Multi-Dimensional Interior Ballastics Computations on Wear and Erosion Mechanisms in Gun Barrels

摘要

Numerical simulations and theoretical analyses have been applied to identify and assess the dominant mechanisms leading to gun barrel wall erosion. The turbulent erosive flow fields, characterizing the interior environments, are currently simulated with two dimensional, time dependent numerical approximations to the unsteady Navier--Stokes equations, augmented by turbulence models at the turbulence kinetic energy and dissipation rate closure level. The wall erosion region description includes chemically reactive polyphase turbulent boundary layer, gas-surface thermal-mechanical-chemical interactions, surface layer composition changes and subsurface solid response modeling. Some current results are discussed including: sensitivity of erosion to turbulence levels, gas borne particulates and their distributions, surface microscopic transport and chemical kinetics processes, and macroscopic solid coating thermal-mechanical response. (ERA citation 04:024159)