颗粒粒径对深海采矿矿浆泵性能的影响

Effect of Particle Size on Performance of Slurry Pump in Deep Sea Mining

为掌握矿浆泵内部颗粒的运动规律,考虑颗粒的体积效应和相内碰撞效应,应用CFD-DEM耦合算法,对扬矿模型泵内的粗颗粒-海水两相流实施了双向耦合非定常流动计算,分析了不同粒径的颗粒在矿浆泵内的空间分布和运动特征。研究结果表明:采用两相耦合的求解方式可以较好地模拟矿浆泵内的两相流场特性;流动域内颗粒浓度略高于管线平均值,叶轮和导叶内颗粒与流体呈现明显的分层运动,小颗粒获取的能量高于大颗粒,颗粒的存在增加了局部漩涡和相内损耗。计算结果与试验结果吻合较好,证明本文计算方法有效,研究结论可为深海矿浆泵的高效无堵塞设计和分析提供理论支撑。

In order to understand the movement rule of particles in the slurry pump,two⁃phase coupling of the unsteady flow of coarse particles and seawater in the lifting pump model was calculated by using the CFD⁃DEM coupling algorithm in consideration of volume effect of particles and collision effect in the phase.The spatial distribution and movement characteristics of the particles with different particle sizes in the pump were analyzed.The results show that the solution method with two⁃phase coupling can simulate the two⁃phase flow field in the slurry pump.The particle concentration in the flow domain is slightly higher than the average value along the pipeline.The motion of particles in the stratified fluid in the impeller and guide blade can be obviously observed.The energy obtained by small particles is higher than that of large particles,and the presence of particles increases the local vortices and phase losses.The calculation results are in good agreement with the test results,proving that the calculation method adopted in this paper is effective.The research results can provide theoretical support for the design and analysis of deep⁃sea slurry pump with high⁃efficiency and non⁃clogging characteristics.