The Investigation of Mixture Formation and Combustion with Port Injection System by Visualization of Flame and Wall Film

Yumoto, Miki; Gotō, Kazuhiro; Kato, Shoichi; Iida, Masahiro

doi:10.4271/2011-01-1887

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…For direct-injection engines, the fuel spray plays a significant role in in-cylinder mixing and is a potential source of significant CCVs. Previous research has included work looking at both the isolated spray in a constant volume chamber [26][27][28] and in engines [29][30][31][32][33][34]. However few of these studies focused on the effects of spray variability, and there remains work to increase our understanding of the relative impacts of spray variability on the overall flow and mixing variability in a direct-injection engine.…”

Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulations of Spray Variability Effects on Flow Variability in a Direct-Injection Spark-Ignition Engine Under Non-Combusting Operating Conditions

Dam¹,

Sjöberg²,

Som³

2018

SAE Technical Paper Series

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L arge-eddy Simulations (LES) have been carried out to investigate spray variability and its effect on cycle-tocycle flow variability in a direct-injection spark-ignition (DISI) engine under non-reacting conditions. Initial simulations were performed of an injector in a constant volume spray chamber to validate the simulation spray set-up. Comparisons showed good agreement in global spray measures such as the penetration. Local mixing data and shot-to-shot variability were also compared using Rayleigh-scattering images and probability contours. The simulations were found to reasonably match the local mixing data and shot-to-shot variability using a random-seed perturbation methodology. After validation, the same spray set-up with only minor changes was used to simulate the same injector in an optically accessible DISI engine. Particle Image Velocimetry (PIV) measurements were used to quantify the flow velocity in a horizontal plane intersecting the spark plug gap. The engine was operated in a skip-fired operating mode and comparisons focused on cycles that included fuel injection, but no spark event and therefore no combustion. 105 total LES engine cycles were simulated using a parallel cycle simulation approach and 3 different perturbation methods in an attempt to isolate the effects of shot-to-shot spray variability and the initial turbulent flow field as well as their interaction effects on overall engine CCVs. The experimental mean and standard deviations were reasonably well matched by the simulations, though quantitative comparisons near the injection event during the intake stroke were difficult due to the high uncertainty in the PIV measurements at these crank angles. The 3 simulation perturbation methods resulted in very similar results, though further analysis found the current parallel cycle approach may be limiting the ability of the simulations to isolate the spray and flow effects.

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Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulations of Spray Variability Effects on Flow Variability in a Direct-Injection Spark-Ignition Engine Under Non-Combusting Operating Conditions

Dam¹,

Sjöberg²,

Som³

2018

SAE Technical Paper Series

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“…Für eine solch globale Perspektive in einem thermodynamischen Motor eignet sich, mit der Einschränkung durch das darstellbare Sichtfeld, die High-Speed Video Endoskopie. Mit endoskopischen Zugängen für sichtbares Licht in Saugrohr und Brennraum haben beispielsweise Yumoto et al[126] die Wechselwirkung zwischen Gemischbildung im Saugrohr und Verbrennung im Brennraum an einem Motorradmotor untersucht. Insbesondere bei saugmotorischer Volllast wurden große Wandfilme im Einlasskanal festgestellt.…”

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Untersuchung der innermotorischen Einflussgrößen auf die Partikelemission eines Ottomotors mit Saugrohreinspritzung

Schück¹

2021

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This research work comprises experiments intending to understand the particulate formation mechanisms of spark ignition (SI) engines with port fuel injection (PFI) as well as the analysis of measures to enhance the mixture formation process in order to reduce particulate number emissions (PN). Basic investigations were performed in an evaporation box, which was designed in the shape of a real intake port. This way not only the evaporation characteristics of different sprays but also the spay-wallinteraction could be evaluated. It is known that fuel wall films are a major source for particulate formation. High-speed images were acquired to analyse and minimize wall fuel films within the combustion chamber of a motored transparent engine using a glass cylinder. This way wall fuel films could be visualized and quantified by means of their surface area. A number of different parameters influencing the emission of PN was investigated on a four-cylinder research engine, which is optically accessible through endoscopes in both the combustion chamber as well as the intake manifold.

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Effect of injection timing on mixture formation and combustion in an ethanol direct injection plus gasoline port injection (EDI+GPI) engine

Huang

Hong

Huang

2016

Energy

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Ethanol direct injection plus gasoline port injection (EDI+GPI) is a new technology to utilise ethanol fuel more effectively and efficiently in spark-ignition engines by taking the advantages of ethanol fuel and direct injection, such as the cooling effect and anti-knock ability. A full cycle numerical modelling including both port and direct injection sprays was performed to understand the mechanisms behind the experimental results of the EDI+GPI engine. The turbulence-chemistry interaction of the two-fraction-mixture partially premixed combustion was solved by a five-dimensional presumed Probability Density Function table.Effects of direct injection timing on fuel evaporation, mixing, wall-wetting, combustion and emission processes were investigated. The results showed that when the direct injection timing was retarded, the mixture around the spark plug became leaner and the distribution of equivalence ratio became more uneven.Moreover, late direct injection resulted in severe fuel impingement and caused local over-cooling effect and over-rich mixture. Consequently, the combustion speed and temperature were decreased by retarded direct injection timing, leading to reduced NO emission and increased HC and CO emissions. Finally, numerical modelling was performed to investigate the strategy of injecting small amount of ethanol fuel on reducing the fuel impingement and incomplete combustion caused by late direct injection.

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The Investigation of Mixture Formation and Combustion with Port Injection System by Visualization of Flame and Wall Film

Cited by 3 publications

References 8 publications

Large-Eddy Simulations of Spray Variability Effects on Flow Variability in a Direct-Injection Spark-Ignition Engine Under Non-Combusting Operating Conditions

Large-Eddy Simulations of Spray Variability Effects on Flow Variability in a Direct-Injection Spark-Ignition Engine Under Non-Combusting Operating Conditions

Untersuchung der innermotorischen Einflussgrößen auf die Partikelemission eines Ottomotors mit Saugrohreinspritzung

Effect of injection timing on mixture formation and combustion in an ethanol direct injection plus gasoline port injection (EDI+GPI) engine

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