Effect of Injection Pressure on Droplet Behavior Inside Diesel Fuel Sprays

Kawaharada, Noritsune; Sakaguchi, Daisaku; Ueki, Hironobu; Ishida, M.

doi:10.4271/2015-01-1841

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…In spite of the differences in many test parameters (tables 1 and 5), the SMDs of LFO/diesel sprays reported by Hwang et al (2017) are similar to the SMDs of the present study. Kawaharada et al (2015) and Komada et al (2013) have also studied droplet diameters in diesel sprays, and the large range in their reported arithmetic mean diameters covers the results of this study. On the other hand, Cárdenas et al (2010) have found much smaller diameters, presumably due to substantially higher ambient temperatures.…”

Section: Droplet Sizessupporting

confidence: 75%

“…Nevertheless, the error due to motion blur was lower for the determination of opening angles as the transversal velocities of sprays are much lower. It is also noted that while Kawaharada et al (2015) and Komada et al (2013) have measured even higher velocities than the 200 m/s close to the nozzle, spray tip velocities decrease rapidly when increasing the distance from the injector. Using a characteristic length of 20 mm, the errors of 0.7 mm and 0.3 mm correspond to relative errors of 3.5% and 1.5%, respectively.…”

Section: Uncertaintiesmentioning

confidence: 98%

“…In literature, an increase in injection pressure is attributed to smaller droplet sizes (Cárdenas et al 2010, Dernotte et al 2012, Hwang et al 2017, Su et al 1995, Su and Farrell 1998, Wu et al 2015, and the results of the present study support this viewpoint. On the other hand, the results by Kawaharada et al (2015) suggest that the effect of injection pressure on droplet sizes would depend on the location of measurements. Regarding the effects of increased fuel viscosity, Dernotte et al (2012), Goldsworthy et al (2011), as well as Hiroyasu and Arai (1990) report increased SMDs, and the same trend has been observed with biodiesel and biodiesel blends that are characterized by higher viscosity, density, and surface tension than mineral diesel fuel Agarwal 2016, Hwang et al 2017).…”

Section: Droplet Sizesmentioning

confidence: 99%

See 2 more Smart Citations

Optical Investigation of Spray Characteristics for Light Fuel Oil, Kerosene, Hexane, Methanol, and Propane

et al. 2019

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The present study investigates fuel spray penetration and opening angles for EN 590 light fuel oil, kerosene, hexane, methanol, and propane. Furthermore, droplet sizes are studied for methanol and light fuel oil sprays from a single location at the edge of the sprays. The fuels were injected from a marine-size common rail diesel injector to a spray chamber filled with nitrogen, and the results were based on the analysis of shadow images. The results indicated that propane sprays would penetrate slower and less than the sprays of the other fuels, but that the differences are decreased and finally almost disappeared when increasing chamber density. Apart from the lowest tested chamber density of 1.2 kg/m 3 , propane formed significantly narrower sprays than the other fuels. With the exception of propane, the fuels had mostly similar responses to increased chamber densities. Variations between repetitions were large in relation to the differences in average values between the liquid fuels. Concerning droplet size measurements, the results suggested that methanol sprays would be characterized by slightly smaller droplet sizes than LFO sprays in the tested conditions. This finding is in line with an earlier study, albeit the found differences were smaller.

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Section: Droplet Sizessupporting

confidence: 75%

Section: Uncertaintiesmentioning

confidence: 98%

Section: Droplet Sizesmentioning

confidence: 99%

See 1 more Smart Citation

Optical Investigation of Spray Characteristics for Light Fuel Oil, Kerosene, Hexane, Methanol, and Propane

et al. 2019

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show abstract

“…Kawaharada et al examined the influence of injection pressure on the velocity and size of droplets in diesel spray. Their results showed that the droplet size under higher injection pressure was larger than the size under lower injection pressure at the spray center, but the reverse was true at the spray periphery [ 13 ]. Wang et al studied the influence of injection pressure fluctuations on spray behaviors, they showed that injection pressure fluctuations can increase the mixture quality [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Research on the internal flow and macroscopic characteristics of a diesel fuel injection process

Xia

2021

PLoS ONE

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The internal flow and macroscopic spray behaviors of a fuel injection process were studied with schlieren spray techniques and simulations. The injection pressures(Pin)and ambient pressures(Pout)were applied in a wide range. The results showed that increasing the Pin is likely to decrease the flow performance of the nozzle. Furthermore, increasing the Pin can increase the spray tip penetration. However, the effect of Pin on the spray cone angle was not evident. The spray cone angle at an injection pressure of 160MPa was 21.7% greater than at a pressure of 100MPa during the initial spraying stage. Additionally, the discharge coefficient increased under high Pout, and the decrease in Pout can promote the formation of cavitation. Finally, increasing the Pout can decrease the penetration, while the spray angle becomes wider, especially at the initial spray stage, and high Pout will enhance the interaction of the spray and the air, which can enhance the spray quality.

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“…However, it has been found that higher injection pressure does not necessarily lead to smaller droplet sizes in diesel sprays. 3 This suggests that droplet breakup and collision are more important determining factors of the mixing process. A recent study by Baumgarten 4 found that the disintegration of high-pressure diesel sprays begins inside the nozzle-hole, hence the liquid core does not exist.…”

Section: Introductionmentioning

confidence: 99%

Large-eddy spray simulation under direct-injection spark-ignition engine-like conditions with an integrated atomization/breakup model

Rutland

Pérez

et al. 2020

International Journal of Engine Research

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In this work, a hybrid breakup model tailored for direct-injection spark-ignition engine sprays is developed and implemented in the OpenFOAM CFD code. The model uses the Lagrangian–Eulerian approach whereby parcels of liquid fuel are injected into the computational domain. Atomization and breakup of the liquid parcels are described by two sub-models based on the breakup mechanisms reported in the literature. Evaluation of the model has been carried out by comparing large-eddy simulation results with experimental measurements under multiple direct-injection spark-ignition engine-like conditions. Spray characteristics including liquid and vapor penetration curves, droplet velocities, and Sauter mean diameter distributions are examined in detail. The model has been found to perform well for the spray conditions considered in this work. Results also show that after the end of injection, most of the residual droplets that are still in the breakup process are driven by the bag and bag–stamen breakup mechanisms. Finally, an effort to unify the breakup length parameter is made, and the given value is tested under various ambient density and temperature conditions. The predicted trends follow the measured data closely for the penetration rates, even though the model is not specifically tuned for individual cases.

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Effect of Injection Pressure on Droplet Behavior Inside Diesel Fuel Sprays

Cited by 5 publications

References 8 publications

Optical Investigation of Spray Characteristics for Light Fuel Oil, Kerosene, Hexane, Methanol, and Propane

Optical Investigation of Spray Characteristics for Light Fuel Oil, Kerosene, Hexane, Methanol, and Propane

Research on the internal flow and macroscopic characteristics of a diesel fuel injection process

Large-eddy spray simulation under direct-injection spark-ignition engine-like conditions with an integrated atomization/breakup model

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