High-speed imaging of transient diesel spray behavior during high pressure injection of a multi-hole fuel injector

Eagle, W. Ethan; Morris, Steven B.; Wooldridge, Margaret S.

doi:10.1016/j.fuel.2013.07.120

Cited by 61 publications

(26 citation statements)

References 16 publications

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“…As has been noted in previous works [17,18,28,29], increasing the injection pressure lead to an increase in rate of the spray tip penetration while an increase in the ambient density lead to a reduction in the rate of the spray tip penetration. An increase in P inj results in an increase in the spray momentum and an increase in q amb results in an increase in aerodynamic drag on the emerging spray.…”

Section: Tip Penetrationsupporting

confidence: 61%

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Optical characterization of Diesel and water emulsion fuel injection sprays using shadowgraphy

Emberson

Ihracska

Imran

et al. 2016

Fuel

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h i g h l i g h t sFuel injection sprays have been examined using a focused shadowgraph system. Diesel and Diesel and water emulsions containing 10% and 20% water examined. Temporal evolution of the spray cone angle and tip penetration have been measured. Emulsification reduced the cone angle at injection pressure of 500 bar. Emulsification had no discernable influence on the tip penetration. t r a c tDiesel fuel and water emulsions have been shown to reduce emissions of NO x and PM from compression ignition engines. There is a lack of work examining the influence of emulsification on the sprays formed during injection. This work examines the spray cone angle and tip penetration of Diesel fuel and water emulsions, containing 10% and 20% water (by mass). All experiments were conducted under nonreacting, non-vaporizing conditions in a constant volume pressure chamber filled with nitrogen. A focused shadowgraph system, with high speed photography, coupled with a research, high current LED system was used. Differences in the spray cone angle suggest the emulsification did have an effect for the injections at a pressure of 500 bar. Emulsification had no discernible effect on the spray tip penetration. Spray tip penetration showed agreement with previous trends in terms of proportionality to time after start of injection however agreement with models found in the literature was not consistent.

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Section: Tip Penetrationsupporting

confidence: 61%

“…The most widely excepted findings and developed correlations come from the work of Hiroyasu and Arai [20] which is still used for comparison purposes in current work [16,28,29]. In [20], two distinct periods of tip development were identified.…”

Section: Characterization Of Fuel Spraysmentioning

confidence: 99%

Optical characterization of Diesel and water emulsion fuel injection sprays using shadowgraphy

Emberson

Ihracska

Imran

et al. 2016

Fuel

View full text Add to dashboard Cite

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“…In the study of merging sprays [13], the twin sprays are highly interactive due to the collision and evolve very differently from single-plume sprays. On the other hand, other studies [14,15] suggest that in case of separation angles more than 15 o , level of interaction is low enough to allow every spray plume to be considered individually. An example of such a condition is reported in the experimental imaging of multi-plume sprays [15].…”

Section: Introductionmentioning

confidence: 98%

“…On the other hand, other studies [14,15] suggest that in case of separation angles more than 15 o , level of interaction is low enough to allow every spray plume to be considered individually. An example of such a condition is reported in the experimental imaging of multi-plume sprays [15]. The study reports macroscopic characteristics of multi-plume spray development with a focus on the transitional period.…”

Section: Introductionmentioning

confidence: 98%

“…One important factor in the study of multi-plume spray systems is the level of interactions between the individual sprays. An example of such a condition is reported in the experimental imaging of multi-plume sprays [15]. On the other hand, other studies [14,15] suggest that in case of separation angles more than 15 o , level of interaction is low enough to allow every spray plume to be considered individually.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of liquid and gas phases in multi-plume spray injection

Ghasemi

Pereira

2016

Int. J. Energy Res.

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Summary In this study, the unsteady development of multi‐plume sprays has been investigated by large eddy simulations with Eulerian–Lagrangian multiphase approach for both global spray characteristics and local flow features. Multi‐plume sprays are injected at the injection pressures of 10 MPa and 15 MPa, and the temperature of Ts = 297.65 K into the ambient air at the atmospheric pressure and temperature of Ta = 293.15 K. Experimentally obtained global multi‐plume spray characteristics in terms of spray shape and penetration are used to validate the present numerical simulations. The present numerical predictions for Sauter mean diameter and its temporal variation agree well with the empirical correlations. The predicted droplet size distribution evolves temporally and spatially, and exhibits bimodal distribution, until eventually the mode for small droplet sizes dominates. The spray plumes are found to have limited interaction due to the relatively large orientation angles between the plumes. Because of the momentum transfer from the liquid to gas phase, spray‐induced air jets appear in the multi‐plume sprays. Using vorticity, pressure, and λ2 − criterion fields, it is shown that the spray‐induced air jets form similar vortical structures as single phase jets. Similarities between the spray‐induced air jets and single phase jets in terms of the shear layer vortical structures such as hairpin‐like vortices improves our understanding of the entrainment and mixing processes in multi‐plume sprays. Copyright © 2016 John Wiley & Sons, Ltd.

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Experimental Study of the Spray Characteristics of Diesohol Fuel using a High‐Pressure Common‐Rail Injection System in a Diesel Engine

et al. 2015

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The spray characteristics of diesohol fuel have a direct effect on the thermal efficiency and combustion emissions performance of diesel engines. In this research, we investigated the spray characteristics of diesohol fuel under different fuel injection pressures (Pinj) in a high‐pressure common‐rail injection system and at various spray ambient pressures (Pamb) in a constant‐volume pressure vessel by using high‐speed photography technology. The research results support the concept of adding a certain percentage of ethanol to diesel, creating diesohol fuel, which can reduce the environmental impacts of vehicle emissions. Experiments on the spray characteristics were performed and the results suggested that the addition of ethanol has no significant effect on the spray tip penetration, spray cone angle, and spray tip speed. However, atomization conditions such as injection pressure and ambient pressure have a significant impact on the spray characteristics of the blended fuel.

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High-speed imaging of transient diesel spray behavior during high pressure injection of a multi-hole fuel injector

Cited by 61 publications

References 16 publications

Optical characterization of Diesel and water emulsion fuel injection sprays using shadowgraphy

Optical characterization of Diesel and water emulsion fuel injection sprays using shadowgraphy

Evolution of liquid and gas phases in multi-plume spray injection

Experimental Study of the Spray Characteristics of Diesohol Fuel using a High‐Pressure Common‐Rail Injection System in a Diesel Engine

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