基于CFD-DEM耦合的不同出口形式气力集排系统分配器仿真与试验

李贵川, 李海宇, 杨少鹏, 黄玉祥, 高筱钧, 付作立

Simulation and experiment of distributors of different outlet types of pneumatic collection and discharging systems based on CFD-DEM coupling

LI Guichuan, LI Haiyu, YANG Shaopeng, HUANG Yuxiang, GAO Xiaojun, FU Zuoli

Table 1 CFD-DEM simulation calculation parameters

Item Details Index Value CFD Materials Fluid/air Density/(kg·m-3) 1.225 Viscosity/(kg·m-1·s-1) 1.789×10-5 Boundary conditions Solid/PLA Density/(kg·m-3) 1 250 Velocity-inlet Velocity magnitude/(m·s-1) 28 Turbulence Turbulence intensity/% 4 Hydraulic diameter/mm 50 Flow-outlet Outlet type Flow-outlet Wall Wall motion Stationary wall Shear condition No slip DEM Materials (wheat seeds) Particle overall dimensions/mm 7.01×3.47×3.20 Thousand-grain weight/g 48.96 Water content/% 10.80 Poisson’s ratio 0.41 Shear modulus/Pa 4.79×107 Density/(kg·m-3) 1 350 wall Poisson’s ratio 0.35 Shear modulus/Pa 1.3×109 Density/(kg·m-3) 1 250 Interaction Particle-particle Coefficient of restitution 0.47 Coefficient of static friction 0.55 Coefficient of rolling friction 0.28 Interaction contact model Hertz-Mindlin Particle-wall Coefficient of restitution 0.50 Coefficient of static friction 0.22 Coefficient of rolling friction 0.16 Interaction contact model Hertz-Mindlin Particle Particle generation Particle radius/（mm×mm×mm） 7.00×3.20×3.20 Factory type Dynamic/unlimited number Generation rate/（s-1） 2 000