摘要
针对目前风选式米糠碎米分离装备存在耗能较高、碎米损失率较大等问题,对碎米的悬浮速度进行了试验测定.以不同粒径(1.0 mm、1.3 mm、1.5 mm、1.8 mm、2.0 mm)的碎米颗粒为实验对象,基于CFD-DEM耦合仿真试验,得到碎米的悬浮速度仿真值分别为4.93 m/s、5.99 m/s、6.98 m/s、7.95 m/s、8.5 m/s;通过台架试验得到碎米的悬浮速度分别为4.52 m/s、5.42 m/s、6.59 m/s、7.59 m/s、8.23 m/s,与仿真测量结果最大相对误差为10.5％,最小相对误差为3.3％.对仿真测量结果进行修正,得到仿真悬浮速度修正系数分别为0.92、0.90、0.94、0.95、0.97.研究结果可为风选式米糠碎米分离装备的机械设计与优化提供理论参考.
Abstract
Aiming at the problems of high energy consumption and high loss rate of broken rice,the suspen-sion velocity of broken rice was tested.Broken rice particles with different particle sizes(1.0 mm,1.3 mm,1.5 mm,1.8 mm,2.0 mm)were taken as experimental objects.Based on CFD-DEM coupling simulation test,the simulated suspension velocities of broken rice are 4.93 m/s,5.99 m/s,6.98 m/s,7.95 m/s and 8.5 m/s,respectively.The suspension velocities of broken rice are 4.52 m/s,5.42 m/s,6.59 m/s,7.59 m/s and 8.23 m/s,respectively.The maximum relative error is 10.5％and the minimum relative error is 3.3％.By modifying the simulation measurement results,the simulated suspension velocity correction coefficients are 0.92,0.90,0.94,0.95 and 0.97 respectively.The research results provide theoretical reference for the me-chanical design and optimization of air-separation equipment for rice bran and broken rice.
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