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Atomization and Sprays
Facteur d'impact: 1.262 Facteur d'impact sur 5 ans: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2015011204
pages 189-254

EULERIAN MOMENT METHODS FOR AUTOMOTIVE SPRAYS

O. Emre
IFP Energies nouvelles, 1,4 av. Bois Preau, 92852 Rueil-Malmaison, France, Institut Carnot IFPEN Transports Energie; CNRS UPR288, Laboratoire EM2C, 92295 Chatenay-Malabry, France; Ecole Centrale Paris, 92295 Chatenay-Malabry, France
D. Kah
IFP Energies nouvelles, 1,4 av. Bois Preau, 92852 Rueil-Malmaison, France, Institut Carnot IFPEN Transports Energie; CNRS UPR288, Laboratoire EM2C, 92295 Chatenay-Malabry, France; Ecole Centrale Paris, 92295 Chatenay-Malabry, France
Stephane Jay
IFP Energies nouvelles, 1,4 av. Bois Preau, 92852 Rueil-Malmaison, France, Institut Carnot IFPEN Transports Energie
Q.-H. Tran
IFP Energies nouvelles, 1,4 av. Bois Preau, 92852 Rueil-Malmaison, France, Institut Carnot IFPEN Transports Energie
A. Velghe
IFP Energies nouvelles, 1,4 av. Bois Preau, 92852 Rueil-Malmaison, France, Institut Carnot IFPEN Transports Energie
S. de Chaisemartin
IFP Energies nouvelles, 1,4 av. Bois Preau, 92852 Rueil-Malmaison, France, Institut Carnot IFPEN Transports Energie
R. O. Fox
CNRS UPR288, Laboratoire EM2C, 92295 Chatenay-Malabry, France; Ecole Centrale Paris, 92295 Chatenay-Malabry, France
F. Laurent
CNRS UPR288, Laboratoire EM2C, 92295 Chatenay-Malabry, France; Ecole Centrale Paris, 92295 Chatenay-Malabry, France; Federation mathematique de l'Ecole Centrale Paris−FR CNRS 3487, France
M. Massot
CNRS UPR288, Laboratoire EM2C, 92295 Chatenay-Malabry, France; Ecole Centrale Paris, 92295 Chatenay-Malabry, France; Federation mathematique de l'Ecole Centrale Paris−FR CNRS 3487, France

RÉSUMÉ

To assist industrial engine design, 3D simulations are increasingly used as they allow evaluation of a wide range of engine configurations and operating conditions and bring a comprehension of the underlying physics complementary to experiments. While the gaseous flow description has reached a certain level of maturity, the multiphase flow description involving the liquid jet fuel injected into the chamber still faces some major challenges. There is a pressing need for a spray model that is time efficient and accurately describes the fuel-particle cloud dynamics downstream of the injector, which is an essential prerequisite for predictive combustion simulations. Due to the highly unsteady nature of the flow following the high-pressure injection process and the complexity of the flow regimes from separated/dense compressible phases to fully developed turbulent spray with evaporating droplets, Eulerian-Eulerian descriptions of two-phase flows are seen as very promising approaches towards realistic and predictive simulations of the mixing process. However, they require some effort in terms of physical modeling and numerical analysis related to the more complex mathematical structure of the system of equations and to the unclosed terms appearing in space/time-average equations. Among the various challenges faced, one critical aspect is to capture spray polydispersity in this framework. A review of recent developments that have permitted key advances in the spray modeling community is proposed in this paper. It is divided into four parts. First, an introduction to automotive spray modeling is provided. Then the formalisms for the description of the disperse region of an engine spray are presented with particular emphasis on the pros and cons of classical Lagrangian particle methods versus Eulerian approaches. The third part presents the motivation for and the recent developments of Eulerian high-order moment methods for size polydispersion. Finally, the extension to fully two-way coupled interactions with the gas phase and the implementation of such methods for variable-geometry applications in CFD codes is described in the fourth part. Using realistic direct injection conditions computed with the IFP-C3D solver, the application and efficiency of Eulerian approaches is illustrated.


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