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Modélisation phénoménologique de pulvérisation de sprays couplée à une approche LES pour la phase gazeuse.

Abstract : Atomization of liquid is a very important mechanism for prediction of combustion in rocket or diesel engines. The subject of this study is to work on this kind of process. The aim is to develop models to describe physical phenomena involved in gas-assisted atomization. In this configuration, lots of parameters may be involved in liquid fragmentation like initial velocity of liquid or gas phase, density of each phase or surface tension for example ... This phenomenon is thus complex and exact resolution of each fragmentation process is very difficult. In this work, a stochastic approach is developed in order to model the several steps of gas-assisted atomization. This allows describing the primary atomization process and the statistics of non fragmented liquid near the injector. These statistics act as a map of fragmented liquid, and allow forming and following liquid fragments in the gas flow. This entails a description of the whole spray. The gas motion is solved with a Large Eddy Simulation approach, which account for the turbulence in the gas and instationnarity. This permits a Lagrangian transport of fragments formed during the primary phase of atomization. Collisions and resulting fragmentations or coalescences are also modelled by a stochastic approach, which accounts for the secondary step of atomization. All these different part allow then simulation of gas-assisted (and especially air-assisted in this study) atomization and computation of the liquid core intact length, of the spray angle, of the Sauter-mean Diameter and finally comparison of these results to experimental data.
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Contributor : Julien Jouanguy <>
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  • HAL Id : tel-00380980, version 1

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Julien Jouanguy. Modélisation phénoménologique de pulvérisation de sprays couplée à une approche LES pour la phase gazeuse.. Physique [physics]. Université de Rouen, 2007. Français. ⟨tel-00380980⟩

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