串联离心泵过流部件空化及磨损的数值模拟

Numerical Simulation of Cavitation and Wear of Flow Passage Parts in Series Centrifugal Pumps

摘要: 为了分析含沙水流通过离心泵时，其过流部件受到破坏是由于泥沙磨损还是空蚀影响，设计一套串联离心泵模型。基于CFturbo对串联离心泵进行建模，并通过UG软件进行优化，使用ICEM进行网格划分，最后通过CFX软件进行含沙水介质条件下串联离心泵内部流场的数值模拟。结果表明：通过提高含沙水介质进入离心泵的进口压力可以减缓离心泵受到的空蚀破坏，并不能改变离心泵过流部件受到磨损破坏的位置；离心泵受到空化破坏的位置主要集中在叶轮进口处，叶片吸力面进口处、压力面出口处是离心泵主要受到泥沙磨损的位置。

Abstract: In order to analyze the flow of sand-containing water through the centrifugal pump, the damage of the flow-through components is due to the influence of sediment abrasion or cavitation; and a series centrifugal pump model is designed. Based on CFturbo software to model the centrifugal pump in series, and optimized by UG software, using ICEM for meshing. Finally, the numerical simulation of the internal flow field of a centrifugal pump in series with sandy water medium was performed by CFX software. The results show: Cavitation damage to the centrifugal pump can be reduced by in-creasing the inlet pressure of the sandy water medium into the centrifugal pump. It does not change the position where the centrifugal pump’s flow passage components are worn out. Centrifugal pump cavitation damage is mainly concentrated in the impeller inlet. The inlet of the suction surface of the blade and the outlet of the pressure surface are locations where the centrifugal pump is mainly exposed to sediment.