螺旋叶片对垂直螺旋输送机性能的影响

Influence of screw blade of performance for vertical screw conveyor

为了研究在垂直螺旋输送机物料输送过程中的细观甚至微观特征,降低颗粒输送过程中近轴处的涡流引起的能耗,增大近壁面处的轴向速度,考察不同母线形状的螺旋叶片,借助颗粒仿真软件EDEM 2.5进行数值试验,模拟垂直螺旋输送机内颗粒速度、功率消耗、能量耗散、质量流量等性能指标,通过数据处理软件Origin Pro 8.0作图分析各项指标的变化情况。结果表明:与传统直线型母线的螺旋叶片相比,弯曲型母线的螺旋叶片在近轴处的切向速度减小73.87%,大大降低近轴处的涡流效应;近壁面处的轴向速度在高转速时增大12.34%,完成预定输送任务基础上,有效地降低额外的能量消耗,提升整机性能。

In order to figure out the meso and microscopic characteristics during bulk material being conveyed within the vertical screw conveyor and reduce the swirl flow near the screw shaft and increase the axial velocity of particles near the wall during the particulate being conveyed, the different shape screw blades were surveyed, by means of the software of particle simulation EDEM 2.5, numerical test was done, the standards of performance such as particle velocity, power consumption,energy dissipation and average mass flow rate within the vertical screw conveyor were simulated. The trend charts were plotted based on the data processing software Origin Pro 8.0, to analysis the changes of indicators. The result shows that compared with the line type screw blade, the curved screw blade of tangential velocity near the shaft is reduce by 73.87%, the vortex motion decreases evidently. The axial velocity near the wall is increased by 12.34%, the extra energy dissipation effectively reduces on the basis of finishing the intended work, which promotes the whole performance of vertical screw conveyor