(1. 中南大学 机电工程学院，长沙 410083；
2. 深海矿产资源开发与利用技术国家重点实验室，长沙 410012；
3. 中南大学 深圳研究院，深圳 518057)
摘 要: 深海扬矿电泵是深海采矿提升系统的重要设备，其形式为多级离心泵，负责将含有粗颗粒的矿浆提升至水面。其内部流动为复杂的粗颗粒-海水二相流，通过普通的试验难以观测内部流动特征。通过CFD-DEM耦合模拟仿真，获得了深海扬矿电泵在超过额定浓度、输送极端大颗粒、偏移额定流量以及电力故障矿浆回流时的泵内流动特征。开展了清水和矿浆试验，验证了仿真的正确性。泵在流量偏离50%，矿浆浓度超过额定值100%，当颗粒直径超过最大粒径100%时仍旧具有良好的输送和一定的回流性能。
关键字: CFD-DEM耦合；深海扬矿电泵；极端工况；回流堵塞
（1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology, Changsha 410012, China;
3. Shenzhen Research Institute of Central South University, Shenzhen 518057, China）
Abstract:The deep-sea mining lifting pump is a vital equipment in the deep-sea mining system, whose form is a multi-stage centrifugal pump, which is responsible for lifting the slurry containing coarse particles to the water surface. The internal flow in pump is the complex coarse-seawater two-phase flow, and it is difficult to observe the internal flow characteristics through ordinary tests. Through CFD-DEM coupling simulation, the flow characteristics in the deep-sea lifting electric pump are obtained when the pump is conveying thicker slurry or slurry with extremely big particles, and working under unrated flow rate or when electrical system failed. Experiments with clean water and slurry were carried out to verify the correctness of the simulation. The pump still has good conveying and reflux performance when the flow deviation is 50%, the particle concentration exceeds 100% than the rated one, and the maximum particle size exceeds 100%.
Key words: coupled CFD-DEM simulation; deep-sea mining pump; extreme operating condition; reflux blockage
