超大流量大功率离心泵泥沙磨损特性  

Sediment erosion characteristics of large-flow and high-power centrifugal pumps

作　　者：吴国颖[1] 翁映标[1] 周福宁 陈门迪 樊红刚[3] WU Guoying;WENG Yingbiao;ZHOU Funing;CHEN Mendi;FAN Honggang(China Water Resources Pearl River Planning,Surveying and Designing Co.Ltd.,Guangzhou 510610,China;Guangdong Yuehai Yuexi Water Supply Co.Ld.,Zhanjiang 524033,China;Department of Energy and Power Engineering,Tsinghua University,Bejing00084,China)

机构地区：[1]中水珠江规划勘测设计有限公司,广州510610 [2]广东粤海粤西供水有限公司,广东湛江524033 [3]清华大学能源与动力工程系,北京100084

出　　处：《南水北调与水利科技（中英文）》2024年第6期1214-1223,1238,共11页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金项目(51879140)。

摘　　要：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。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(质量浓度及粒径),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,离心泵内压强分布在含沙工况与清水工况下无明显差异,低质量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。泥沙质量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。随泥沙质量浓度增大,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 Guangdong Water Resources Allocation Project around Beibu Gulf integrates a large-flow,highpower centrifugal pump system.This project is part of the national water resources comprehensive plan and is among the 150 major water conservancy projects aimed at addressing the water shortage in western Guangdong,particularly in the Leizhou Peninsula.The centrifugal pump used in this project operates under prolonged sandy conditions,which causes significant and unpredictable erosion issues.This study analyzes the erosion characteristics caused by sediment-laden water within the centrifugal pump.Sediment parameters,including particle mass concentration and size,were determined based on data collected from the West River.The solid-liquid two-phase flow within the centrifugal pump was investigated using the Euler-Lagrange method.The Oka erosion model was employed to predict the erosion characteristics of the pump's flow-through components.Numerical simulations were conducted to understand the head conditions on the erosion patterns and impact of various sediment parameters within the pump.Sediment parameters,such as particle mass concentration levels and sizes,were selected based on the typical conditions found in the West River.The influence of different operational head conditions on the pump's erosion characteristics and simulating conditions that varied from the design head to the lowest and highest head conditions was also examined.The results revealed that under typical sediment conditions,the pressure distribution within the centrifugal pump showed no significant difference between sediment-laden and clean water conditions,while lowmass concentration sediment had minimal impact on the internal flow field of the pump.However,operating the pump outside the design head condition resulted in a substantial increase in both the erosion area and intensity.Specifically,the erosion intensity at the lowest head condition was approximately three times higher than that under the design head condition.Sediment mass concentrat

关 键 词：离心泵 扬程工况 泥沙质量浓度 泥沙粒径 磨损特性 

分 类 号：TV53[水利工程—水利水电工程] TK79[动力工程及工程热物理—流体机械及工程]