Développement d'un modèle de transfert radiatif 3D adapté au calcul de la signature d'un jet de moteur-fusée dans l'ultraviolet

Abstract : The aim of this Thesis is to model the "Solar Blind" ultraviolet radiation emitted by a rocket plume loaded with an aluminized composite solid fuel. The ultraviolet radiation comes from chemiluminescence emission of gaseous species and from absorption and scattering of alumina particles. In order to take into account scattering, which causes coupling between radiation propagation directions, a 3D radiative transfer model is used: the Spherical Harmonics Discrete Ordinate Method (SHDOM). Spherical Harmonics allow a faster computation of scattering integral than in a classical discrete ordinate method, while radiative transfer equation is integrated along discrete ordinates. SHDOM model, initially developed for clouds, is adapted to rocket plume characteristics such as composition and geometry. Chemiluminescence emission, which mainly comes from CO + O radiative recombination, is evaluated using experimental data from literature. Particles optical properties are evaluated by taking into account their sizes and complex refractive index. These data are estimated from literature results. Test cases are performed in cylindrical media close to rocket plumes in order to show the influence of particles extinction and scattering on the signature. Finally, comparisons are carried out between calculated and measured signatures.
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Theses
Physics. Université de Rouen, 2002. French
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https://tel.archives-ouvertes.fr/tel-00003328
Contributor : Pierre-Emmanuel Baudoux <>
Submitted on : Tuesday, September 9, 2003 - 11:15:48 AM
Last modification on : Wednesday, October 29, 2014 - 1:24:20 PM

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Pierre-Emmanuel Baudoux. Développement d'un modèle de transfert radiatif 3D adapté au calcul de la signature d'un jet de moteur-fusée dans l'ultraviolet. Physics. Université de Rouen, 2002. French. <tel-00003328>

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