Multi-shock and isentropic compression of the tri-amino-tri-nitro-benzene based explosive PBX 9502: Evaluation of reactive flow models

摘要

We explore reactive flow models of the tri-amino-tri-nitro-benzene (TATB) based explosive PBX 9502 (95% TATB, 5% Kel-F 800) as they pertain to both isentropic compression experiments on the Sandia Z-machine and multi-shock compression experi- ments performed on the LANL 2-stage light gas gun. In both sets of experiments, pressures above 20 GPa show very little reaction, whereas these pressures would normally induce a rapid transition to detonation if reached within a single shock. The phenomena of shock desensitization or low entropy generated through multiple shocks can both explain this observed phenomena, although with different physical interpretations. We will specifically explore the reactive flow models CREST, Wescott-Setwart-Davis (WSD), WSD with desensitization and Ignition and Growth. It will be shown that models with reaction rates based mostly on local pressure predict detonation under many of these experimental condi- tions, while models with reaction based on the entropy of the reactants or shock state have higher fidelity to the experimental results. In addition to these multi-shock experiments, two (nearly) isentropic compression experiments have also been completed and those de- tailed results and comparisons with reactive flow models are also presented.