The multidimensional interior ballistic two-phase flow and the chambrage problem.

The effect of the chamber geometry of tube weapons on the performance and on the interior ballistic two-phase flow is investigated by applying the 2-D model AMI. The axisymmetric formulation in AMI has been modified such that arbitrary chamber shapes can be considered without any simplifying assumptions. The numerical results for large caliber systems show interesting flow patterns caused by the axial changes in cross-section, e.g., by the transition cone or the igniter geometry. The numerical procedure is explained. Computational results emphasize the differences between a constant diamter chamber-bore configuration and a configuration with chambrage, i.e., with non-constant diameter. The effect of the chamber geometry of tube weapons on the performance and on the interior ballistic two-phase flow is investigated by applying the two- dimensional axisymmetric model of interior ballistics (AMI). The axisymmetric formulation in AMI has been modified such that arbitrary chamber shapes can be considered without any simplifying assumptions. The numerical results for large caliber systems show interesting flow patterns caused by the axial changes in cross section, e.g., by the transition cone or the ignitor geometry. The numerical procedure is explained. Computational results emphasize the differences between a constant-diameter chamber-bore configuration and a configuration with chambrage, i.e., with nonconstant diameter.