The strong-jet/weak-jet problem: new experiments and CFD

Yimer, Ibrahim; Becker, H. A.; Grandmaison, E. W.

doi:10.1016/s0010-2180(00)00216-9

Cited by 15 publications

(11 citation statements)

References 19 publications

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“…Figure 5(a) and 5(b) shows the centerline location of the weaker jet in cases where the strong jet does not bend. The results are compared with the experimental results of Yimer et al 11 Figure 5(c) and 5(d) consider equal-momentum (twin) jets, so the deviations are symmetrical. Apparently, the Bending Model can predict the centerline location of dual-hole jets properly for a wide range of momentum ratios, injection angles and nozzle–nozzle spacings.…”

Section: Resultsmentioning

confidence: 93%

“…The interaction of converging circular air jets for large injection angles (30-120°) for the application of mixing vessels was investigated by Rajaratnam and Khan. 10 The flow structure and trajectories of the jets in a strong/weak dual-hole circular jet were studied by Yimer et al 11 As a result of their study, the merging point between the strong jet and the weak jet is a strong function of the linear and angular separations between the jets and their momentum ratio at the exit. 11 The analytical solution of single jets has been well studied in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…10 The flow structure and trajectories of the jets in a strong/weak dual-hole circular jet were studied by Yimer et al 11 As a result of their study, the merging point between the strong jet and the weak jet is a strong function of the linear and angular separations between the jets and their momentum ratio at the exit. 11 The analytical solution of single jets has been well studied in the literature. Schlichting 12 presented the analytical solutions for individual plane and circular jets.…”

Section: Introductionmentioning

confidence: 99%

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A phenomenological model of two circular turbulent jets

Faghani

Rogak

2012

International Journal of Engine Research

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A semi-analytical model for the interaction of twin circular jets is developed, requiring the solution of a second-order differential equation for the momentum balance. This model ('Bending Model') can predict the trajectory and the attachment of two jets. Using Reichardt's hypothesis, the three-dimensional velocity field of dual-hole circular jets can be predicted. The model is used to predict the interaction of converging, diverging, parallel and non-equal jets. The results show encouraging agreement with k-e numerical simulations and experimental results from the literature. The position of the maximum velocity is predicted to within 5%, and the model can predict the velocity field as well as the k-e model. The current model can be useful in phenomenological engine simulation of multi-hole injectors.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A phenomenological model of two circular turbulent jets

Faghani

Rogak

2012

International Journal of Engine Research

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“…Several studies have been published on the structure of nonreacting multiple jets (Becker and Booth, 1975;Krothapalli et al, 1980;Pani and Dash, 1983;Raghunatan and Reid, 1980;Tanaka and Nakata, 1975;Yimer et al, 1996Yimer et al, , 2001. However, the studies on reacting multiple jets are mostly limited, for example, flame developing in still air without confinement (Leite et al, 1996) or in a wind tunnel with cross-flow (Menon and Gollahali, 1988).…”

Section: Introductionmentioning

confidence: 99%

Oxy-Combustion Properties of Interacting Separated Jets

Sautet

Boushaki

Salentey

et al. 2006

Combustion Science and Technology

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The use of oxy-combustion in separated-jet burners opens interesting possibilities in pollutant and flame control, and has very important impacts on flame stability. An experimental study of the combustion characteristics and flame structures has been conducted on a simplified version of a separated-jet burner that includes a central natural gas jet surrounded by two pure-oxygen jets. The flame stability and its structural properties are analyzed by the chemiluminescence of OH. Liftoff positions, flame front, flame length, and the concentrations of CO 2 , CO, O 2 and NOx have been measured. The effects of jet exit velocities, jet diameters and separation distance between jets on flame characteristics have been examined. The results quantify the increase of central jet velocity and the distance between the jets makes possible to control and reduce appreciably the NOx emission. The liftoff height and the flame length depend strongly on the spacing between the jets and the jet exit velocities. The flame front spreads noticeably with the distance between the jets; however, the effect of jet exit velocities is lower, especially if the distance between the jets is high.

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“…Most of these studies have predicted the location of the merging and the combining points. Twin jets are also required for noise reduction (Tadamoto et al, 1995;Yimer and Grandmaison, 2001;Boopathi et al, 2015;Bhat, 1978).…”

mentioning

confidence: 99%

Effect of a Weak Jet on a Strong Jet

Louaifi-Hamaili

Mataoui

Aksouh

2019

JAFM

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This paper investigates the influence of a weak-jet on the development of a turbulent axisymmetric strong jet. A parametric study is carried out to evaluate simultaneously the effect to the jets-spacing (S/D=3 and S/D=7.5) and their velocity ratios in range 0≤λ≤1. The mixing phenomenon is studied numerically by the finite volume method using the 3D-RANS second-order model, which gives a good agreement with the available data. Three distinct regions of this type of jets interaction are evidenced. This study confirms that the jets spacing affects strongly the converging region and has a minor effect on the combining region. It is found that the weak jet attracts the strong jet and the combining region extends from 30D to 40D where the self-similarity of a single jet is obtained. The jet width decreases when velocity ratio and jets spacing augment. In the combining region, in comparison with the free jet, it is found that the addition of a weak-jet increases the decay rate of the centerline velocity.

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The strong-jet/weak-jet problem: new experiments and CFD

Cited by 15 publications

References 19 publications

A phenomenological model of two circular turbulent jets

A phenomenological model of two circular turbulent jets

Oxy-Combustion Properties of Interacting Separated Jets

Effect of a Weak Jet on a Strong Jet

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