关键词: 增黏硬质颗粒, 喷射速度, 扩散角度, 气固两相流仿真, 颗粒运动特征

Abstract: To study the effects of hard particle parameters on sanding jetting behavior of train adhesion enhancing, the visual detection technology was used to conduct jetting behavior tests with different particle sizes, shapes and densities. The influence weights of various factors on jetting velocity and diffusion angle were analyzed, and the movement characteristics and influencing mechanism of particles inside sanding device were explored. The results show that with the increase in the particle sizes and densities, the jetting velocity and diffusion angle gradually decrease. The diffusion angle of irregular particles is generally greater than that of circular particles. The weight of the significant influencing factors on jetting velocity(from the largest to the smallest) is: size, density. The significant influence factor weight of diffusion angle(from the largest to the smallest) is: shape, size. The particle size and density are directly proportional to the gas-solid coupling forces they are subjected to, and inversely proportional to the initial particle acceleration. Irregular particles have a higher number of collisions than those of circular particles. According to the changing law of coupling forces and kinetic energy, the particle motion characteristics are divided into two stages: acceleration and stability. At the initial moment, the particle acceleration determines the amount of kinetic energy that the particles may achieve in the stable stage.

Key words:  , adhesion enhancing particle, jetting velocity, diffusion angle, gas-solid two-phase flow simulation, particle motion characteristic