摘要
Abstract
Upon primer ignite the firing charge,the combustion gases propel gunpowder particles through controlled axial propulsion.The sloping chamber,which is a gradual shrinkage section between the chamber and the barrel bore,will inevitably be subjected to the irregular collision of the gunpowder particles,resulting in localized erosive wear.In the initial ballistic stage,with high chamber pressure,fast particle velocity and large particle size,the erosive wear caused by the impact of gunpowder particles on the sloped chamber is more prominent.In order to focus on this collision damage effect,according to the characteristics of particle motion,collision and gas-solid two-phase flow in the initial ballistic phase,a three-dimensional unsteady gas-solid two-phase flow model was established based on the Euler-Lagrange approach,using the computational fluid dynamics-discrete element method(CFD-DEM)coupled method.Numerical simulation of the erosion and wear of the gunpowder particles on the sloped chamber of a 155 mm artillery was carried out.The results show that the erosive wear in the starting section of the sloping chamber is significant and has an annular distribution,while the erosive wear in the rest of the area is minor and has an irregular cloud-like distribution.The mass loss of the sloping chamber increases exponentially with time.When the taper of the sloping chamber is increased from 1/10 to 1/5,the mass loss of the sloping chamber increases with the increase of taper,and the larger the taper is,the larger the rate of mass loss is.关键词
冲蚀磨损/气固两相流/火药颗粒/CFD-DEM方法Key words
erosive wear/gas-solid two-phase flow/gunpowder particles/CFD-DEM method分类
军事科技
