Development of flow from multiple‐jet burners

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

doi:10.1002/cjce.5450740605

Cited by 27 publications

(24 citation statements)

References 7 publications

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“…Contrary to the investigation by Yimer et al (1996) there was no entrainment of ambient air from the sides in this setup as the perforated plate was extended all the way to the walls of the wind tunnel. Therefore the merging of the multiple jets, still present in this configuration, is due to jet spreading rather than the deflection of jets towards the center.…”

Section: 3mentioning

confidence: 57%

“…Jet convergences have also been shown in a multiple round jet configuration by Yimer et al (1996) who studied a multi-jet burner with a ring of either four or six jets surrounding a central port. The result showed that the outer jets curve towards the center jet, while merging with each other and the jet in the center.…”

Section: 3mentioning

confidence: 88%

“…The result showed that the outer jets curve towards the center jet, while merging with each other and the jet in the center. Yimer et al (1996) concluded that this overall contraction is a result of the entrainment action of each jet, which draws in fluid from its surroundings and therefore produces suction on its neighbors.…”

Section: 3mentioning

confidence: 99%

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Experimental and Numerical Investigations of Confluent Round Jets

Svensson¹

2015

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Unconfined multiple interacting confluent round jets are interesting from a purely scientific point of view, as interaction between neighboring jets brings additional complexity to the flow field. Unconfined confluent round jets also exist in various engineering applications, such as ventilation supply devices, sewage disposal systems, combustion burners, chemical mixing or chimney stacks. Even so, little scientific attention has been paid to unconfined confluent round jets, and detailed investigations on the complete three-dimensional turbulent flow field of confluent jet configurations issuing into an unconfined stagnant environment are scarce.The present work uses both advanced measurement techniques and computational models to provide deeper understanding of the turbulent flow field development of unconfined confluent round jets. Both Laser Doppler Anemometry (LDA) and Particle Image Velocimetry (PIV) have been used to measure mean velocity and turbulence properties within two setups, consisting of a single row of 1×6 jets and a square in-line array of 6×6 confluent jets. LDA was used for measurements very close to the nozzle inlets and to verify the main findings made with PIV. A comparison between LDA and PIV results showed that the two measurement techniques produced results that are in good agreement with each other.Simulations using Computational Fluid Dynamics (CFD) of the 6×6 setup were conducted using three different Reynolds Averaged Navier-Stokes (RANS) turbulence models: the standard k-ε, the RNG k-ε and the Reynolds Stress Model (RSM). The results from the CFD simulations were compared with the experimental PIV data. The employed RANS turbulence models were all capable of accurately predicting mean velocities and turbulent properties in the investigated confluent jet array. In general the RSM and the standard k-ε model provided smaller deviations between numerical and experimental results than the RNG k-ε model. In terms of mean velocity the second-order closure model (RSM) was not found to be superior to the less complex standard k-ε model.The validated CFD results provide data at all locations in the solution domain and the computational results were used to further analyze the investigated confluent jet array. The validated CFD model was also employed in a parametrical investigation, including five independent variables: inlet velocity, nozzle diameter, nozzle edge-toedge spacing, nozzle height and the number of jets in the array. The parametrical investigations made use of statistical methods in the form of Response Surface Methodology and Box-Behnken Design of Experiments. The derived response surface models provided information on the principal influence and relative importance of the investigated parameters within the design limits.ii The positions of the jets within the array strongly influence both mean velocity and turbulence. In all investigated setups the jets experience merging and combining. Square arrays also include considerable jet convergence, which was not present in th...

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Section: 3mentioning

confidence: 57%

Section: 3mentioning

confidence: 88%

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Experimental and Numerical Investigations of Confluent Round Jets

Svensson¹

2015

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“…Several studies have been published on the structure and development of non-reacting multiple jets [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Predictive analysis of combined burner parameter effects on oxy-fuel flames

Boushaki¹,

Guessasma²,

Sautet³

2011

Applied Thermal Engineering

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The present paper aims at studying the influence of burner parameters with a separated jet configuration, namely nozzles diameters and separation distance between the jets, on the flame characteristics (lift-off positions of flame and flame length). The experimental layout considers the use of OH-chemilumenescence to measure the flame characteristics for different combinations of processing conditions. The predictive analysis is based on a neural computation that considers the correlations between the inputs and the outputs of a combustion system using a configuration of separated jet. The predictive analysis show that a good agreement is found between numerical and experimental results in the case where the predictions are within the process window. The exploration of other process parameter combinations beyond that window gives less convincing results. This is mainly attributed to the fact that steady state characteristics are predicted numerically whereas it is expected experimentally that some of burner parameter combinations can lead to an increase of the parameters characterizing the flame.

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“…Further analysis of multiple jets has been conducted in research related to combustion or chemical mixing (Tatsumi et al, 2010;Yimer et al, 1996). Yimer et al (1996) studied multiple jet burners with a central (fuel) jet surrounded by a ring of either four or six (air) jets and found that the jets from the outer nozzles curve towards the centerline of the array while merging with each other and the center jet.…”

Section: Multiple Jetsmentioning

confidence: 99%

Near-Field Study of Multiple Interacting Jets : Confluent Jets

Ghahremanian¹

2015

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Development of flow from multiple‐jet burners

Cited by 27 publications

References 7 publications

Experimental and Numerical Investigations of Confluent Round Jets

Experimental and Numerical Investigations of Confluent Round Jets

Predictive analysis of combined burner parameter effects on oxy-fuel flames

Near-Field Study of Multiple Interacting Jets : Confluent Jets

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