为研究颗粒体积分数对天然气水合物多相混输泵内流特性的影响，基于ANSYS CFX软件采用非均相模型和particle模型，选用甲烷水合物颗粒体积分数为5%、10%、15%和20%的海水为介质，对多相混输泵流场进行数值模拟。结果表明：当颗粒体积分数较低时多相混输泵叶轮和导叶内旋涡较小，但随着颗粒体积分数的增加多相混输泵叶轮和导叶内轴向旋涡逐渐增大；在叶轮流道内颗粒分布较为均匀，而随着颗粒体积分数的增加，导叶内较大的旋涡影响导致颗粒在导叶内出现明显的聚集现象，在导叶叶片表面颗粒主要聚集在吸力面前半部分，其分布区域远大于压力面，即导叶吸力面更易受到磨损；随着颗粒体积分数的增加，多相混输泵的扬程和效率均逐渐降低。

In order to investigate the effect of particle volume fraction on internal flow characteristics of natural gas hydrate multiphase mixed pump,the brine with the methane hydrate particle volume fraction of 5%,10%,15% and 20% was selected as medium,the inhomogeneous phase model and particle model were adopted to numerically simulate the flow field of multiphase mixed pump based on ANSYSCFX software.The results show that when the volume fraction of the particle is low,the vortex in the impeller and guide vane of the multiphase mixed pump is smaller.But with the increase of the volume fraction of the particle,the axial vortex in the impeller and guide vane of the multiphase mixed pump increases gradually.In the impeller flow channel,the particle distribution is relatively uniform,with the increase of the volume fraction of the particle,due to the effect of the larger vortex in the guide vane,the particles appear obvious aggregation in the guide vane.On the surface of guide vane,the particles mainly gather on the first half part of suction surface,and its distribution area is much larger than the pressure surface,so the suction surface of the guide vane is more susceptible to wear.At the same time,with the increase of the volume fraction of particle,the head and efficiency of the multiphase mixed pump will decrease gradually.

TG974.1

国家重点研发计划（2018YFB0905200）;中国博士后科学基金特别资助(2017T100077);中国博士后科学基金面上资助(2016M600090);四川省教育厅科研项目资助（重点项目）(17ZA0366)