目的 通过优化气力输送系统中弯管的结构,从而降低弯管磨损的问题。方法 在弯管磨损中心切向处添加起旋装置,将弯管中的轴流输送转变为旋流输送。主管道轴线与起旋装置的中心轴线夹角为55°,保持弯管的气速为20 m/s,通过CFD-DEM,对比小麦颗粒在起旋装置气速分别为20、30、40 m/s时的流场特性。结果 基于CFD-DEM对弯管内部颗粒进行运动仿真,分别对比了2种装置的静压、迹线图、旋流强度、颗粒分布图等指标,发现导流叶片式的静压将与旋流强度均大于旋流管道式,螺旋效果更优。通过建立实验平台进行实验验证,实验结果与仿真结果相吻合。结论 导流叶片式更适合弯管输送,起旋效果明显,颗粒在弯管内分布均匀,整体呈螺旋前进,可以更有效地减少弯管与颗粒之间的磨损。
Abstract
The work aims to reduce the wear of the bending pipe by optimizing the structure of the bending pipe in the pneumatic conveying system. A swirling device was installed at the tangential position of the wear center of the bending pipe to transform the axial flow delivery in the bending pipe into a swirling flow delivery. The angle between the main pipe axis and the center axis of the swirling device was 55°, maintaining an airflow velocity in the bending pipe of 20 m/s. Through CFD-DEM, the flow field characteristics of wheat particles were compared at airflow velocities of 20, 30, and 40 m/s in the swirling device. Based on CFD-DEM, the motion simulation of particles in the bending pipe was conducted, comparing static pressure, trajectory diagrams, swirl intensity, particle distribution charts, etc., of the two devices. It was found that the static pressure of the guide blade type and the swirl intensity were both greater than that of the swirling pipeline type, indicating a superior spiral effect. An experimental platform was established for validation, and the experimental results were consistent with the simulation results. The guide blade type is more suitable for conveying in bending pipes, showing a significant vortex effect, with particles distributed evenly in the bending pipe and moving in a spiral manner, which can more effectively reduce the wear between the bending pipes and particles.
关键词
粮食颗粒 /
旋流输送 /
弯管磨损 /
CFD-DEM
Key words
grain particles /
swirl conveying /
wear of bending pipe /
CFD-DEM
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基金
国家“十四五”重点研发计划（2022YFD2100201）
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