关键词: 压力波, 两相流动, 数值模拟, 拟合坐标系

Abstract: Moving boundary problem can easily be solved with equations under the Lagrange Coordinate System for numerical computations of homogenous flow in interior ballistics. As the law for the persistence of continous lines or surfaces in Fluid Dynamics is untenable in the case of two-phase flow fields, equations for the two-phase flow model under the Lagrange Coordinate System cannot be established. This paper puts forward equations of the interior ballistic two-phase model with fitted coordinates and the relative numerical method adopting coordinate transformation and gives a numerical simulation of the pressure waves within a 30mm Naval Gun with 6/7 charge. The computed results are in good agreement with those experimentally obtained.

Key words: pressure wave, two- phase flow, numerical simulation, fitted coordinate system