nonoichi, Ishikawa, 921-8501, Japan
Hiro Miyabe
Kanazawa Institute of Technology, 7-1, Ohgigaoka, Nonoichi, Ishikawa, 921-8501, Japan
Ryosuke Hase
Kanazawa Institute of Technology, 7-1, Ohgigaoka, Nonoichi, Ishikawa, 921-8501, Japan
Satoshi Kato
Kanazawa Institute of Technology, 7-1, Ohgigaoka, Nonoichi, Ishikawa, 921-8501, Japan

ABSTRAKT

A particle image velocimetry (PIV) technique with a combination of high-speed video camera and continuous wave (CW) green laser light has been applied to non-evaporating diesel sprays injected from single-hole nozzles in a quiescent constant volume vessel. The velocity fields and the turbulent properties have been investigated to gain more insight into the turbulent mixing processes. The present study particularly focuses on the impacts of injection pressure and ambient density which are the principal combustion control parameters in modern diesel engines. The experimental and analytical results show that the distribution of the normalized turbulence intensity of diesel sprays is unchanging regardless of the fuel injection conditions and is identical with the turbulence of gas jets. Besides, as the turbulence intensity depends on the motion of large eddies and the size of these large eddies determines the spray shape, the characteristics of the large eddies, including the integral length scale and Strouhal number, are evaluated.