Oblique Interaction of Detonation with Inert Material Confinement: The Effect on the Reaction Zone

摘要

A study is presented of the oblique interaction of both a step shock in unreacted explosive and a resolved reaction zone detonation with a rigid wedge. Two condensed- phase detonation models are considered: 1) a polytropic EOS model (Aslam-Bdzil- Stewart (ABS)) and 2) a simple JWL EOS-based model (Ignition & Growth (IG)). For the non-reactive polytropic model, we find good agreement between shock-polar theory and direct numerical simulation (DNS) results, for all wedge angles. For the nonreactive Ignition & Growth model, shock-polar theory agrees with DNS results only for the case of larger wedge angles. For smaller wedge angles, a non-classical curved Mach reflection is observed, reminiscent of von Neumann Mach reflection [5], which does not agree with three-shock polar theory. For small to moderate wedge angles, our resolved reaction zone detonation simulations show very curved Mach stems (and no obvious slip line) for both models. The strong influence that the explosives’ heat-release rate has on streamline curvature, explains the difference between the nonreactive and resolved reaction zone model results.