Atomization Modelling of Liquid Jets Using a Two-Surface-Density Approach

Devassy, Bejoy Mandumpala; Habchi, C.; Daniel, Éric

doi:10.1615/atomizspr.2014011350

Cited by 22 publications

(18 citation statements)

References 33 publications

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“…Most of these effects are linked to the different dynamic behavior of these injector technologies, which affect the transient evolution of the needle lift, known to impact the internal flow and near-nozzle spray features in both diesel and gasoline direct injection systems [10][11][12]. Additionally, the internal geometry of the nozzle, and in particular of the discharge holes, is also critical in spray formation [13][14][15].…”

Section: Pinjmentioning

confidence: 99%

Computational investigation of diesel nozzle internal flow during the complete injection event

Salvador

Morena

Leon

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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Currently, diesel engines are calibrated using more and more complex multiple injection strategies. Under these conditions, the characteristics of the flow exiting the fuel injector are strongly affected by the transient interaction between the needle, the sac volume and the orifices, which are not yet clear. In the current paper, a methodology combining a 1D injector model and 3D-CFD simulations is proposed. First, the characteristics of the nozzle flow have been experimentally assessed in transient conditions by means of injection rate and momentum flux measurements. Later, the 3D-CFD modeling approach has been validated at steady-state fixed lift conditions. Finally, a previously developed 1D injector model has been used to extract the needle lift profiles and transient pressure boundary conditions used for the full-transient 3D-CFD simulations, using Adaptative Mesh Refinement (AMR) strategies to be able to simulate the complete injection rate starting from 1 micrometer lift.

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Section: Pinjmentioning

confidence: 99%

Computational investigation of diesel nozzle internal flow during the complete injection event

Salvador

Morena

Leon

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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“…Studying of droplets behavior in a high speed flow may also be encountered when security issues are considered as, for example, for shock wave attenuation (Chauvin et al [4,5]). Other applications can be found in explosive science or in combustion systems where a liquid jet is atomized (Welch and Boyle [52], Meng and Colonius [33], Devassy et al [7]). Detailed reviews on droplet breakup can be found in Pilch and Erdman [43], Wierzba and Takayama [53], Hsiang and Faeth [18].…”

Section: Introductionmentioning

confidence: 99%

A model and numerical method for compressible flows with capillary effects

Schmidmayer

Petitpas

Daniel

et al. 2017

Journal of Computational Physics

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A new model for interface problems with capillary effects in compressible fluids is presented together with a specific numerical method to treat capillary flows and pressure waves propagation. This new multiphase model is in agreement with physical principles of conservation and respects the second law of thermodynamics. A new numerical method is also proposed where the global system of equations is split into several submodels. Each submodel is hyperbolic or weakly hyperbolic and can be solved with an adequate numerical method. This method is tested and validated thanks to comparisons with analytical solutions (Laplace law) and with experimental results on droplet breakup induced by a shock wave.

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“…The main drawback of the two types of reduced-order models is due to their very different nature and the difficulty to couple both models in order to reach a predictive simulation of the whole process. Recent contributions in [12,33,34] have proposed a way to couple these two reduced-order models, but several issues are still wide open in order to increase the level of prediction one can reach with such a model coupling. We insist on the fact that the key issue is the ability of predicting the polydisperse character of the spray and the purpose of the present work is to use a recently introduced new hybrid high order size moment model [35] with the same level of accuracy as what has been done in [4,24,25,27,31,32], but with a much higher potential in terms of coupling with a diffuse interface model.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Mesh Refinement and High Order Geometrical Moment Method for the Simulation of Polydisperse Evaporating Sprays

Essadki

Chaisemartin

Massot

et al. 2016

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

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Predictive simulation of liquid fuel injection in automotive engines has become a major challenge for science and applications. The key issue in order to properly predict various combustion regimes and pollutant formation is to accurately describe the interaction between the carrier gaseous phase and the polydisperse evaporating spray produced through atomization. For this purpose, we rely on the EMSM (Eulerian Multi-Size Moment) Eulerian polydisperse model. It is based on a high order moment method in size, with a maximization of entropy technique in order to provide a smooth reconstruction of the distribution, derived from a Williams-Boltzmann mesoscopic model under the monokinetic assumption [O. ]. The present contribution relies on a major extension of this model [M. Essadki, S. de Chaisemartin, F. Laurent, A. Larat, M. Massot (2016) Submitted to SIAM J. Appl. Math.], with the aim of building a unified approach and coupling with a separated phases model describing the dynamics and atomization of the interface near the injector. The novelty is to be found in terms of modeling, numerical schemes and implementation. A new high order moment approach is introduced using fractional moments in surface, which can be related to geometrical quantities of the gas-liquid interface. We also provide a novel algorithm for an accurate resolution of the evaporation. Adaptive mesh refinement properly scaling on massively parallel architectures yields a precise integration of transport in physical space limiting both numerical dissipation as well as the memory trace of the solver. A series of test-cases is presented and analyzed, thus assessing the proposed approach and its parallel computational efficiency while evaluating its potential for complex applications. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Résumé -Raffinement de maillage adaptatif et méthode de moments géométriques d'ordre élevé pour la simulation des sprays en évaporation -La simulation prédictive de l'injection diphasique dans les chambres de combustion automobiles représente un enjeu majeur scientifique et applicatif. La description détaillée de l'interaction entre le brouillard de gouttes polydispersé produit par atomisation et l'écoulement gazeux est fondamentale pour prédire les régimes de combustion et la formation de polluant. Pour décrire la phase liquide, le modèle Eulérien polydisperse EMSM (Eulerian Multi-Size Moment) est choisi. Cette approche de type moments d'ordre élevé en taille avec reconstruction continue par maximisation d'entropie est construite à partir d'un modèle mésoscopique de Williams-Boltzmann sous l'hypothèse monocinétique [O. Emre (2014) PhD Thesis, ]. La présente contribution propose une extension majeure de ce modèle [M. Essadki, S. de Chaisemartin, F. Laurent, A. Larat, M. Massot (2016) Submitted to SIAM...

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Atomization Modelling of Liquid Jets Using a Two-Surface-Density Approach

Cited by 22 publications

References 33 publications

Computational investigation of diesel nozzle internal flow during the complete injection event

Computational investigation of diesel nozzle internal flow during the complete injection event

A model and numerical method for compressible flows with capillary effects

Adaptive Mesh Refinement and High Order Geometrical Moment Method for the Simulation of Polydisperse Evaporating Sprays

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