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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Thesis/dissertation |
Document Type: | Book |
All Authors / Contributors: |
Zakaria Bouali; Julien Reveillon, chercheur en physique eÌnergeÌtique).; Université de Rouen Normandie.; Complexe de recherche interprofessionnel en aérothermochimie (Saint-Etienne-du-Rouvray, Seine-Maritime / 1967-....).; École doctorale sciences physiques mathématiques et de l'information pour l'ingénieur (Saint-Etienne-du-Rouvray, Seine-Maritime / ....-2016). |
OCLC Number: | 800835711 |
Description: | 1 vol. (222 p.) ; 30 cm. |
Responsibility: | Zakaria Bouali ; sous la direction de Julien Réveillon. |
Abstract:
This thesis discusses the influence of spray evaporation in the autoignition process. This research topic is a key component of the Industrial Systems Framework such as diesel engines and similar processes based on turbulent combustion initiated by autoignition of a fuel / air mixture prepared by injection of a liquid fuel. We used a Direct Numerical Simulation (DNS) code in which the gas phase is solved by an Eulerian approach, while the dispersed liquid phase is modelled by a Lagrangian approach. To account for autoignition complex phenomena, a skeletal chemical kinetic is directly resolved. In the first part of this work, the influence of gas and liquid properties on the autoignition delay was studied. On several configurations (homogeneous and heterogeneous reactors, homogeneous isotropic turbulence), comparisons between diphasic autoignition and purely gaseous autoignition highlight the impact of the evaporating spray. The emphasis is on the location of the moist reactive zone and the existence of a strong correlation between regions of low scalar dissipation and the most favourable autoignition sites. In the second part, a tabulated chemistry model FPI (Flame of Prolongation LMDL) based on the closure of reaction rates from tabulated species mass fractions was implemented to evaluate the ability to reproduce results obtained by the complex chemistry approach. Comparisons with the resolved complex chemistry were performed on homogeneous and turbulent cases with the presence of droplets. It turns out that the presence of an evaporating spray strongly modifies the chemistry evolution process making it difficult to use "a priori" tabulations.
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