摘要
【目的】提高泗阳二站改造工程泵装置的水力效率,明确泗阳二站改造后泵装置的水力性能,了解泵站的真实运行情况,便于泵站的安全运行管理。【方法】以泗阳二站的立式轴流泵装置为研究对象,采用数值模拟技术分析了原设计方案(方案1肘形进水流道的流道高度1.707D、长度3.895D、进口面积4.984D^(2);虹吸式出水流道长度6.14D、进口直径1.09D、出口面积3.934D^(2),其中D为叶轮名义直径。)的泵装置水力性能并开展了流道的优化分析,通过物理模型试验获得了泵装置的能量性能。【结果】给出了肘形进水流道弯肘段方变圆渐缩型线、出水流道隔墩起始位置及隔墩长度的优化方案,优化后的肘形进水流道出口面的轴向速度分布均匀度提高了3.32%,加权平均偏流角减小了0.945°,水力损失减小了10.4%;相比原设计方案,优化的虹吸式出水流道水力损失减小了7.51%。在叶片安放角+2°、设计扬程6.30 m时,原型泵装置流量为35.2 m^(3)/s,满足设计流量的要求,效率为76.02%;在最大扬程6.8 m时,原型泵装置流量为33.84 m^(3)/s,效率为75.97%;在平均扬程5.55 m时,原型泵装置流量36.58 m^(3)/s,效率为74.23%。【结论】在保证进出水流道主要控制尺寸不变条件时仅缩短肘形进水流道的进口宽度至2.2D,虹吸式出水流道的隔墩起始位置向出水侧移动0.772D且保持隔墩头部与水流方向垂直的条件时,泗阳二站改造工程泵装置的水力效率相对较高,有助于保障改造后泗阳二站的安全高效稳定运行。
【Objective】The purpose of this paper is to improve the hydraulic performance of the pump device in the reconstructed project of Siyang Second Station and clarify its hydraulic performance.【Method】Taking the vertical axial-flow pump device in Siyang Second Station as an example, the hydraulic performance of its original pump device was analyzed numerically, from which we optimized its inlet and outlet conduits. With D representing the nominal impeller diameter, the dimensions of the original elbow inlet conduit was: height, 1.707 D, length, 3.895 D, and inlet area, 4.984 D^(2);the dimensions of the original siphon outlet conduit was: inlet diameter, 1.09 D, length, 6.14 D, outlet area, 3.934 D^(2). The energy performance parameters of the pump device were obtained by physical model test.【Result】The optimization of the square rounded tapering geometric profile of the elbow section of the inlet conduit and the starting position and length of the outlet conduit pier is given. The uniformity of the axial velocity distribution on the outlet section of the optimized elbow inlet conduit increases by 3.32%, the weighted average deviation angle decreases by 0.945 o, and the hydraulic loss decreases by 10.4%. Compared with the original scheme, the hydraulic loss of the optimized siphon outlet conduit reduces by 7.51%. When the blade angle +2°and the design lift 6.30 m, the flow rate of the prototype pump device is 35.2 m^(3)/s, which meets the design flow requirements, and the efficiency is 76.02%. At the maximum lift of 6.8 m, the flow rate of the prototype pump device is 33.84 m^(3)/s and the efficiency is 75.97%. When the average lift is 5.55 m, the flow rate of the prototype pump device is 36.58 m^(3)/s, and the efficiency is 74.23%. 【Conclusion】When the main control sizes of the inlet and outlet conduits are not changed, the inlet width of the elbow inlet conduit is only shortened to 2.2 D, and the starting position of the siphon outlet conduit pier moves 0.772 D to the outlet section and the pier head is perpendicular to the flow direction, the hydraulic efficiency of the pump device in the reconstruction project of Siyang Second Station is relative higher. It ensures the safe, efficient and stable operation of the reconstructed Siyang Second Station. The optimization strategy provides a reference for the reconstruction and optimization of the built pumping station.
作者
吉庆伟
李进东
吕玉婷
袁尧
杨帆
JI Qingwei;LI Jindong;LYU Yuting;YUAN Yao;YANG Fan(Jiangsu Luoyun Water Conservancy Project Administration,Suqian,223800,China;Jiangsu Academy of Water Sciences,Nanjing 210017,China;College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China)
出处
《灌溉排水学报》
CSCD
北大核心
2022年第4期127-134,共8页
Journal of Irrigation and Drainage
基金
国家自然科学基金项目(51609210,51779214)
江苏省高校自然科学研究重大项目(20KJA570001)
江苏省水利科学研究院自主科研项目(2020Z026)
江苏省水利科技项目(2020029)。
关键词
轴流泵装置
流道
优化
水力性能
模型试验
axial-flow pump device
flow conduit
optimization
hydraulic performance
model test
