As the core device of the deep-sea mining transport system, the slurry pump and its internal solid-liquid two-phase flow are extremely complicated; especially, the migration characteristics of particles have a great influence on the flow and wear of the pump. In order to grasp the particle motion law inside the slurry pump, this paper took into consideration the collision effects of the particles with particles and particles with walls and calculated the unsteady flow of the solid-liquid two-phase by CFD-DEM coupling algorithm. Then, the focus was put on the spatial distribution and movement characteristics of different particle diameters (namely, 5 mm, 10 mm, and 15 mm, while volume concentration Cv is constant 5%). The results show that the stratification phenomenon gradually disappears with the increase of particle diameter, and the intensity and scale of the vortex in the guide vane also increase obviously. Besides, as the particle diameter increases, the velocity changes more drastically, and the intensity and scale of the vortex increase significantly. Under low concentration conditions, the presence of particles has a limited influence on the hydraulic performance of the pump. By comparing with the experimental results, the simulation results are in good agreement with it, which proves that the CFD-DEM simulation in this paper is effective, and the conclusions can provide theoretical support for the design and analysis of the slurry pump in engineering application.

中文翻译：

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粒度对深海采矿渣浆泵流动特性的影响

作为深海采矿运输系统的核心设备，渣浆泵及其内部的固液两相流极为复杂。特别是，颗粒的迁移特性对泵的流量和磨损有很大的影响。为了掌握渣浆泵内部的颗粒运动规律，考虑了颗粒与颗粒以及壁之间颗粒的碰撞影响，并通过CFD-DEM耦合算法计算了固液两相的非稳态流动。然后，重点放在不同粒径（即5 mm，10 mm和15 mm，而体积浓度Cv为5％恒定）的空间分布和运动特性上。结果表明，随着粒径的增加，分层现象逐渐消失，导叶中涡旋的强度和尺度也明显增加。此外，随着粒径的增加，速度变化更大，涡旋的强度和尺度显着增加。在低浓度条件下，颗粒的存在对泵的液压性能影响有限。通过与实验结果的比较，仿真结果与实验结果吻合良好，证明了本文的CFD-DEM仿真是有效的，其结论可为工程应用中的渣浆泵的设计和分析提供理论支持。 。涡旋的强度和尺度显着增加。在低浓度条件下，颗粒的存在对泵的液压性能影响有限。通过与实验结果的比较，仿真结果与实验结果吻合良好，证明了本文的CFD-DEM仿真是有效的，其结论可为工程应用中的渣浆泵的设计和分析提供理论支持。 。涡旋的强度和尺度显着增加。在低浓度条件下，颗粒的存在对泵的液压性能影响有限。通过与实验结果的比较，仿真结果与实验结果吻合良好，证明了本文的CFD-DEM仿真是有效的，其结论可为工程应用中的渣浆泵的设计和分析提供理论支持。 。