| 平衡孔直径对离心泵叶轮进口流态的影响 |
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| 引用本文： | 刘在伦,杨凯越,芦维强,苏丹枫.平衡孔直径对离心泵叶轮进口流态的影响[J].排灌机械工程学报,2020,38(10):973-978. |
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| 作者姓名： | 刘在伦 杨凯越 芦维强 苏丹枫 |
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| 作者单位： | 兰州理工大学能源与动力工程学院,甘肃 兰州 730050;兰州理工大学温州泵阀工程研究院,浙江 温州 325105;兰州理工大学能源与动力工程学院,甘肃 兰州 730050;重庆三峡学院环境与化学工程学院,重庆 404000 |
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| 基金项目： | 国家自然科学基金;浙江省自然科学基金 |
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| 摘 要： | 为研究平衡孔直径对离心泵叶轮进口流态的影响,在降速后的IS80-50-315型离心泵上,用平衡孔直径d分别为0,4,6,8,10 mm的同一个叶轮,对离心泵的扬程、效率和轴功率进行预测,研究泵在设计工况、不同平衡孔直径时叶轮进口处速度矢量和压力的分布情况,并监测叶轮进口处的压力脉动特性.结果表明:加大叶轮平衡孔直径,泵的扬程与效率下降、轴功率提高,且在小流量工况下泵扬程变化更为明显;随着平衡孔直径的增大,平衡孔内液体流速减小,对叶轮进口流体的冲击作用逐渐减弱,叶轮进口处压力变得均匀,在一定程度上改善了泵的抗汽蚀性能;随着平衡孔直径的增大,叶轮进口主流区的压力脉动幅值减小,在一定程度上稳定了压力脉动幅值的变化,改善了其不稳定特性;平衡孔直径增大时,叶轮进口区平均静压变化逐渐稳定.研究成果为离心泵叶轮平衡孔直径的选择提供了参考.
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| 关 键 词： | 离心泵 平衡孔直径 叶轮进口流态 数值模拟 压力脉动 |
| 收稿时间： | 2018-08-11 |
Influence of balance hole diameter on flow state at the inlet of centrifugal pump impeller |
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| LIU Zailun,YANG Kaiyue,LU Weiqiang,SU Danfeng.Influence of balance hole diameter on flow state at the inlet of centrifugal pump impeller[J].Journal of Drainage and Irrigation Machinery Engineering,2020,38(10):973-978. |
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| Authors: | LIU Zailun YANG Kaiyue LU Weiqiang SU Danfeng |
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| Institution: | 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Engineering Institute of Wenzhou Pump & Value, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China; 3. College of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404000, China |
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| Abstract: | In order to research the influence of the balance hole diameter on flow state at the inlet of the centrifugal pump impeller, the IS80-50-315 type centrifugal pump with speed reduced was taken as the research object, and an identical impeller with a series of impeller balance hole diameters of 0, 4, 6, 8, and 10 millimeters was used to predict the pump head, efficiency and shaft power. The velo-city vector and pressure distribution of impeller inlet with different balance hole diameters under the design condition of pump were studied, and the pressure fluctuation characteristics at the inlet of impeller were monitored. The results show that with the increase of the balance hole diameter, the head and efficiency decrease, but the shaft power increases. The change of pump head is more obvious under the small flow condition than under the large flow condition. With the increase of the diameter of the balance hole, the liquid flow velocity in the balance hole decreases, and the impact on the liquid flow of the impeller inlet gradually decreases. The pressure at the impeller inlet becomes uniform, improving the anti-cavitation performance of the pump. The pressure fluctuation amplitude in the main flow area of the impeller inlet decreases with the increase of the balance hole diameter, and the change of the average static pressure at the impeller inlet is gradually stable. This study provides a reference for selecting the diameter of the impeller balance hole. |
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| Keywords: | centrifugal pump balance hole diameter impeller inlet flow state numerical simulation pressure fluctuation |
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