Gasdynamics of combustion of TNT products in air

• Autorzy: Kuhl A. L. , Ferguson R. E. , Oppenheim A.K.
• Języki publikacji: EN

Abstrakty

EN

Effects of turbulent combustion induced by explosion of a 0.8-kg cylindrical charge ot TNT in a 17 m3 chamber filled with air, are investigated. The detonation wave in the charge transforms the solid explosiwe (TNT: C7H5N3O6) to gaseous products rich (`20% each) in carbon monoxide. The detonation pressure (`210 kb) thereby engendered causes the products to expand rapidly, driving a blast wave into the surrouding air. The interface between the products and air, being essentially unstable as a consequence of the strong acceleration inducted by the blast wave, evolves into a turbulent mixing layer - a process enhaced by shock reflections from the walls. Under such circumstances rapid combustion takes place where the expanded detonation products play the role of fuel. Its dynamic effect is manifested by the experimental measurement of ` 3 bar pressure increase in the chamber, in contrast to ` 1 bar attained by a corresponding TNT explosion in nitrogen. The experiments were modeled as turbulent combustion in an unmixed system at infinite Reynolds, Peclet and Damkohler numbers. The numerical solution was obtained by a high-order Godunov scheme using Adaptive Mesh Refinement to trace the turbulent mixing on the computational grid in as much detail as possible. The evolution of the calculared mass-fraction of fuel consumed by combustion began with a finite (non-zero) rate associated with strong initiation, followed by an exponential decay. Calculated pressures are in good agreement with measurements. The results thus reveal details of a combustion process that is controlled by fluid-mechanic transport in a higly turbulent field, in contrast to the conventional reaction-diffusion machanism of laminar flames.

• Wydawca: Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archivum Combustionis
• Rocznik: 1999
• Tom: Vol. 19 nr 1-4
• Strony: 67--89
• Opis fizyczny: Bibliogr. 90 poz., rys., tab.

Twórcy

autor

Kuhl A. L.

• Lawrence Livermore National Laboratory, Livermore, CA

autor

Ferguson R. E.

• Krispin Technologies Inc., Rockville, MD

autor

Oppenheim A.K.

• University of California, Berkeley, CA

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