基于气固耦合散粮旋流输送弯管流场特性研究

Field Flow Characteristics of Grain Particle Swirl Conveying Bend Based on Gas-solid Coupling

中文关键词: 粮食颗粒  弯管磨损  起旋装置  CFD-DEM

英文关键词: grain particle  bend wear  rotation device  CFD-DEM

中文摘要:

      目的 降低粮食颗粒输送中对弯管的磨损程度。方法 引入旋流输送，设计一种侧向补气起旋装置。侧向起旋装置中心轴线与主管道中心轴线的夹角分别为45°、55°、65°，主管道多相流速度固定为20 m/s，侧向起旋装置气流速度分别为20、30、40 m/s。基于散粮气力输送试验平台结合Fluent软件进行分析，采用CFD-DEM对粮食颗粒在弯管内输送情况进行仿真，并对比压降、颗粒分布、螺旋迹线等指标。结果 发现侧起旋装置与主管道夹角为55°，侧起旋装置气流速度为30 m/s时，颗粒螺旋前进，明显减小与管壁的磨损，输送效果最优，经试验验证，与仿真结果一致。结论 文中设计的装置明显降低了粮食颗粒输送中对弯管的磨损，运输效果良好。

英文摘要:

      The work aims to reduce the bend wear in the transportation of grain particles. Swirling conveying was introduced and a lateral air supplement rotation device was designed. The angle between the central axis of the lateral rotation device and the central axis of the main pipeline was 45°, 55°, and 65°, respectively. The multiphase flow velocity of the main pipeline was fixed at 20 m/s, and the airflow velocity of the lateral rotation device was 20, 30 and 40 m/s. CFD-DEM was used to simulate the transportation of grain particles in a bend, and indicators such as pressure drop, particle distribution, and spiral traces were compared. When the angle between the side rotation device and the main pipeline was 55°, and the airflow speed of the lateral rotation device was 30 m/s, the particles showed spiral forward, significantly reducing the wear on the pipe wall, and the transportation effect is the best. After experimental verification, it was consistent with the simulation results. The device designed in this paper can obviously reduce the wear on the bend during grain conveying, and has good transportation effect.