叶轮进口直径对排污泵多相流性能的影响  

Influence of impeller inlet diameter on multiphaseflow performance of sewage pump

作　　者：张岩璐 徐云峰[1,2,3] 王震 杨陈 许彬 ZHANG Yanlu;XU Yunfeng;WANG Zhen;YANG Chen;XU Bin(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Lanshen Group Co.,Ltd.,Nanjing,Jiangsu 211500,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013 [2]蓝深集团股份有限公司,江苏南京211500 [3]江苏大学机械工程学院,江苏镇江212013

出　　处：《排灌机械工程学报》2023年第7期663-669,676,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省高等学校基础科学(自然科学)重大项目(21KJA470002);江苏省博士后科研基金资助项目(2021K086A)。

摘　　要：为研究叶轮进口直径对排污泵多相流性能的影响,以3种不同进口直径(100,120,140 mm)的双叶片叶轮为研究对象,采用Mixture多相流模型、Rayleigh-Plesset空化模型和Gidaspow曳力模型对泵内固液气三相流动进行定常数值计算,并将外特性计算结果与试验结果进行对比分析.研究结果表明:增大叶轮进口直径会导致排污泵的运行高效区向小流量偏移,这有助于抑制多相流条件下外特性的降低;叶轮进口直径为100 mm的泵内多相流的效率相对于单相流的效率降低了10.27%,而叶轮进口直径为120 mm的泵和叶轮进口直径为140 mm的泵内多相流的效率相对于单相流的效率分别降低了6.54%和8.20%;3种进口直径的叶轮对应的排污泵临界空化余量分别为4.03,2.06和1.95 m,这表明增大叶轮进口直径能够显著改善泵的抗空化性能,空化造成的流动阻塞效应得到有效缓解;在叶轮进口直径为100 mm的泵内监测到流速较高的固体颗粒,并且随着叶轮进口直径的增大,叶轮表面的固相体积分布减小,泵内固相流速也有所降低,适当增大叶轮进口直径有助于提高排污泵的多相流动性能.To study the effect of impeller inlet diameter on the multiphase flow performance of sewage pump,three double-blade impellers with different inlet diameters(100,120,140 mm)were employed as the research object.The mixture multiphase model,Rayleigh-Plesset cavitation model and Gidaspow drag model were used to conduct steady numerical calculation of solid-liquid-gas three-phase flow in the pump,and the hydraulic characteristics of the sewage pump also be predicted.The research results show that increasing the diameter of the impeller inlet will cause the high-efficiency area of the sewage pump to shift to a small flow rate,but it will help to suppress the degradation of the hydraulic characteristics under the condition of multiphase flow.The efficiency of multiphase flow in the pump with impeller diameter of 100 mm is 10.27%lower than that of single-phase flow,while the efficiency of multiphase flow in the pump with impeller diameter of 120 mm and the pump with impeller diameter of 140 mm are 6.54%and 8.20%lower than that of single-phase flow,respectively.This indicates that increasing the impeller inlet diameter can significantly improve the anti-cavitation characteristics of the pump,and the critical net positive suction head of the sewage pump corresponding to the three impeller diameters are 4.03,2.06 and 1.95 m,respectively.The flow blockage effect caused by cavitation can be effectively mitigated.Solid particles with high flow velocity are monitored in the pump with an inlet diameter of 100 mm,and the solid phase volume distribution on the impeller surface decreases with the increase of inlet diameter,and the solid phase flow velocity in the pump also decreases.The research shows that appropriately increasing the diameter of the impeller inlet is helpful to improve the multiphase flow performance of the sewage pump.

关 键 词：排污泵 多相流 叶轮进口直径 外特性 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程] O352[农业科学—农业工程]