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雾化与喷雾
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ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.v9.i2.60
pages 215-229

DROP DYNAMICS IN THE PORT OF A SPARK IGNITION ENGINE

L. M. Nemecek
Department of Mechanical and Aerospace Engineering and Engineering Mechanics, University of Missouri—Rolla, Rolla, Missouri, USA
R. M. Wagner
Department of Mechanical and Aerospace Engineering and Engineering Mechanics, University of Missouri—Rolla, Rolla, Missouri, USA
James A. Drallmeier
Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, USA

ABSTRACT

Drop momentum and drop slip in the transient gas-phase environment found in the intake port of a spark ignition engine play a role in the fuel delivery process to the cylinder. A study was conducted to investigate drop dynamics using a single-cylinder port fuel-injected engine fitted with a two-dimensional optically accessible intake port. The experimental procedure used externally clocked single-component phase Doppler interferometry which provided time-resolved results with respect to the engine cycle. The effects of fuel drop size and valve timing on drop trajectory and entrainment into the gas-phase flow were examined. The data were analyzed according to drop size and time of arrival at the probe volume. It was found that entrainment of the liquid phase into the gas phase is a function of both drop size and the local rate of change of the gas-phase velocity vector. A temporal Stokes number analysis was developed and compared to the experimental results to provide quantitative predictions of drop size requirements for entrainment during gas-phase transients.


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