Spray Atomization Study on Multi-Hole Nozzle for Direct Injection Gasoline Engines

Abe, Motoyuki; Ehara, Hideharu; Masahiro, Soma; Ishikawa, Toru

doi:10.4271/2013-01-1596

Cited by 8 publications

(13 citation statements)

References 9 publications

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“…Fuel flow around the orifices affect is discussed in this chapter by theoretical approach. According to previous experimental investigation (Abe, et al, 2013) has showed that fuel velocity in orifice can be described by using ratio of the seat-gap and the orifices area, where the ratio K (passage area ratio) is defined as equation (3).…”

Section: Theoretical Discussion Of Flow Around Orificesmentioning

confidence: 99%

“…Generally, the gap affects flow motion and phenomena around the orifice hole, it might affect atomization process. Thus authors have investigated the DIG nozzles experimentally, and found that a coefficient of relation between velocity and droplet size is different from diesel nozzle (Abe, et al, 2013). Further, the previous study showed that droplet size from DIG nozzles can be described by using geometry factors around orifice.…”

Section: Nozzlementioning

confidence: 99%

“…A typical solenoid injector for DIG (Abe, et al, 2013) is described in Fig.1 as sectional image, and its structure around orifice is shown in Fig.2. In an operation state, pressurized fuel is supplied from a fuel-rail, and is filled in the injector (Fig.1).…”

Section: Structure Of Multi-hole Injector For Digmentioning

confidence: 99%

“…According to previous experimental investigations (Abe, et al, 2013), spray characteristics (droplet diameter and flow rate) are mainly determined by area of the gap and total section area of the orifices. The area of the seat-gap is determined by diameter of valve-seat and angle of the tapered valve seat, which is geometrically described as equation (1).…”

Section: Structure Of Multi-hole Injector For Digmentioning

confidence: 99%

See 3 more Smart Citations

Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines

Abe

Ishii

Ehara

2017

JFST

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Section: Theoretical Discussion Of Flow Around Orificesmentioning

confidence: 99%

Section: Nozzlementioning

confidence: 99%

Section: Structure Of Multi-hole Injector For Digmentioning

confidence: 99%

Section: Structure Of Multi-hole Injector For Digmentioning

confidence: 99%

See 2 more Smart Citations

Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines

Abe

Ishii

Ehara

2017

JFST

Self Cite

View full text Add to dashboard Cite

“…For a detailed summary of the work carried out, see Gostic [7]. The very few examinations of nozzle hole geometry in gasoline direct injection engines are restricted to the length-to-diameter ratio [8,9], the inlet shape of the nozzle hole [8] and the nozzle hole diameter [10]. Extensive studies of Gilles-Birth [11] based on the analysis of valve covered orifice nozzles (VCO) are not used in today's gasoline direct injection (GDI) engines.…”

Section: Introductionmentioning

confidence: 99%

Optical analysis of the influence of injector hole geometry on mixture formation in gasoline direct injection engines

Wetzel

2016

Automot. Engine Technol.

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New and increasingly strict emission standards demand a reduction in the raw emissions from today's gasoline direct injection engines. The optimisation of mixture formation by means of the injector and, in particular, the injector hole geometry offers significant potential in this respect. To achieve this, however, it is crucial to have a basic understanding of the influence of the geometry on spray breakup. To investigate this influence, a test matrix with ten different injector hole geometries was created. This included cylindrical, convergent, divergent and stepped injector holes. Different measuring techniques were used to analyse the microscopic and macroscopic spray parameters as well as the internal flow in the nozzles.

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Experiment methods and apparatus for finely controlled partial needle lift measurements with a gasoline direct injector

Hillstrom

Midlam-Mohler

Stockburger

2022

International Journal of Engine Research

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In this study, an experiment method and apparatus are developed which allow exploration of partial-lift spray in a production gasoline direct injection (GDI) injector. For this injector, discretizing the needle’s stroke into a series of steady partial-lift tests seems a viable approach for quantifying transient behavior, where spray performance is often inferior from the perspective of emissions. However, performing such tests is not trivial due to manufacturing challenges and material limitations making it difficult to isolate any particular lift at pressure. To explore the applicability of fixed partial-lift tests, the following are performed: (1) An inward-opening multi-hole GDI injector is minimally modified with an apparatus to finely control needle lift by limiting the needle’s stroke with a fine micrometer head. (2) An experiment process is developed to associate the micrometer set-point with the imposed needle lift, compensating for pressure induced component flex. This flex is significant and of a similar magnitude to the needle’s stroke. (3) In-nozzle flow is simulated using computational fluid dynamics (CFD) within the AVL FIRE software to compare a stationary and moving needle. The comparison reveals a relative insignificance of needle velocity for the majority of the needle’s stroke (>5 μm). The nozzle hole flow rates and effective exit velocities are similar, suggesting fixed partial-lift spray well approximates the normally moving needle spray. This new experiment method can be used on current injectors to quantify spray performance during needle transients by discretizing the stroke into steps as small as 2 μm, exceeding the control in any current published literature.

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Spray Atomization Study on Multi-Hole Nozzle for Direct Injection Gasoline Engines

Cited by 8 publications

References 9 publications

Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines

Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines

Optical analysis of the influence of injector hole geometry on mixture formation in gasoline direct injection engines

Experiment methods and apparatus for finely controlled partial needle lift measurements with a gasoline direct injector

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