Fuel Breakup Near Nozzle Exit of High-Pressure Swirl Injector for Gasoline Direct Injection Engine

Kawahara, Nobuyuki; Tomita, Eiji; Kasahara, Daisuke; Nakayama, Takashi; Sumida, Mamoru

doi:10.4271/2004-01-0542

Cited by 10 publications

(7 citation statements)

References 16 publications

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“…Kawahara and Nakayama [7] employed high-speed camera and long-distance microscope to explore the spray structure of Gasoline Direct Injection (GDI) engines near the swirl injector exit. They found that without using the swirl injector at the start of injection, the fuel behaves as a compact jet.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system

Ghahremani¹,

Jafari²,

Ahari³

et al. 2017

Scientia Iranica

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Abstract. In the present work, the spray characteristics of bio-ethanol and its blends have been experimentally and theoretically investigated. To have a comprehensive study, the e ects of ambient condition and injection pressure on the spray of di erent blends have been considered. Macroscopic and microscopic characteristics of spray such as tip penetration length, cone angle, projected area, volume, Sauter Mean Diameter (SMD), and Ohnesorge number are investigated precisely. Besides, air entrainment and atomization analyses have been carried out to improve mixture formation process. Using curve tting and least squares method, theoretical correlations have been suggested in such a way to predict experimental results with the accuracy of 9.9%. To have a good estimation of the calculated parameters, uncertainty analysis has been performed. The results demonstrate that enhancing the injection pressure or decreasing the ambient pressure improves the atomization characteristics of spray. Moreover, outcomes of this study indicate that spray tip penetration is enhanced by increasing the injection pressure or bio-ethanol percentage in the blend, while spray cone angle showing the opposite behavior.

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Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system

Ghahremani¹,

Jafari²,

Ahari³

et al. 2017

Scientia Iranica

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“…Other notable experimental studies are those of Shinjo and Umemura [13], Zhoulang et al [14], Lee and Park [15], Cipolat and Valentim [16]. Theoretical and experimental injection spray characteristics were compared in a study by Zhao et al [18]. Two models that were drawn from the literature were compared on the basis of capacity to duplicate experimental data.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, most of them are local to diesel fuel sprays and biodiesel. Among this category are the contribution in Kawahara et al [18], Jiang et al [19] , Vita and Alloca [20] . Su et al [21] studied the atomization and breakup characteristics of liquid jets at various spray conditions, using the large eddy simulation approach.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of Breakup and Atomization Characteristics of Gasoline-Ethanol (Gashols) Fuel Blends

Altraide

2022

etj

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To meet the increasingly stringent constraints on mobile and point emissions in the wake of the dwindling fortunes of fossil fuels, evaluation of hybrid fuels for application in combustion engines has become an imperative, especially in the third world countries. This paper presents, modeling of atomization characteristics of gasoline-ethanol fuel blends. Fuel breakup models and correlations between flow patterns and droplet characteristics were adopted and implemented in OpenFOAM Computational Fluid Dynamics (CFD) modeling suite for direct gasoline injector using a simple cylindrical mesh structure at constant volume. The Rosin Rammler distribution model was used to generate the number of spray particles injected into the cylinder. The spray modeling and atomization employed the use of blob sheet model and Kelvin-Helmholtz-Rayleigh-Taylor (KH-RT) model while the numerical technique for simulating atomization process by CFD included the use of governing equations such as Eulerian for gas phase, Lagrangian for disperse phase and turbulence modeling. The effects of fuel blends, injection pressure, ambient gas pressure and spray cone angle were evaluated on the axial spray tip penetration, spray width, and overall Sauter Mean Diameter (SMD). The SMD was seen to be affected by varying the degree of injection cone angle. The spray tip penetration lengths were larger for higher injection cone angles while higher penetration lengths were obtained at higher injection pressures. One salient conclusion drawn from the modeling is that as the number of particle increased, the density of clusters became smaller.

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“…The images used here to measure the length and thickness of the liquid sheet have an intensily distribution indicated by gray-scale pixels. Thesc images were converted to black and white using a certain threshold Ievel to clearly indicate the edge of the iiquid sheet [15]. Length of the liquid sheet was defined as the continuous part from the nozzle exit.…”

Section: Introductionmentioning

confidence: 99%

“…C]ear ligaments structure of liquid sheet can be recognized at higher infection pressure. From these images, the wavelength of surface waves can be measured [15]. From the difTerence between the ambient (back) pressure and iniection pressure, the velocity of liquid sheet was estimated.…”

Section: Introductionmentioning

confidence: 99%

Liquid Sheet Break-up of High-Pressure Swirl Injector for DISI Engine(Spray Technologies, Atomization)

Kawahara

Tomita

Kasahara

et al. 2004

COMODIA

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Fuel Breakup Near Nozzle Exit of High-Pressure Swirl Injector for Gasoline Direct Injection Engine

Cited by 10 publications

References 16 publications

Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system

Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system

Simulation Study of Breakup and Atomization Characteristics of Gasoline-Ethanol (Gashols) Fuel Blends

Liquid Sheet Break-up of High-Pressure Swirl Injector for DISI Engine(Spray Technologies, Atomization)

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