泵站来流形式对水泵性能的影响研究  

Study on the Influence of Flow Pattern of Pumping Station on Pump Unit Performance

作　　者：刘颖 全莉 吴泽昊 严杰 LIU Ying;QUAN Li;WU Zehao;YAN Jie(Yangzhou Survey Design Research Institute Co.,Ltd.,Yangzhou 225009)

机构地区：[1]扬州市勘测设计研究院有限公司,扬州225009

出　　处：《大电机技术》2024年第6期95-101,共7页Large Electric Machine and Hydraulic Turbine

基　　金：盐城排水系统优化改造项目(YC20200103-SG02)。

摘　　要：本文采用数值模拟对泵站正向进水和侧向进水下机组全流道内的流动特性及机组运行稳定性进行预测分析。研究对象机组为立式轴流泵装置。计算得到不同来水形式下水泵装置的外特性、流道内特性及叶轮内的压力脉动特性。研究表明:侧向进水下机组流道内存在回流和漩涡,在回流区为速度低速区,流速在0.1m/s以下,接近泥沙沉降速度。正向进水机组的运行效率明显高于侧向进水机组的运行效率,最高运行效率分别为78.89%和77.26%。正向进水和侧向进水在测点M_(1)、M_(2)、M_(3)处的压力脉动主频幅值分别为0.0046、0.0052、0.0062和0.01、0.012、0.015,叶轮进口的流速均匀度分别为92.6%和89.7%。侧向进水叶轮进口的压力脉动要比正向进水叶轮进口的压力脉动剧烈。流道内的流动特性和压力脉动特性差异说明了正向进水叶轮内流动更加稳定,研究结果在泵站设计方面具有工程参考价值和学术意义。In this paper,numerical simulation is used to predict and analyze the flow characteristics and operational stability of the entire flow channel of the unit under forward and lateral inflow of the pump station.The research object unit is a vertical axial flow pump device.Calculate the external characteristics,internal characteristics of the flow channel,and pressure pulsation characteristics inside the impeller of the water pump device under different inflow forms.Research has shown that there are backflow and eddies in the flow channel of the unit under lateral inflow,and the backflow zone is a low-speed zone with a flow velocity below 0.1m/s,close to the sedimentation velocity of sediment.The operating efficiency of the forward inlet unit is significantly higher than that of the lateral inlet unit,with the highest operating efficiencies of 78.89%and 77.26%,respectively.The main frequency amplitudes of pressure pulsation at measuring points M_(1),M_(2),and M_(3)for forward and lateral inflow are 0.0046,0.0052,0.0062,and 0.01,0.012,and 0.015,respectively.The flow velocity uniformity at the impeller inlet is 92.6%and 89.7%,respectively.The pressure pulsation at the inlet of the lateral inlet impeller is more severe than that at the inlet of the forward inlet impeller.The difference in flow characteristics and pressure pulsation characteristics within the channel indicates that forward flow occurs.The flow inside the water impeller is more stable,and the research results have engineering reference value and academic significance in pump station design.

关 键 词：泵站进水结构 外特性 流速均匀度 压力脉动 数值模拟 

分 类 号：TK730.1[交通运输工程—轮机工程]