摘要
为了探索叶片包角对低比转速离心泵固液两相流动的影响,采用Mixture多相流模型,利用CFX对4种不同叶片包角的低比转速离心泵进行了固液两相湍流数值模拟,分析了固液两相流中颗粒体积分布规律及速度变化规律。研究表明,在相同的泥沙含量条件下,随着叶片包角的增加,效率有所上升,叶片包角在φ=150°时效率达到最优;同时,随着叶片包角的增加,固体颗粒有从叶片工作面向叶片背面迁移的趋势,叶片工作面上的固体颗粒主要聚集在叶片高度的0.035 2处,叶片背面上的固体颗粒主要聚集在叶片出口处;随着包角的增大,叶轮内的固液两相速度差越来越小,流动更加均匀;叶片背面的固相速度在φ=160°、叶片高度为0.03时最大,为15.2m/s。
In order to explore the impact of blade envelope angle on the solid-liquid two-phase flow of centrifugal pump with low specific speed,based on Mixture multiphase flow model,CFX was used to simulate the solid-liquid twophase turbulence of low specific speed centrifugal pumps with four kinds of blade envelope angle.And then the distribution law and velocity variation of particle volume in solid-liquid two-phase flow was analyzed.The research shows that under the same sediment content,the efficiency increases with the increase of the wrap angle of the blade,and the optimal blade wrap angleφis 150°.At the same time,as the wrap angle of the blade increases,the solid particles have a tendency to migrate from the working surface of the blade to the back of the blade.The solid particles on the working surface of the blade mainly accumulate at the height of 0.035 2 of the blade.The solid particles on the back of the blade mainly concentrate at the outlet of the blade.As the wrap angle increases,the solid-liquid two-phase velocity difference in the impeller becomes smaller and smaller,and the flow is more uniform.The solid phase velocity at the back of the blade is the largest atφ=160°and the blade height is 0.03,which is 15.2 m/s.
作者
万丽佳
宋文武
李金琼
常方圆
张明祯
石乘帆
WAN Li-jia;SONG Wen-wu;LI Jin-qiong;CHANG Fang-yuan;ZHANG Ming-zhen;SHI Chen-fan(School of Energy and Power Engineering, Xihua University, Chengdu, Sichuan 610039, China)
出处
《水电能源科学》
北大核心
2019年第7期137-140,98,共5页
Water Resources and Power
基金
四川省科技厅项目(2016JY0187)
四川省教育厅重大培育项目(14CZ0013)
关键词
离心泵
固液两相
叶片包角
速度分布
颗粒体积分布
centrifugal pump
solid-liquid two-phase
blade envelope angle
velocity distribution
particle volume distribution
