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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
International Journal for Multiscale Computational Engineering
Импакт фактор: 1.016 5-летний Импакт фактор: 1.194 SJR: 0.452 SNIP: 0.68 CiteScore™: 1.18

ISSN Печать: 1543-1649
ISSN Онлайн: 1940-4352

Выпуски:
Том 17, 2019 Том 16, 2018 Том 15, 2017 Том 14, 2016 Том 13, 2015 Том 12, 2014 Том 11, 2013 Том 10, 2012 Том 9, 2011 Том 8, 2010 Том 7, 2009 Том 6, 2008 Том 5, 2007 Том 4, 2006 Том 3, 2005 Том 2, 2004 Том 1, 2003

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v8.i5.70
pages 523-533

Numerical Modeling of Dielectric Breakdown in Solid Propellant Microstructures

Stany Gallier
SNPE Materiaux Energetiques, Vert-le-Petit, France

Краткое описание

This study addresses the industrial issue of dielectric breakdown in aluminized solid propellants. Direct simulations at the microscale level are performed by considering monodisperse hard sphere systems obtained by a packing algorithm. Steady Maxwell equations are solved using a finite differences technique, and breakdown dynamics is modeled by a quasi-steady succession of local breakdowns between particles. Validations of the numerical procedure are successfully carried out on the prediction of the effective electrical conductivity of random suspensions of spheres. Computations of the breakdown field for monodisperse random dispersions accurately match some experimental data as well as an existing mixture law based on the mean nearest-neighbor distance. This mixture law is then applied to four industrial propellants, for which realistic microstructures have been generated and breakdown experimental are data available. It appears that this law is reasonably accurate to predict the breakdown strength of real solid propellants.

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