Kinetic Modeling of Slow Energy Release in Non-Ideal Carbon Rich Explosives

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We present here the first self-consistent kinetic based model for long time-scale energy release in detonation waves in the non-ideal explosive LX-17. Non-ideal, insensitive carbon rich explosives, such as those based on TATB, are believed to have significant late-time slow release in energy. One proposed source of this energy is diffusion-limited growth of carbon clusters. In this paper we consider the late-time energy release problem in detonation waves using the thermochemical code CHEETAH linked to a multidimensional ALE hydrodynamics model. The linked CHEETAH-ALE model dimensional treats slowly reacting chemical species using kinetic rate laws, with chemical equilibrium assumed for species ... continued below

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Vitello, P; Fried, L; Glaesemann, K & Souers, C June 20, 2006.

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We present here the first self-consistent kinetic based model for long time-scale energy release in detonation waves in the non-ideal explosive LX-17. Non-ideal, insensitive carbon rich explosives, such as those based on TATB, are believed to have significant late-time slow release in energy. One proposed source of this energy is diffusion-limited growth of carbon clusters. In this paper we consider the late-time energy release problem in detonation waves using the thermochemical code CHEETAH linked to a multidimensional ALE hydrodynamics model. The linked CHEETAH-ALE model dimensional treats slowly reacting chemical species using kinetic rate laws, with chemical equilibrium assumed for species coupled via fast time-scale reactions. In the model presented here we include separate rate equations for the transformation of the un-reacted explosive to product gases and for the growth of a small particulate form of condensed graphite to a large particulate form. The small particulate graphite is assumed to be in chemical equilibrium with the gaseous species allowing for coupling between the instantaneous thermodynamic state and the production of graphite clusters. For the explosive burn rate a pressure dependent rate law was used. Low pressure freezing of the gas species mass fractions was also included to account for regions where the kinetic coupling rates become longer than the hydrodynamic time-scales. The model rate parameters were calibrated using cylinder and rate-stick experimental data. Excellent long time agreement and size effect results were achieved.

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PDF-file: 13 pages; size: 0.3 Mbytes

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  • Presented at: 13th International Detonation Symposium 2006, Norfolk, VA, United States, Jul 23 - Jul 28, 2006

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  • Report No.: UCRL-CONF-222314
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 897937
  • Archival Resource Key: ark:/67531/metadc880714

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  • June 20, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 29, 2016, 4:40 p.m.

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Vitello, P; Fried, L; Glaesemann, K & Souers, C. Kinetic Modeling of Slow Energy Release in Non-Ideal Carbon Rich Explosives, article, June 20, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc880714/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.