深海扬矿泵磨损特性的两相流数值模拟预测

Deep-sea mining pump wear prediction using two-phase flow numerical simulation

针对深海扬矿泵的磨损问题,采用Euler-Lagrange两相流模型对泵内流场进行模拟,并与试验结果进行对比,以验证仿真模型的准确性.采用专业旋转机械造型软件BladeGen对叶轮和导叶造型.基于CFX流体分析软件,应用Finnie磨损模型研究深海扬矿泵在不同的流量、转速以及输送不同颗粒体积分数下过流部件的磨损速率,并获得泵内流场颗粒轨迹分布图.结果表明:随着流量的增大,扬矿泵叶轮过流部件的磨损速率增大,但导叶过流部件的磨损速率变化并不明显.这是导叶式渣浆泵与蜗壳式渣浆泵的不同之处.当转速或颗粒体积分数提高时,叶轮和导叶过流部件的磨损速率迅速增大;与导叶相比,叶轮过流部件的磨损速率明显更大,其中叶轮压力面磨损最为严重.根据等寿命设计原则,叶轮过流部件应选用更耐磨损的材料.

In view of the wear problem of deep-sea mining pump,Euler-Lagrange two-phase flow model was applied to simulate the solid-liquid two-phase turbulent flow field inside the pump,and the accuracy of simulation model was verified by comparison with the experimental results.A professional rotary mechanical modeling software BladeGen was employed to generate the models of impellers and guide vanes.Based on the fluid analysis software CFX,Finnie wear model was utilized to predict the wear rate of the hydraulic components of deep-sea mining pump at different flow rates,rotational speeds and particle volume fractions,and the particle trajectory distribution in the pump flow field was obtained.The results show that the wear rate of the impeller increases with the increase of the flow rate,however,the wear rate of guide vanes does not vary significantly.This is a distinct part between vane type slurry pump and volute type slurry pump.As the rotation speed or particle volume fraction increases,the wear rate of impeller and guide vanes rapidly increases.The wear rate of the impeller is higher than that of the guide vane,and the pressure surface of the blade is most seriously worn.Accor-ding to the design principle of equal life,impeller should be made by more wear-resistant material.