低比转速泵反转透平性能换算修正方法  

Low Specific Speed Pump as Turbine Performance Conversion Correction Method

作　　者：王晓晖[1,2] 夏正廷 敏政 郝艳[1] 匡开林 Wang Xiaohui;Xia Zhengting;Min Zheng;Hao Yan;Kuang Kailin(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and Systems,Gansu Province,Lanzhou 730050,China)

机构地区：[1]兰州理工大学能动学院,兰州730050 [2]甘肃省流体机械及系统重点实验室,兰州730050

出　　处：《流体机械》2019年第10期24-29,共6页Fluid Machinery

基　　金：国家自然科学基金资助项目(51569013)

摘　　要：离心泵反转作透平(PAT)可回收液体能量。泵工况和透平工况流量、扬程换算关系Ht/Hp、Qt/Qp是PAT选型设计与性能预测的关键,而现有的换算关系对低比转速PAT误差较大。通过分析放大系数及速度滑移对低比转速PAT性能换算关系的影响,得到一种性能换算的修正方法。对比转速为33~86的8台PAT采用数值模拟软件FLUENT 17.0进行数值计算,分别得出其扬程、流量换算关系的修正系数。该修正系数与比转速的关系通过多项式拟合得到。采用已公开的7台低比转速PAT试验结果验证,与其他方法相比采用该修正系数计算的Ht/Hp、Qt/Qp误差约减小3%~15%。针对低比转速PAT的选型设计和性能预测该方法可提供理论指导。The centrifugal pump as turbine(PAT)can recover liquid energy.The flow rate and head conversion relationships(Ht/Hp,Qt/Qp)between pump mode and turbine mode are the key to selection design and performance prediction of PAT,while the existing conversion relationship has a large error for the low specific speed PAT.In this paper,By analyzing the influence of enlargement coefficient and velocity slip on the performance conversion relationship of low specific speed PAT,and a corrective method for performance conversion is obtained.8 PATs with a specific speed of 33-86 were numerically calculated by using The computational fluid dynamics software FLUENT 17.0,then the correction coefficients of their head and flow conversion relationships were obtained respectively.The relation between the correction coefficient and specific speed is obtained by polynomial fitting.The results of seven low specific speed PAT tests have been used to verify the corrective method,Compared with other methods,the errors of Ht/Hp and Qt/Qp calculated by this correction coefficient are reduced about 3%~15%.This method can provides theoretical guidance for the selection design and performance prediction of low specific speed PAT.

关 键 词：离心泵 泵反转液力透平 低比转速 换算关系 修正系数 

分 类 号：TH311[机械工程—机械制造及自动化] TK73[交通运输工程—轮机工程]