Blockage of the Deep-Sea Mining Pump Transporting Large Particles with Different Sphericity

被引:5
|
作者
Teng, Shuang [1 ]
Kang, Can [1 ]
Li, Ming-hui [1 ]
Qiao, Jin-yu [2 ]
Ding, Ke-jin [3 ]
机构
[1] Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Peoples R China
[2] Zibo Prod Qual Testing Res Inst, Zibo 255063, Peoples R China
[3] Shanghai Marine Equipment Res Inst, Shanghai 200031, Peoples R China
关键词
deep-sea mining pump; particle sphericity; velocity triangle; force angle; particle trajectory; blockage; SIMULATION; SHAPE; WEAR; VELOCITY; 2-FLUID; EROSION; MODEL;
D O I
10.1007/s13344-023-0028-0
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The present study aims to plumb blockage of the deep-sea mining pump transporting large particles with different shapes. A numerical work was performed through combining the computational fluid dynamics (CFD) technique and the discrete element method (DEM). Six particle shapes with sphericity ranging from 0.67 to 1.0 were selected. A velocity triangle is built with the absolute, relative, and circumferential velocities of particles. Velocity triangles with absolute velocity angles ranging from 90 degrees to 180 degrees prevail in the first-stage impeller. With declining sphericity, more particles follow the velocity triangle with absolute velocity angles ranging from 0 degrees to 90 degrees, which weakens the ability of particles to pass through the flow passage. Furthermore, the forces acting on the particles traveling in the impeller passage are analyzed. Large particles, especially non-spherical ones, suffer from high centrifugal force and therefore move along the suction surface of the impeller blades. Non-spherical particles undergo great drag force as a result of large surface area. The distribution of drag force angles is featured by two peaks, and one vanishes due to blockage. As particle sphericity declines, both magnitude and angle of the pressure gradient force decrease. Variation of the drag force and the pressure gradient force causes clockwise deflection of the centripetal force, resulting in deflection and elongation of particle trajectory, which increases the possibility of blockage.
引用
收藏
页码:343 / 352
页数:10
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