Cylinder Test: Homothetic Experiments of TATB-based Composition

摘要

In carbon rich explosive, the time scale (several microseconds) of soot growth and its dependence on local thermodynamic conditions may produce a difference of energy release during the expansion of detonation products of various size devices. We aim at testing this effect on TATB-based explosive. We have designed homothetic cylinder test (Φ=50, 20 and 10mm) with copper and aluminum liners. The PDV signal was recorded on opposite sides of the device, and the average Gurney energy was drawn along with the volume variation for each cylinder. We show a discrepancy of projection energy for the smaller cylinders compared to the larger ones. This lack of energy is ascribed to the difference in the carbon properties (cluster size, carbon phase) of the soot along the detonation products. This complex problem is approximated by an empirical kinetic evolution of the carbon phase transition in the detonation products. This model permits to reproduce the behavior (energy quenching) observed but need further exploration to reproduce the measures on both liners.