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Simulation Numérique Directe de la combustion turbulente diphasique: Application à l'étude de la propagation et de la structure des flammes

Abstract : This work is devoted to the study of the propagation and the structure of two-phases turbulent
flames. To this end, Direct Numerical Simulations (DNS) are used. First, numerical systems for two-phases flow simulations is presented along with a specific chemical model. Then, a study of laminar spray flames is carried out. An analytical study related to the dynamics of evaporation of droplets is first proposed where the influence on the equivalence ratio of the ratio between the heating delay of the droplet and the evaporation delay is detailed. The simulation of a propagating flame through a cloud of droplets is carried out and a pulsating behavior is highlighted. A study of these flames according to the topology of liquid fuel enabled us to caracterize a double flame structure composed of a premixed flame and a diffusion flame. Our last study is devoted to spray turbulent flames. Two-phase combustion of turbulent jets has been simulated. By varying the spray injection parameters (density, equivalence ratio), a database has been generated. This database allowed us to describe local and global flame regimes appearing in the combustion of sprays. They have been categorized in four main structures : open and closed external regime, group combustion and mixed combustion. Eventually, a combustion diagram has been developed. It involves the spray vaporization time, the mean inter-space between droplets or group of droplets and eventually the injected equivalence ratio.
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https://tel.archives-ouvertes.fr/tel-00006820
Contributor : Karine Cannevère <>
Submitted on : Monday, September 6, 2004 - 2:20:00 PM
Last modification on : Tuesday, February 5, 2019 - 11:44:12 AM
Long-term archiving on: : Friday, April 2, 2010 - 9:09:21 PM

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  • HAL Id : tel-00006820, version 1

Citation

Karine Cannevière. Simulation Numérique Directe de la combustion turbulente diphasique: Application à l'étude de la propagation et de la structure des flammes. Modélisation et simulation. INSA de Rouen, 2003. Français. ⟨tel-00006820⟩

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