Computational studies of a Voitenko compressor
Computational studies of a Voitenko compressor Two successful shock tube experiments were recently performed at the Lawrence Livermore Laboratory. The experiments simulated the high enthalpy flow conditions that might arise in the nuclear blast encounter of a tunnel-based missile. The experiments, using a modified Voitenko high explosive generator, produced megabar pressure conditions at the inlet of the 2 cm-diameter air-filled shock tubes. Computer calculations have been done to model the 10/sup 5/-fold increase in air pressure in the Voitenko generator. These calculations are necessary to describe the source for the experiments and to permit better interpretation of the experimental data. A detailed understanding of the phenomenology of the compressor is also essential for optimization of future experiments, especially those involving scaling up to larger size shock tubes. An arbitrary Lagrange-Eulerian computer code was selected to calculate the late-time high explosive driven motion of a steel plate into the bell shaped compressor section. It was found that ordinary Lagrangian and Eulerian codes had difficulty in properly treating the steel-air interfaces, whereas an arbitrary Lagrange-Eulerian code was capable of modeling the complex flow of air past the steel interfaces in the compressor region. Using an improved equation of state for air, excellent agreement has been obtained in the more »
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