环北部湾广东水资源配置工程地心泵站泵组属于超大流量大功率离心泵组,泵体长期在含沙工况下运行引起的磨损危害需要分析。本文以该工程离心泵为研究对象,基于欧拉-拉格朗日方法对离心泵内固液两相流动进行数值模拟,采用Oka磨损模型对离心泵过流部件磨损特性进行预测。根据西江实测数据选取泥沙参数(浓度及粒径),开展超大流量大功率离心泵泥沙磨损特性数值模拟,研究不同扬程工况、不同泥沙参数组合对离心泵磨损特性的影响规律。结果表明:典型泥沙参数条件下,离心泵内压力分布在含沙工况与清水工况下无明显差异,低浓度泥沙对泵内流场无明显影响。离心泵偏离设计扬程工况运行会导致磨损面积及磨损强度增大,最低扬程工况下泵体磨损强度约是设计扬程工况的3倍。泥沙浓度主要影响磨损强度大小,而泥沙粒径主要影响强磨损区域分布位置,二者均是影响离心泵磨损特性的主要因素。随泥沙浓度增大,叶轮前盖板磨损面积增大强度增强,但强磨损区域位置无明显变化；随泥沙粒径增大,叶轮前盖板的磨损面积减小,强磨损区域位置变化显著。

The pump unit at the Groundwater Resources Allocation Project in the Northern Bay of Guangdong is a high-flow, high-power centrifugal pump system. Prolonged operation of the pump in sandy conditions has led to significant and unpredictable erosion. This study focuses on the centrifugal pump of the project and conducts numerical simulations of solid-liquid two-phase flow within the pump using the Euler-Lagrange method. The Oka erosion model, considering particle shape correction factors, is used to predict the erosion characteristics of the pump"s overcurrent components. Utilizing measured data from the West River, sediment parameters (concentration and particle size) are selected for numerical simulations of erosion characteristics in the high-flow, high-power centrifugal pump. The study investigates the impact of different sediment parameter combinations on the pump"s erosion characteristics. Results show that under typical sediment parameter conditions, there is no significant difference in pressure distribution within the centrifugal pump between conditions with sediment and those without sediment. Low-concentration sediment has no noticeable impact on the pump"s internal flow field. Deviating from the design head conditions in centrifugal pump operation leads to an increase in erosion area and intensity, with the erosion intensity at the minimum head condition being approximately three times that at the design head condition. Sediment concentration mainly affects the magnitude of erosion intensity, while particle size primarily influences the distribution of heavily worn areas. Both factors are significant contributors to the erosion characteristics of the centrifugal pump. With an increase in sediment concentration, the erosion area and intensity on the impeller front cover plate increase, but the location of heavily worn areas remains relatively unchanged. As sediment particle size increases, the erosion area on the impeller front cover plate decreases, and the location of heavily worn areas changes significantly.

国家自然科学51879140