JCZS2i: An Improved JCZ Database for EOS Calculations at High Temperature and Pressure

摘要

The Jacobs-Cowperthwaite-Zwisler-Sandia (JCZS) database has been used for over 15 years with the JCZ3 equation of state (EOS) to calculate detonation properties and product shock Hugoniots for a variety of explosives. The scope of the JCZS database has been increased by including species, and ions, that are currently used in the National Aeronautics and Space Administration (NASA) Lewis Research Center’s computer program CEA (Chemical Equilibrium with Applications). CEA uses an ideal gas EOS as opposed to a real gas EOS valid at high pressure and/or densities, such as the JCZ3-EOS that uses intermolecular potentials. We have also included piecewise fits for specific heat capacities (C_p) to insure reasonable extrapolations to temperatures as high as 20,000 K. The new library with the piecewise C_p fits and exponential 6 parameters have been implemented into the CTH-TIGER equilibrium code. The CTH-TIGER code is a chemical equilibrium solver coupled to our shock physics code, CTH. Predictions in the current work include detonation velocity for 59 explosives, water and air properties, and composition of an air shock created by detonation of Comp-B (60% RDX and 40% TNT).