Abstract Centrifugal pumps are indispensable in aquaculture engineering. The existence of bubbles is inevitable in a centrifugal pump and may affect the performance of the pump which delivers solid-liquid two-phase flow. Thus, this study aims to analyze the effects of gas-phase properties on the internal characteristics of a centrifugal pump by using a computational fluid dynamic code based on Eulerian multiphase mode and a standard k–e two-equation turbulence model. Results show that gas-phase properties, such as concentration and diameter, affect the absolute pressure and the phase distribution in the centrifugal pump. The gas-phase distribution on the working faces of blades is greater than forces on the back face of the blades. The larger the diameter of the gas-phase is, the easier it is to be concentrated; Thus, the working face of the blades is prone to cavitation and corrosion, and with the increase of the bubble size, the cavitation corrosion of the back surface of the impeller becomes more serious. The solid-phase velocity and static pressure distribution increase with increasing concentration or diameter of gas-phase. The solid-phase is more easily leave the impeller area and enter the volute because of the existence of gas-phase, which may lead to abrasion of volute. The existence of gas makes the solid velocity distribution in the centrifugal pump more uneven, which may cause uneven wear of the centrifugal pump. The obtained results by this method can reveal the effects of gas-phase properties and wear on the internal characteristics in centrifugal pumps and are helpful for improvement and empirical correction in the hydraulic design of centrifugal pumps.

中文翻译：

---

气相特性对离心泵内部特性及磨损影响的数值分析

摘要 离心泵在水产养殖工程中是必不可少的。气泡的存在在离心泵中是不可避免的，它可能会影响输送固液两相流的泵的性能。因此，本研究旨在通过使用基于欧拉多相模式和标准 k-e 两方程湍流模型的计算流体动力学代码来分析气相特性对离心泵内部特性的影响。结果表明，气相特性，如浓度和直径，会影响离心泵中的绝对压力和相分布。叶片工作面上的气相分布大于叶片背面的作用力。气相直径越大，越容易浓缩；因此，叶片的工作面容易产生气蚀和腐蚀，随着气泡尺寸的增大，叶轮后表面的气蚀现象更加严重。固相速度和静压分布随着气相浓度或直径的增加而增加。由于气相的存在，固相更容易离开叶轮区域进入蜗壳，可能导致蜗壳磨损。气体的存在使离心泵内的固体速度分布更加不均匀，可能造成离心泵的不均匀磨损。