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雾化与喷雾
影响因子: 1.262 5年影响因子: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.v7.i6.50
pages 629-648

FUEL DELIVERY IN A PORT FUEL INJECTED SPARK IGNITION ENGINE

R. M. Wagner
Department of Mechanical and Aerospace Engineering and Engineering Mechanics, University of Missouri—Rolla, Rolla, Missouri, USA
L. M. Nemecek
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

The goal of this study was to investigate the effects of injector characteristics and injection timing on fuel mass delivery to the valve in a fired spark ignition engine. The relationship between injection timing and fuel arrival at the intake valve must be known for designing an injection system for increased liquid entrainment into the gas phase and minimized fuel wetting of the port walls. Fuel spray behavior from a conventional injector design and prototype vacuum-assist and air-assist injector designs is investigated by measuring fuel drop size and velocity at the intake valve using phase Doppler interferometry. The results of this study indicate the amount of time required for the fuel spray to reach the intake valve is constant and independent of injection timing. However, the width of the temporal fuel spray arrival distribution is a strong function of injection timing. Injection timing and the corresponding gas-phase dynamics have the strongest impact on the smallest drops, resulting in a redistribution of the drops with respect to size. In addition, the fuel spray behavior was investigated at the start of the intake valve event when hot cylinder gases flow into the intake port. The arithmetic mean diameter of the fuel film atomized off the back of the intake valve during this period was found to range from 55 to 65 μm.


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