【摘要】 为了分析离心叶轮内固液流动特性,采用M ixture多相流模型,扩展的标准κε湍流方程与SIMPLEC算法,应用流体动力学软件Fluent对低比转速离心泵叶轮内固液两相湍流进行了数值模拟.分析了多种粒径及浓度条件下的固相体积浓度分布规律.当颗粒直径较小和泥沙浓度较低时,固粒在叶轮出口附近会出现向叶轮背面迁移的趋势;但在离心泵叶轮固液两相流动中,固体颗粒还是主要集中于叶轮工作面,因而会加剧叶轮工作面磨损破坏速度.数值结果表明,在相同的泥沙颗粒直径条件下,水泵扬程随着含沙水流中泥沙浓度的增大而下降.更多还原

【Abstract】 To study the flow characteristics of centrifugal rotor,solid-liquid two-phase turbulent flow in low-specific-speed centrifugal rotor is simulated by using Fluent software with mixture model,standard turbulence model and SIMPLEC algorithm.Distribution of volume fraction is analyzed for(different) solid particle diameters and sandy volume fractions.Near the exit of rotor,solid particles tend towards suction surface at the conditions of small particle diameter and low sandy volume fraction.However,solid particles are mainly concentrated on pressure surface,thus the wear of pressure surface will be (accelerated.) From simulation results it can be concluded that hydro head of impeller declines with the(increase) of volume fraction at the same particle diameter.centrifugal pump;low-specific-speed;solid-liquid two-phase turbulent flow;volume fraction;numerical simulation更多还原