摘要
为深入了解多级离心泵叶轮和导叶内部固液两相流动状态,基于ANSYS CFX软件,结合双流体模型,计算了额定工况下,固相体积分数分别为0%和20%、固液两相密度比为1.468时,两级离心泵内部三维非稳态固液两相流动.结果表明:固相的加入会降低多级泵的出口压力,固相的存在对于液相流场具有一定影响;流场中固体颗粒的分布与其所在流场区域有相应关系,在叶轮中,叶片进口处压力面与吸力面均有较高固相体积分数,叶片出口处吸力面固相体积分数高于压力面;在导叶中,正导叶进出口固相体积分数较高,正导叶正面固相的运动速度和体积分数均明显高于背面;叶轮进出口和导叶进口局部磨损较为明显.研究固体颗粒的运动规律对于固液两相流泵的设计具有一定参考价值.
To further understand the flowage structure of solid-liquid two-phase flow in impeller and guide vanes of the multistage centrifugal pump,3D nonsteady solid-liquid two-phase flow inside the two-stage centrifugal pump,with particle volume fraction of 0% and 20%,density ratio between solid and liquid of 1. 468 at design point was simulated by using Euler-Euler two-fluid model based on ANSYS CFX. The results indicate that the addition of particles decreases the pressure at the outlet of the pump and it also has an influence on liquid phase flow to some extent. There are some relations between the distribution of particles in flow field and the location in the pump. In the impeller,the higher solid volume fraction exists on pressure and suction surfaces of the inlet,the solid volume fraction on the suction surface is higher than that on the pressure surface in the outlet. In the guide vane,the higher solid volume fraction exists at the inlet and outlet of positive guide vane. The particle velocity and solid volume fraction on the front surface of positive guide vane were obviously higher than that on the back surface. The wear of flow components caused by particles occurs at the inlet and outlet of the impeller and the inlet of guide vane. Research on the characteristics of particles＇ motion contributes to thedesign of the solid-liquid pump to a degree.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2017年第8期652-658,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
江苏省自然科学基金资助项目(BK20131256)
江苏高校优势学科建设工程项目
关键词
多级离心泵
固液两相流
叶轮
径向导叶
数值计算
multistage centrifugal pump
solid-liquid two-phase flow
impeller
radial guide vane
numerical calculation
