The Effects of Injector Targeting and Fuel Volatility on Fuel Dynamics in a PFI Engine During Engine Warm-up: Part I - Experimental Results

Russ, S.; Stevens, J. L.; Aquino, Charles F.; Curtis, Eric W.; Fry, Jessica

doi:10.4271/982518

Cited by 16 publications

(1 citation statement)

References 9 publications

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“…Needless to say, reducing the engine-out UHCs emissions is the most important to optimize and to minimize the catalytic system. To correlate the liquid film formation in the engine and the engine-out UHCs emissions during cold start, various sophisticated optical techniques for directly observing the liquid film behavior in the intake manifold/cylinder and various fast-response exhaust-gas analyses for indirectly acquiring its behavior have widely been applied by many researchers; the internally-reflected-light method for liquid film thickness measurement, 9 direct observations of liquid film formation along with a fast-response gas analysis, 10–12 the laser-induced fluorescence (LIF), 13–15 the fast-response flame-ionization detector, 16 the fiber-based LIF, 17 and so on. To estimate the amount of the wall-wet fuel quantitatively, a unique engine having a rapid valve-train shutdown system in the intake manifold was proposed, 18 wherein the amount of wall-wet fuel was directly measured by confining the mixture in the intake manifold quickly.…”

Section: Introductionmentioning

confidence: 99%

Effects of injection parameters on the amount of wall-wet fuel in a port-fuel-injected spark-ignition engine during cold start

Araki

Sakairi

Kuribara

et al. 2019

International Journal of Engine Research

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In a four-stroke cycle port-fuel-injected spark-ignition engine, a significant portion of unburned hydrocarbons is exhausted during the short period of cold start. The aim of this study is to investigate the physics behind the wall-wet phenomena and its determining parameter as simply as possible even though qualitative to some extent. The test engine is driven at a constant speed of 350 r/min. The fuel injection starts at a certain cycle, and the cycles required for the first ignition is counted. Three gasoline injectors having different atomization characteristics are used for port fuel injection, and the droplet size, the spray angle and the spray velocity are varied independently. The fuel transport phenomena from the injector to the cylinder are characterized by only two parameters, α and β, the mass fraction of the fuel without wall-wet and the mass fraction of the evaporated fuel from liquid films on walls. They are determined so that all the first ignition cycles observed experimentally are consistently reproduced by the model. The value of α is successfully determined for every single injector, and it increases monotonously with the decrease in the Stokes number.

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