Rotodynamic multiphase pumps are usually equipped with many compression units to provide sufficient boosting pressure for the transportation of production fluid in gas oil field. It is a challenge to maintain pump performance while flow parameters in each stage vary due to the compressibility of gas-liquid phase. In this article, a stage-by-stage design method is proposed to improve the boosting capability of a multiphase pump. Variations of flow parameters in each stage are investigated based on computational fluid dynamics (CFD) numerical simulation. Available methods to determinate main impeller geometry parameters of impeller are discussed. The stage-by-stage design method is applied on a five-stage multiphase pump when the inlet gas volume fraction (GVF) are 30% and 50% separately. The second stage is modified base on its corresponding inlet flow parameters when inlet GVF is 30% while the second and third stage are modified when inlet GVF is 50%. Flow parameters, pressure distribution and velocity distribution are compared between the original pump and modified pump. Differential pressure of the modified pump increases by 53.72 kPa and 58.57 kPa respectively when inlet GVFs are 30% and 50%. The feasibility of the stage-by-stage design method is verified through the comparison results.

旋转动力多相泵通常配备有许多压缩单元，以提供足够的增压压力，以在天然气油田中输送生产流体。保持泵的性能是一个挑战，而每个阶段的流量参数由于气-液相的可压缩性而变化。本文提出了一种逐步设计方法，以提高多相泵的增压能力。基于计算流体动力学（CFD）数值模拟，研究了每个阶段中流量参数的变化。讨论了确定叶轮主要叶轮几何参数的可用方法。当进气体积分数（GVF）分别为30％和50％时，逐步设计方法应用于五级多相泵。当入口GVF为30％时，根据其相应的入口流量参数修改第二阶段，而当入口GVF为50％时，对第二和第三阶段进行修改。比较了原始泵和改进后的泵的流量参数，压力分布和速度分布。当入口GVFs为30％和50％时，改进型泵的压差分别增加53.72 kPa和58.57 kPa。通过比较结果验证了分阶段设计方法的可行性。入口GVF为30％和50％时分别为57 kPa。通过比较结果验证了分阶段设计方法的可行性。入口GVF为30％和50％时分别为57 kPa。通过比较结果验证了分阶段设计方法的可行性。