Effects of Orifice Internal Flow on Breakup Characteristics of like-Doublet Injectors

Jung, Kwangyun; Khil, Taeock; Yoon, Youngbin

doi:10.2514/1.20362

Cited by 30 publications

(14 citation statements)

References 10 publications

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“…Furthermore, flow characteristics at the nozzle exit have been shown to determine spray behavior, both under evaporative and non-evaporative conditions [10][11][12][13]. It is expected that the use of fuels with different properties would have significant effect in the air-fuel mixing process and combustion behavior.…”

Section: Introductionmentioning

confidence: 99%

Consequences of using biodiesel on the injection and air–fuel mixing processes in diesel engines

Salvador

Ruíz

Salavert

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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A study of the injection process and spray behavior has been made for three different fuels. In particular, blends of rapeseed methyl ester (RME) with standard diesel fuel at 5% and 30% of biodiesel have been used for the current study, as well as pure RME.Hydraulic characterization of an 8-hole nozzle has been carried out using these three fuels, in order to explore and analyze the influence of fuel properties on mass flow rate and momentum flux at the nozzle exit. Additionally, spray visualization tests have been made in order to get information about spray cone angle, which allows the characterization of air-fuel mixing process. Finally, a theoretical derivation has been used to obtain further details of the microscopic characteristics of the spray and compare air-fuel mixing efficiency for the different biodiesel blends.

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Section: Introductionmentioning

confidence: 99%

Consequences of using biodiesel on the injection and air–fuel mixing processes in diesel engines

Salvador

Ruíz

Salavert

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The liquid sheet formed by impingement of two jets disintegrates in different ways depending on various parameters such as jet velocity, impingement angle, fluid properties, etc. The sprays formed by impinging jet injectors for Newtonian fluids have been studied extensively [2][3][4][5][6], however, the correlation and empirical equation obtained in these works cannot be directly used in gel propellant. The atomization characteristics of gel in impinging jet injectors were also studied by some researchers [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effects of orifice geometry on spray characteristics of impinging jet injectors for gelled propellants

Yang

Zhuang

2013

49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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1 This paper presents the results of an experimental study on breakup characteristics of gelled propellant liquid sheets formed by impinging jet injectors with different geometries of injector orifice (round, elliptic, and rectangular shape). Spray formation of gelled propellant from impinging jet injectors was described by carrying out experiments in a spray test facility. Considering the safety, a water based gel simulant was used instead of the gelled propellant in the experiments. The rheological characteristics of the gel simulant were tested. A high speed camera was used to grab the detailed information of the liquid sheet breakup process and spray development. The experiments were performed with injectors of different shape of injector orifice to test the geometrical effect of injector orifice on the spray characteristics. The experimental results showed that under the condition of identical sectional area, the shapes of liquid sheet formed by the impinging jet injectors with different shape of orifices were different. One special phenomenon is the thick liquid stream in the center of liquid sheet when the aspect ratio of rectangular orifice is great. The reason of this phenomenon is the axis-switching feature of the non-circular jets. The mass flow rates of square and elliptical orifices are larger than that of circular orifice. The flow rate of rectangular orifice becomes greater as the aspect ratio gets larger. The breakup length for injector with square orifice is shorter than that for injector with circular orifice. Although the elliptical jet behaves greater instability than circular jet, the liquid sheet breakup length of injector with elliptical orifice is not always shorter than that of injector with circular orifice. Generally, the breakup length of rectangular jet impinging injector increases with aspect ratio.

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“…They observed smaller breakup length in the hydraulic flip due to the fact that jet diameter was smaller than the orifice diameter. Jung et al 8 considered the breakup characteristics of liquid sheets formed by a like-doublet injection. They found that liquid-jet turbulence delays sheet breakup and shortens wavelengths of both ligaments and sheets.…”

Section: Introductionmentioning

confidence: 99%

Cavitation in an orifice flow

2007

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The purpose of this study is to identify the potential locations for cavitation induced by total stress on the flow of a liquid through an orifice of an atomizer. A numerical simulation of two-phase incompressible flow is conducted in an axisymmetric geometry of the orifice for Reynolds number between 100 and 2000. The orifice has a rounded upstream corner and a sharp downstream corner with length-to-diameter ratio between 1 and 5. The total stress including viscous stress and pressure has been calculated in the flow field and, from there, the maximum principal stress is found. The total-stress criterion for cavitation is applied to find the regions where cavitation is likely to occur and compared with those of the traditional pressure criterion. Results show that the viscous stress has significant effects on cavitation. The effect of geometry and occurrence of hydraulic flip in the orifice on the total stress is studied. The Navier-Stokes equations are solved numerically using a finitevolume method and a boundary-fitted orthogonal grid that comes from the streamlines and potential lines of an axisymmetric equipotential flow in the same geometry. A level-set formulation is used to track the interface and model the surface tension.

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Effects of Orifice Internal Flow on Breakup Characteristics of like-Doublet Injectors

Cited by 30 publications

References 10 publications

Consequences of using biodiesel on the injection and air–fuel mixing processes in diesel engines

Consequences of using biodiesel on the injection and air–fuel mixing processes in diesel engines

Effects of orifice geometry on spray characteristics of impinging jet injectors for gelled propellants

Cavitation in an orifice flow

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