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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v24.i1-3.370
pages 370-379

Characterization of Cavitation Flow in a Simple Hole Nozzle

Keiya Nishida
Department of Mechanical System Engineering, University of Hiroshima, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
Steven L. Ceccio
Department of Mechanical Engineering University of Michigan Ann Arbor, Michigan 48109-2140 U.S.A.
Dennis N. Assanis
University of Michigan, 1231 Beal Ave., Ann Arbor, MI 48109, USA
N. Tamaki
Department of Mechanical Engineering, Kinki University Takaya, Umenobe, Higashi Hiroshima, 739-2116, Japan
Hiroyuki Hiroyasu
Institute of Industrial Technology, Kinki University, Higashi-Hiroshima, Japan

ABSTRAKT

The liquid fuel flow in a nozzle hole is thought to be closely related to the breakup processes of the spray by pressure type atomization. Typical applications of this type of atomization are seen in diesel and direct injection gasoline injectors. In this study, experiments were made for clarifying the relation between the internal flow of the nozzle hole, especially the flow with cavitation bubbles, and the breakup process of the spray. A simply shaped nozzle, which had a single hole 0.5 mm in diameter and was made of transparent acrylic resin, was used for observing the internal flow of the nozzle hole. Water pressurized in an accumulator was injected from the nozzle. In addition to the observation of the internal flow of the nozzle hole and the liquid jet injected from the nozzle, measurements were made of the discharge coefficient, the acoustic intensity and the impedance of the internal flow of the nozzle hole. Variations in the discharge coefficient, the acoustic intensity and the impedance with the differential pressure of the injection are closely related to the growth and collapse of cavitation bubbles in the internal flow of the nozzle hole. The acoustic intensity increases especially in the high frequency range when the cavitation bubbles develop with the differential pressure of the injection, and the peaks of the acoustic intensity in the high frequency range disappear when the cavitation bubbles largely develop and a hydraulic flip occurs. Also the impedance increases suddenly by the detachment of the liquid surface from the inner wall.


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