Quantitative Product Gas Distribution at large volume expansions on the C-J isentrope

Common reaction products equations of state (EOS) such as Jones-Wilkins-Lee (JWL) do not explicitly include chemistry effects, which have important consequences for detonation, including hot spot formation and evolution, expansion kinetics and overdriven performance. . Reactive flow models incorporating a thermochemical code, e.g., CHEETAH, enable realistic kinetic modeling of subscale effects by calculating product species and their concentrations. In principle, this approach allows the user to cover many different experimental conditions and geometries, including cylinder detonation, shock initiation, shock desensitization, corner turning, etc. , but it requires a broad range of experimental data for testing and validation. Chemistry-explicit models are constrained using the measured heat of detonation and final products concentrations (detonation calorimetry) for determination of "freeze-out" temperatures, inference of gas and solid phase compositions, and to refine or validate product EOS. Final products information has been limited to historical data acquired decades ago on a limited set of explosives. We have recently collected and analyzed quantitatively gas samples at the end of the detonation calorimeter test. The data will reduce uncertainty in gas product compositions and inferred solid composition at large volume expansions for existing and future high explosive formulations. This work will present the methodology utilized for this quantitative determination.