喇叭管悬空高度对井筒式泵站运行性能影响研究  

Study on influence of suspended height of trumpet tube on operation performance of shaft pumping station

作　　者：顾双[1] 殷宪柱 刘刚 许生 GU Shuang;YIN Xianzhu;LIU Gang;XU Sheng(Jiangsu Luoyun Water Conservancy Project Management Office,Suqian 223800,China;Suqian Water Survey,Design and Research Institute Co.,Ltd,Suqian 223800,China)

机构地区：[1]江苏省骆运水利工程管理处,江苏宿迁223800 [2]江苏宿迁市水务勘测设计研究院有限公司,江苏宿迁223800

出　　处：《人民长江》2021年第6期188-194,共7页Yangtze River

摘　　要：为了探究喇叭管悬空高度对井筒式泵站运行性能以及泥沙沉积的影响,采用CFX对井筒式泵站内流动特性进行了CFD数值模拟。模拟过程中,将井筒式泵站内计算流体视为固液两相流,设计了0.3D,0.7D,1.1D和1.5D 4个不同的喇叭管悬空高度方案。计算结果表明:方案1-4中泵装置运行最高效率分别为76.4%、79.3%、78.5%和78.8%,方案2中泵装置的运行效率以及最高高效区范围最大;方案1中存在大尺度漩涡,方案3和方案4中存在泥沙沉积现象,因此认为最优方案为方案2,该方案的优点是没有泥沙沉积、漩涡尺度小,并且流场结构稳定、总水力损失最小。通过分析喇叭管悬空高度对井筒式泵站运行性能和泥沙沉积情况的影响,说明只有合适的喇叭管悬空高度,才能够保证井筒式泵站的安全稳定运行。研究成果可为工程中井筒式泵站设计提供一定的参考。In order to explore the influence of the suspended height of the trumpet tube on the operation performance and sediment deposition of the shaft pumping station,this paper uses CFX to simulate flow characteristics in the shaft pumping station.The solid-liquid two-phase flow is adopted for the calculation fluid in the shaft pumping station.Four schemes of 0.3 D,0.7D,1.1D and 1.5 D of different suspended height of the trumpet tube are designed.The calculation results show that the maximum efficiency of scheme 1 to scheme 4 is 76.4%,79.3%,78.5%and 78.8%respectively,and scheme 2 has the highest operation efficiency of and the widest efficiency range.There are large-scale vortices in scheme 1,and sediment deposition in schemes 3 and 4.The optimal scheme is scheme 2,and it is characterized as no sediment deposition,small vortex scale,stable flow field structure and minimum total hydraulic loss.By analyzing influence of the suspended height of trumpet tube on the operation performance and sediment deposition of the shaft pumping station,it is found that only the appropriate suspended height of the trumpet tube can ensure the safe and stable operation of the shaft pumping station.The research results can provide some reference for the design of the shaft pumping station in the project.

关 键 词：喇叭管悬空高度 井筒式泵站 CFD 泥沙淤积 流场特性 漩涡尺度 

分 类 号：TV732[水利工程—水利水电工程]