3D Large Scale Simulation of the High-Speed Liquid Jet Atomization

Bianchi, Gian Marco; Minelli, Fabio; Scardovelli, Ruben; Zaleski, Stephan

doi:10.4271/2007-01-0244

Cited by 35 publications

(27 citation statements)

References 31 publications

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“…As a result, the minimum droplet size that could be predicted was $50 lm, which is far from the size of the droplets of automotive sprays. Bianchi et al (2005) performed similar 3-D VOF-LES simulations of the liquid jet atomisation using smaller cell sizes of 8 lm and in a more recent study, Bianchi et al (2007), the minimum cell size has been reduced down to 4 lm. The numerical code used employs however structured meshes, which is the main reason for not being able to use finer grids able to resolve smaller structures near the atomisation region.…”

Section: Nomenclaturementioning

confidence: 89%

Modelling of high-pressure dense diesel sprays with adaptive local grid refinement

Tonini

Gavaises

Theodorakakos³

2008

International Journal of Heat and Fluid Flow

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Section: Nomenclaturementioning

confidence: 89%

Modelling of high-pressure dense diesel sprays with adaptive local grid refinement

Tonini

Gavaises

Theodorakakos³

2008

International Journal of Heat and Fluid Flow

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“…This approach has been used by Bianchi et al (2007), who are also interested by the flow inside the nozzle which can influence the processes of atomization. In the case of high-pressure injectors, cavitation can occur in the nozzle and changes the rest of the spray, Peng Karrholm et al (2007) has worked on this phenomenon and has performed some calculations in order to model cavitation, with LES.…”

Section: Les; Liquid Fuel Is Pure Eulerianmentioning

confidence: 99%

Spray Atomization Models in Engine Applications, from Correlations to Direct Numerical Simulations

Santos

Moyne

2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Résumé -Modèles de spray dans les applications moteur, des corrélations aux simulations numériques directes -Les sprays sont parmi les principaux facteurs de qualité, dans la formation du mélange et la combustion, dans un grand nombre de moteurs (à combustion interne). Ils sont de toute première importance dans la formation de polluants et l'efficacité énergétique, bien qu'une modélisation adéquate soit encore en développement. Pour un grand nombre d'applications, la validation et la calibration de ces modèles demeurent une question ouverte. Aussi, présentons-nous un aperçu des modèles existants et proposons quelques voies d'amélioration. Les modèles sont classés en nondimensionnels et dimensionnels allant de formules simples dédiées à des applications proches du temps réel à des descriptions détaillées des premiers stades de l'atomisation. Abstract -Spray Atomization Models in Engine Applications

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“…Simulations have shown that the CHEMKIN-LES version gives results that better match the experimental data than the CHEMKIN-RANS version because LES is capable of representing fuel-air mixing and flow structure more accurately than RANS. Bianchi et al (2007) investigated the effect of nozzle flow conditions on liquid jet atomization using a three-dimensional LES. They showed that the final stage of atomization is the ligament formation.…”

Section: Introductionmentioning

confidence: 99%

Large-eddy simulation of air entrainment during diesel spray combustion with multi-dimensional CFD

Azimov

Kim

2011

Int.J Automot. Technol.

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Large-Eddy Simulation (LES) was used to perform computations of air entrainment and mixing during diesel spray combustion. The results of this simulation were compared with those of Reynolds Averaged Navier Stokes (RANS) simulations and an experiment. The effect of LES on non-vaporizing and vaporizing sprays was evaluated. The validity of the grid size used for the LES analysis was confirmed by determining the subgrid-scale (SGS) filter threshold on the turbulent energy spectrum plot, which separates a resolved range from a modeled one. The results showed that more air was entrained into the jet with decreasing ambient gas temperatures. The mass of the evaporated fuel increased with increasing ambient gas temperatures, as did the mixture fraction variance, showing a greater spread in the profile at an ambient gas temperature of 920 K than at 820 K. Flame lift-off length sensitivity was analyzed based on the location of the flame temperature iso-line. The results showed that for the flame temperature iso-line of 2000 o C, the computed lift-off length values in RANS matched the experimental values well, whereas in LES, the computed lift-off length was slightly underpredicted. The apparent heat release rate (AHRR) computed by the LES approach showed good agreement with the experiment, and it provided an accurate prediction of the ignition delay; however, the ignition delay computed by the RANS was underpredicted. Finally, the relationships between the entrained air quantity and mixture fraction distribution as well as soot formation in the jet were observed. As more air was entrained into the jet, the amount of air-fuel premixing that occurred prior to the initial combustion zone increased, upstream of the lift-off length, and therefore, the soot formation downstream of the flame decreased.

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3D Large Scale Simulation of the High-Speed Liquid Jet Atomization

Cited by 35 publications

References 31 publications

Modelling of high-pressure dense diesel sprays with adaptive local grid refinement

Modelling of high-pressure dense diesel sprays with adaptive local grid refinement

Spray Atomization Models in Engine Applications, from Correlations to Direct Numerical Simulations

Large-eddy simulation of air entrainment during diesel spray combustion with multi-dimensional CFD

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