Impact of Particle Sizes on Flow Characteristics of Slurry Pump for Deep-Sea Mining
Impact of Particle Sizes on Flow Characteristics of Slurry Pump for Deep-Sea Mining
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DOI：
10.1155/2021/6684944
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发表时间：
2021-03
影响因子：
1.6
通讯作者：
Runkun Wang;Yingjie Guan;Xing Jin;Zhipeng Tang;Zuchao Zhu;X. Su
中科院分区：
文献类型：
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作者：
Runkun Wang;Yingjie Guan;Xing Jin;Zhipeng Tang;Zuchao Zhu;X. Su
泥浆泵作为深海采矿运输系统的核心设备，其内部固液两相流动极其复杂，尤其是颗粒的运动特性对泵的流动和磨损有很大的影响。为了掌握渣浆泵内颗粒的运动规律，本文考虑了颗粒与颗粒、颗粒与壁面的碰撞效应，采用CFD-DEM耦合算法对固液两相非定常流动进行了数值模拟。然后，重点研究了不同颗粒直径(即5 mm、10 mm、15 mm，体积浓度CV为5%)的空间分布和运动特性。结果表明，随着颗粒直径的增大，分层现象逐渐消失，导叶内旋涡的强度和尺度也明显增大。此外，随着颗粒直径的增大，速度变化更加剧烈，旋涡的强度和尺度显著增大。在低浓度条件下，颗粒的存在对泵的水力性能影响有限。通过与实验结果的对比，模拟结果与实验结果吻合较好，证明了本文CFD-DEM模拟的有效性，所得结论可为工程应用中渣浆泵的设计和分析提供理论支持。
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.