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Contribution à la Modélisation de la Combustion de Blocs de Propergol Solide Aluminisé après Eclatement d'un Propulseur

Abstract : The present work deals with one typical pyrotechnic safety issue. Its main objective is to predict the thermal effects induced by the combustion of aluminised solid propellant pieces which are dispered all around a blasted rocket motor.
A state of art about aluminised solid propellant combustion is made to improve our knowledge of the combustion mechanisms at micro-and macroscales. Large scale tests are set up in order to get new quantitative data for developing the numerical model. The comparison between two aluminised solid propellant compositions (4% or 20% of A1 in mass) show how important the role of burning A1 droplets is on heat transfer to the surroundings.
This tendancy is also pointed out by numerical tests using the Fire Dynamics Simulator (FDS). This software is modified to compute the dispersion of aluminium droplets by a lagrangian approach. It also includes a mixture fraction model with a vaporisation law to calculate the A1 droplet combustion, and the radiation of A1/A12O3 droplets is predicted by Mie theory. an optimized set of parameters is found and allows for getting numerical results in good agreements with the experimental ones. Finally it should be possible to simulate the whole scenario of an accidental rocket motor failure in a storage building.
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Submitted on : Thursday, June 26, 2008 - 3:03:19 PM
Last modification on : Monday, October 19, 2020 - 11:06:41 AM
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  • HAL Id : tel-00290814, version 1

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F. Chassagne. Contribution à la Modélisation de la Combustion de Blocs de Propergol Solide Aluminisé après Eclatement d'un Propulseur. Energie électrique. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2007. Français. ⟨tel-00290814⟩

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