Group-Hole Nozzle Effects on Mixture Formation and In-cylinder Combustion Processes in Direct-Injection Diesel Engines

Gao, Jian; Matsumoto, Yuichi; Namba, Makoto; Nishida, Keiya

doi:10.4271/2007-01-4050

Cited by 22 publications

(23 citation statements)

References 30 publications

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“…7, and can be seen to closely follow the experimental results. For both predicted and experimental results, the parallel group-hole nozzle has similar spray tip penetration to a single-hole nozzle with the same overall hole area, consistent also with previous studies (Tokudo et al, 2005;Nishida et al, 2006;Moon et al, 2008;Gao et al, 2007). The total injected momentum from the parallel group-hole nozzle is the same as that from the single-hole nozzle.…”

Section: Validation Of the Gas Jet Superimposition Model And Effect Osupporting

confidence: 90%

“…Previous studies have shown that the spray tip penetration gets shorter and the spray cross-section becomes ellipsoidal as the converging angle increases due to the interactions between the two jets (Nishida et al, 2006;Gao et al, 2007). Therefore, the performance of the superposition model and its ability to predict spray shapes properly for converging group-hole nozzles was of interest.…”

Section: Effect Of Nozzle Layout On Rate Of Injection and Determinatimentioning

confidence: 98%

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A gas jet superposition model for CFD modeling of group-hole nozzle sprays

Park

Reitz

2009

International Journal of Heat and Fluid Flow

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Section: Validation Of the Gas Jet Superimposition Model And Effect Osupporting

confidence: 90%

Section: Effect Of Nozzle Layout On Rate Of Injection and Determinatimentioning

confidence: 98%

A gas jet superposition model for CFD modeling of group-hole nozzle sprays

Park

Reitz

2009

International Journal of Heat and Fluid Flow

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“…Gao et al [9] reported that a hole-type direct injection (DI) diesel injector enhanced air-fuel mixing and fuel evaporation. Gao et al [10] investigated the use of a grouped-hole nozzle and showed that fuel atomization and evaporation contributed to a decrease in flame luminosity level over the whole ignition and combustion period. Nishida et al [11] investigated the formation of spray mixtures in various grouped-hole nozzles, and Sato et al [12] and Matsumoto et al [13] also conducted similar experimental studies.…”

Section: Introductionmentioning

confidence: 99%

Effect of grouped-hole nozzle geometry on the improvement of biodiesel fuel atomization characteristics in a compression ignition engine

Suh

Park

Lee

2009

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper describes the influence of grouped-hole nozzle geometry on the atomization characteristics of a biodiesel fuel. The effects of injection rate profile, spray evolution, droplet mean diameter, and mean velocity of the droplets are investigated in a highpressure injection system.A grouped-hole nozzle with 16 holes driven by piezo stack was used in the experiments and the obtained results are compared with those obtained using a single-hole nozzle with the same overall nozzle area. The effect of using a split fuel injection strategy on the spray atomization was analysed using a grouped-hole nozzle with 12 holes. The time-based injection rate profiles for a biodiesel fuel, i.e. the mass flowrate of the fuel injector nozzle were obtained from the pressure variation generated when the fuel was injected into a tube filled with fuel. The spray and atomization performance for biodiesel fuel injected through a grouped-hole nozzle were visualized and measured by a visualization system and droplet analyser system, respectively.It was revealed that the biodiesel injection rate profile from a single-hole nozzle with the same overall nozzle area shows a similar injection rate profile to that of the grouped-hole nozzle. The injection rate profiles for a split injection strategy are lower than for a single injection and the peak value of the second injection is lower than for the first injection. The Sauter mean diameter distributions of biodiesel from the grouped-hole nozzle have a larger diameter because the small droplets injected through the grouped-hole nozzle collide and coalesce with each other, which leads to an increase in droplet diameter. From these results, it can be concluded that the use of a grouped-hole nozzle and split injection strategy does not improve on the fuel atomization performance for biodiesel fuel for a single-hole nozzle.

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“…Diverging nozzles with positive included angle between the sprays showed a tendency to reduce penetration length while improving the atomization. Penetration length and atomization increase for the cluster nozzles with higher injection pressures [90,91].…”

Section: Cluster Conceptmentioning

confidence: 99%

“…Gao et al [91] investigated the flame propagation of sprays from a conventional nozzle and a cluster nozzle with two orifice circles and 10 between the divergent sprays in an optical engine. They observed significantly reduced soot luminosity for the sprays in the test runs with the cluster nozzles.…”

Section: Cluster Conceptmentioning

confidence: 99%