基于离散元方法的RDX-Al颗粒混合数值模拟分析

摘要

基于离散元方法,以旋转筒内RDX-Al二元颗粒体系的搅拌过程为研究对象进行模拟.采用离散元软件(EDEM),首先研究RDX-Al二元颗粒各自随转速的变化趋势,并进一步得出二元颗粒变化率的特点,做出分布上的拟合,得出最吻合模拟试验的函数为指数函数.然后,将旋转筒细分为多个单元空间,考察旋转轴与单元空间之间的距离对二元颗粒混合效果的影响.结果表明:单元空间离旋转轴越远,即旋转半径越大,颗粒之间的变化率也就越快,越容易达到均匀状态.最后,考察加入抄板的影响,结果表明:RDX-Al二元颗粒趋于的稳定值分别发生了改变.%Stirring process of RDX-Al particles in rotating cylinder was simulated based on discrete element method.Discrete element method and related software ( EDEM) was used.Trends of RDX particle or Al particle changing with rotation rate was studied at first.Change rate of the binary granular mixture and the fitting on the distribution could be obtained.Exponential function is the most suitable function.Then, the rotating cylinder was divided into multiple unit spaces.Effect of distance between rotation axis and unit space on mixture of the two kinds of particles was researched. Results show that the greater the distance ( rotation radius) , the faster the change rate between particles, the more evenly the mixture.Influence of copy board on the particle mixture in different situations was also tested.The change of number of particles in the whole rotating cylinder was estimated in the same way, and stable value of RDX-Al particles has been changed.