Numerical Analysis of Fuel Behavior in a Port-Injection Gasoline Engine

Nagaoka, Makoto; Ohsawa, Katsuyuki; Crary, Brent; Yamada, Toshio; Sugiura, Shigeki; Imatake, Nobuo

doi:10.4271/970878

Cited by 26 publications

(9 citation statements)

References 8 publications

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“…O'Rourke et al [15] included a liquid film model in the code Kiva-3V [16] using the particle Lagrangian approach of the Kiva spray description. Nagaoka et al [17] used a particle film model in 3D calculations of SI engines. Stanton et al [18,19], Bai et al [20] and AhmadiBefrui et al [21], Foucart et al [22,23], have developed liquid film models using eulerian continuous approaches.…”

Section: Model Descriptionmentioning

confidence: 99%

“…In one hand, T s is approximated by the integral film temperature T. In the other hand, U → s is calculated using a laminar parabolic liquid velocity profile. We have obtained the following expression: (17) The Spalding mass transfer number is calculated using the mass fraction of fuel at the film interface, Y s , and the free stream fuel mass fraction, Y ∞ :…”

Section: Volume Source Term S ·mentioning

confidence: 99%

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Influence of the Wall Temperature on the Mixture Preparation in Di Gasoline Engines

Habchi

Foucart²,

Baritaud

1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Influence de la température de paroi sur la préparation du mélange dans les moteurs à essence à injection directe -Des modèles d'interaction spray-paroi et de film liquide ont été développés et appliqués afin de mieux décrire la distribution du carburant dans les moteurs à essence à injection directe sur une géométrie de concept wide spacing. Plusieurs calculs prenant également en compte la combustion ont été effectués pour étudier l'influence de la température du piston sur la préparation du mélange en condition stratifiée. Lors des phases de démarrage à froid, jusqu'à 25 % de la masse injectée participe à la formation d'un film dans le bol du piston. Ceci influe considérablement sur la combustion. L'élévation de la température du piston réduit la quantité de film formé et non brûlé. Il ne reste quasiment pas de film quand sa température dépasse la moyenne entre la température d'ébullition et la température de Leidenfrost du carburant. Ce résultat est en accord avec des observations expérimentales qui confirment l'absence de film liquide pour des températures de paroi supérieures à 460 K.Mots-clés : Modélisation, moteur, injection directe, préparation du mélange, film liquide, interaction spray-paroi, évaporation. Abstract -Influence of the Wall température on the Mixture Preparation in DI Gasoline Engines

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Section: Model Descriptionmentioning

confidence: 99%

Section: Volume Source Term S ·mentioning

confidence: 99%

Influence of the Wall Temperature on the Mixture Preparation in Di Gasoline Engines

Habchi

Foucart²,

Baritaud

1999

Oil & Gas Science and Technology - Rev. IFP

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show abstract

“…Based on the experimental results, several models were proposed to deal with the wall film formation and film dynamics [15][16][17]. Based on the wall film model, numerical investigations using computational fluid dynamics (CFD) can be used to estimate the wall film formation and evaporation characteristics [1].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional numerical investigation on wall film formation and evaporation in port fuel injection engines

Liu

Yan

Jia

et al. 2016

Numerical Heat Transfer, Part A: Applications

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Wall film formation and evaporation were studied on a flat wall inside a constant-volume vessel using a three-dimensional numerical method. The computation was based on the discrete phase model (DPM) of spray dispersion, a spray-wall interaction model coupled with an enhanced wall film evaporation sub-model, in which the operating conditions of cold wall are considered for port fuel injection (PFI) engines. The influence of impacting parameters including injection pressure, the impingement distance from the injector and the impinged wall, injection duration, impingement angle, and wall temperature was discussed. ARTICLE HISTORY

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“…Since some of the injected fuel remains in the intake port as a liquid after the injection event and the intake stroke, researchers have investigated these liquid fuel puddles experimentally [9] and with models. The modelling efforts are frequently very detailed [10][11][12][13][14] and provide interesting physical insights into intake port fuel dynamics. These models, however, are quite complex and would be difficult to implement in fast engine simulation codes [15,16] required for engine development and control.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous in-cylinder and exhaust cycle resolved non-dispersive infrared and flame ionization detector experimental sampling results during cranking and startup in a port fuel injection co-operation fuel research engine

Cowart

Hamilton

2008

International Journal of Engine Research

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Optimization of in-cylinder air—fuel mixture preparation in port fuel injected engines during all phases of operation is critical for maximizing engine performance while minimizing harmful emissions. In this study, a co-operative fuels research (CFR) gasoline engine is used to evaluate torque and measure in-cylinder and exhaust CO, CO2, and unburned hydrocarbons under various fuelling and spark conditions during cranking and startup phases. Fast flame ionization detectors and non-dispersive infrared fast CO and CO2 detectors are used as the principal diagnostics. Measured component trends are shown with detailed explanations. CFR engine exhaust unburned hydrocarbon levels are shown to be 3 to 7 times higher for startup than for steady state operation depending on spark timing and fuelling. Torque is found to be relatively insensitive to fuelling within 5 per cent of stoichiometric. Additionally, in-cylinder and exhaust CO levels are strong functions of startup enrichment. Exhaust CO, much easier to measure than in-cylinder CO, could be used to meter fuel more tightly during startup in order to reduce undesirable emissions. Exhaust CO levels can be at or below stabilized engine steady state levels depending on fuelling levels. Exhaust CO2 measurements are found to be not reliable indicators of in-cylinder conditions.

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Numerical Analysis of Fuel Behavior in a Port-Injection Gasoline Engine

Cited by 26 publications

References 8 publications

Influence of the Wall Temperature on the Mixture Preparation in Di Gasoline Engines

Influence of the Wall Temperature on the Mixture Preparation in Di Gasoline Engines

Three-dimensional numerical investigation on wall film formation and evaporation in port fuel injection engines

Simultaneous in-cylinder and exhaust cycle resolved non-dispersive infrared and flame ionization detector experimental sampling results during cranking and startup in a port fuel injection co-operation fuel research engine

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