Effects of Confinement on Combustion of TNT Explosion Products in Air

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Turbulent combustion fields established by detonative explosions of TNT in confinements of different sizes are studied by high-resolution numerical simulation, using AMR (Adaptive Mesh Refinement) method. The chambers are filled with nitrogen or air at NPT conditions. In the second case, the detonation products, rich in C and CO, act, upon turbulent mixing with air, as fuel in an exothermic process of combustion, manifested by a distinct pressure rise. It is the evolution in space and time of this dynamic process that formed the principal focus of this study. Our results demonstrate a dominating influence of the size of the ... continued below

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620 Kilobytes pages

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Kuhl, A.L.; Oppenheim, A.K.; Ferguson, R.E.; Reichenback, H. & Neuwald, P. February 5, 2000.

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Turbulent combustion fields established by detonative explosions of TNT in confinements of different sizes are studied by high-resolution numerical simulation, using AMR (Adaptive Mesh Refinement) method. The chambers are filled with nitrogen or air at NPT conditions. In the second case, the detonation products, rich in C and CO, act, upon turbulent mixing with air, as fuel in an exothermic process of combustion, manifested by a distinct pressure rise. It is the evolution in space and time of this dynamic process that formed the principal focus of this study. Our results demonstrate a dominating influence of the size of the enclosure on the burning rate--an effect that cannot be expressed in terms of the classical burning speed. Under such circumstances, combustion is of considerable significance, since it is associated with a calorific value (''heat release'') of an order of 3500 Cal/gm, as compared to 1100 Cal/gm of TNT detonation. The numerical simulations provide considerable insight into the evolution of combustion fields dominated by shock-turbulence interactions. Fuel consumption histories, extracted from the simulations, reveal the dynamic features of the system, represented by the rate of combustion (akin to velocity) and its change (akin to acceleration). Time profiles of the mass fraction consumed fuel are expressed, with a remarkable accuracy, by bi-parametric life functions, whereby the trajectories of these parameters, obtained by differentiation, can be evaluated with precision commensurate with their commanding role in the identification of the dynamic nature of the system.

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620 Kilobytes pages

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  • 28th International Symposium on Combustion, Edinburgh (GB), 07/30/2000--08/04/2000

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  • Report No.: UCRL-JC-137418
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 793989
  • Archival Resource Key: ark:/67531/metadc742597

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  • February 5, 2000

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  • Oct. 19, 2015, 7:39 p.m.

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  • May 6, 2016, 1:14 p.m.

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Kuhl, A.L.; Oppenheim, A.K.; Ferguson, R.E.; Reichenback, H. & Neuwald, P. Effects of Confinement on Combustion of TNT Explosion Products in Air, article, February 5, 2000; California. (digital.library.unt.edu/ark:/67531/metadc742597/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.