矿浆输送泵内大颗粒运动轨迹及分布规律  

Motion Trajectory and Distribution Law of Large Particles in Slurry Pump

作　　者：李兵[1] 王献 李长江 刘厚林[2] 丁可金[1] 谈明高[2] LI Bing;WANG Xian;LI Changjiang;LIU Houlin;DING Kejin;TAN Minggao(Shanghai Marine Equipment Research Institute,Shanghai 200031,China;Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]上海船舶设备研究所,上海200031 [2]江苏大学流体机械工程技术研究中心,江苏镇江市212013

出　　处：《矿业研究与开发》2020年第2期138-144,共7页Mining Research and Development

基　　金：国家自然科学基金项目(51579117);江苏省自然科学基金项目(BK20161350)

摘　　要：为分析深海采矿矿浆泵输送大颗粒时易堵塞和磨损的问题,采用RNG k-ε湍流模型和离散相模型(DPM)模拟颗粒流动轨迹,研究了在叶轮和空间导叶内不同浓度和不同粒径的固体颗粒分布和运动轨迹,并详细分析了颗粒在叶片表面的分布情况以及颗粒物性参数对叶轮流道内湍动能的影响。研究结果表明,扬程和效率随粒径的增大而上升,升幅分别为2.9%和1.2%;扬程和效率随浓度的增大而下降,降幅分别为4.1%和1.5%。叶轮内颗粒体积分数最大出现在叶片压力面的出口边附近,最大值为输送浓度的8.65倍,并且颗粒随着粒径的增加出现向叶片吸力面偏移的趋势;浓度对颗粒的分布影响较小。导叶内颗粒体积分数最大出现在工作面中间靠后区域,且随着粒径和浓度的增大,颗粒与壁面碰撞次数增加,加剧导叶的磨损。粒径和浓度的增加可减少叶轮出口处的脱流损失,抑制了湍流涡的发展;但是浓度的增加会增加介质之间的摩擦损失。In order to analyze the problem of blockage and abrasion in deep-sea mining slurry pump conveying coarse particles,RNGk-εturbulence model and discrete phase model(DPM)were used to simulate the motion trajectory of particle.The distribution and movement of solid particles with different concentration and different particle size in impeller and spatial guide vane were studied.Besides,the distribution of solid particles on the blade surface and the effect of solid particles on the turbulent kinetic energy in the impeller were analyzed in detail.The results showed that,the head and efficiency respectively increased by 2.9% and 1.2% with the increase of particle diameter,while decreased by 4.1% and 1.5% with the increase of particle concentration.The maximum volume fraction of particles whose value was 8.65 times of the conveying concentration appearring near the exit edge of blade in impeller.With the increase of particle diameter,the particles tended to shift towards the suction surface of blade,and the concentration had little effect on the distribution of particles.The maximum volume fraction of particles in the guide vane appeared in the middle region of working face of the guide vane.With the increase of particle diameter and concentration,the number of collisions between particles and the wall increased,which aggravated the wear condition between particles and the wall.The increase of particle diameter and concentration can reduce the flow separation at the outlet of impeller and inhibit the development of turbulent eddies,but the increase of particle concentration can increase the friction loss between the media.

关 键 词：矿浆输送泵 数值模拟 固液两相流 离散相模型 颗粒分布 

分 类 号：TD857[矿业工程—金属矿开采]