摘要
为研究叶轮时序角度对扬矿泵内固液两相流动的影响,对两级扬矿泵全流场采用CFD-DEM法进行数值计算,并设计了0°、30°和60°三组叶轮时序方案,分析了叶轮时序效应对扬矿泵外特性、颗粒运动特性、颗粒速度分布、颗粒碰撞特性、磨损分布以及内流机理。结果表明:随着时序角度的增加,扬矿泵外特性最大增幅为1.7%,颗粒平均速度最大增幅为1.91%,颗粒速度的提升增强了颗粒的流动性,从而减缓了泵内颗粒的堵塞情况;时序角度的增加能够减少泵内颗粒的碰撞次数,总碰撞次数最大降幅为5.01%;改变时序角度,泵内总磨损最大降幅为6.45%,且叶轮叶片、导叶叶片和导叶前盖板的磨损量最大降幅分别为12.15%、8.08%和8.06%。通过综合分析不同时序角度下扬矿泵的内流性能,发现时序效应能够优化次级叶轮内颗粒体积分数分布,可降低部分流域的高颗粒体积分数区域面积,从而改善泵内流动条件。
In order to study the influence of impeller clocking angle on the solid-liquid two-phase flow in the lifting pump,the entire flow field of the two-stage lifting pump was numerically calculated by CFD-DEM method,and three impeller clocking schemes of 0°,30°and 60°were designed.The impeller clocking effect on the external characteristics,particle motion characteristics,particle velocity distribution,particle collision characteristics,wear distribution and internal flow mechanism of the lifting pump were analyzed.The results show that with the increase of the clocking angle,the maximum increase in the external characteristics of the lifting pump is 1.7%,and the maximum increase of the particle average speed is 1.91%.The increase in particle speed enhances particle mobility,so as to slow down the blockage of particles in the pump.Increasing of clocking angle can reduce the number of particle collisions in the pump,and the maximum reduction of the total number of collisions is 5.01%.Changing the clocking angle,the maximum reduction in total wear in the pump is 6.45%,and the maximum wear reduction of impeller blades,guide vane blades and front shroud of guide vane are 12.15%,8.08%and 8.06%,respectively.By comprehensively analyzing the internal flow performance of the lifting pump under different clocking angles,it is found that the clocking effect can optimize the particle volume fraction distribution in the secondary impeller,reduce the area of high particle volume fraction in some drainage basins,and improve the flow conditions in the pump.
作者
谈明高
蒋耀涵
吴贤芳
刘厚林
马皓晨
吴登昊
TAN Minggao;JIANG Yaohan;WU Xianfang;LIU Houlin;MA Haochen;WU Denghao(Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,China;College of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China;College of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China;College of Metrology and Testing Engineering,China Jiliang University,Hangzhou 310027,China)
出处
《中国有色金属学报》
北大核心
2025年第3期1017-1029,共13页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51979124)。
关键词
扬矿泵
固液两相流
时序效应
叶轮
lifting pump
solid-liquid two-phase flow
clocking effect
impeller
