), 邵珂1, 戴韬1 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.江苏大学 镇江流体工程装备技术研究院,江苏 镇江 212009
收稿日期:2019-03-26出版日期:2020-08-28发布日期:2020-08-18作者简介:杨孙圣(1985-),男,河南省焦作市人,副教授,现主要从事液力透平方面的研究.电话(Tel.):15805292015;E-mail:Influence of Parallel Impeller Inlet Trimming on Mixed Flow Pump as Turbine
YANG Sunsheng1,2(), SHAO Ke1, DAI Tao1 1. National Research Center of Pump, Jiangsu University, Zhenjiang 212013, Jiangsu, China
2. Zhenjiang Research Institute of Fluid Engineering Equipment Technology, Jiangsu University, Zhenjiang 212009, Jiangsu, China
Received:2019-03-26Online:2020-08-28Published:2020-08-18摘要/Abstract
摘要： 为了探究叶轮切割对混流泵作透平的影响,设计一比转速为240的混流泵作透平,平行叶轮进口进行4次切割,切割同时保留透平叶轮的前后盖板,运用CFD与试验结合的方法得出混流泵作透平的外特性,分析叶轮切割对混流泵作透平的内部流动影响.结果表明:随着叶轮切割比例增加,混流泵作透平流量效率曲线向小流量工况偏移,在小流量区间,透平轴功率上升,扬程下降,在大流量区间透平轴功率下降,扬程上升.叶轮切割后叶轮与蜗壳间的循环流量增加,透平水力损失增加,因而透平最高效率下降.采用混流泵切割定律推测不同切割比例下透平高效点的外特性参数,发现推测所得外特性均高于试验值,但误差较小,混流泵叶轮切割定律可近似用于透平工况下叶轮切割的高效点预测.
关键词: 叶轮切割, 混流泵作透平, 数值模拟, 理论公式
Abstract: To study the influence of impeller trimming on mixed flow pump as turbine, a turbine whose specific speed is 240 is designed. The impeller inlet has been trimmed in parallel for four times and its shroud and hub are retained. By using the method of CFD and test, the turbine performance is obtained and the internal flow of the mixed flow pump as turbine is analysed. The result shows that with the increase in the trimming ratio, the best efficiency point moves to the small flow region. In the small flow region, the shaft power rises and the head drops. In the large flow region, the shaft power drops and the head rises. The circulation flow between the impeller and the volute increases so that the highest efficiency of the turbine decreases. The theoretical formulas are used to predict the performance of the mixed flow pump as the best efficiency point of the turbine, and the efficiency and head are higher than those in the test results, with smaller errors. It can be found that the formulas of the impeller trimming of mixed flow pump are almost suitable for the impeller trimming of mixed flow pump as turbine.
Key words: impeller trimming, mixed flow pump as turbine, numerical simulation, theoretical formula
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