双吸式离心泵空化判定的数值模拟研究  

Numerical Research on the Determination of Cavitation Characteristics of the Double-suction Centrifugal Pump

作　　者：林依水 郭志伟[1,2] LIN Yi-shui;GUO Zhi-wei(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430000,Hubei Province,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi′an University of Technology,Xi′an 710048,Shaanxi Province,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430000 [2]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048

出　　处：《中国农村水利水电》2023年第4期238-243,共6页China Rural Water and Hydropower

基　　金：省部共建西北旱区生态水利国家重点实验室(西安理工大学)开放研究基金(2021KFKT-14)。

摘　　要：采用两相流模型,对不同流量工况下双吸式离心泵内空化进行数值模拟计算,研究双吸式离心泵内空化发展过程及性能演变。结果表明:随空化发展,双吸式离心泵扬程及效率显著下降,叶轮内空化最先发生在叶片吸力面进口靠近轮毂处,向盖板和叶片出口扩散。临界空化判定上,效率下降1%比扬程下降3%更合理;空化初生判定上,效率下降0.1%可以作为相应的判断依据。The two-phase flow model is used to simulate the cavitation of the double-suction centrifugal pump under different flow condi⁃tions,and the development process and performance evolution of the double-suction centrifugal pump are studied.The results show that with the development of cavitation,the head and efficiency of the double-suction centrifugal pump decrease significantly,and the cavitation in the impeller first occurs near the hub of the suction surface of the blade,and spreads to the plate and the outlet of the blade.In the judgment of critical cavitation,the efficiency reduction of 1%is more reasonable than 3%of the head decrease,but neither is suitable as the judgment basis for cavitation inception.Based on the development law of cavitation in the impeller,the efficiency reduction of 0.1%may be used as the judgment basis for cavitation inception of double-suction centrifugal pumps.

关 键 词：双吸式离心泵 空化特性 临界空化 初生空化 

分 类 号：TV136.2[水利工程—水力学及河流动力学]