期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：240
期号：3
页码：1-11
DOI：10.1088/1755-1315/240/3/032011
出版社：IOP Publishing
摘要：The pumping station along the Yangtze River runs around the zero head all the year round, and the work flow rate deviates from the design condition, which is easy to cause hydraulic vibration, and seriously affects the safety of the unit. By using the CFD software, the numeric simulation of typical low head Two-way pumping system was made. The flow characteristics and pressure fluctuation characteristics of two-way flow channel with large flow rate are calculated and analysed. The calculated results are verified by model tests. The results show: Under the super low head condition, the flow pattern of the main flow area of the inlet and outlet channel is better, but the blind end of the inlet and outlet of the flow channel has larger reflux. The pressure fluctuation at the monitoring point of the impeller and guide vane has obvious periodic variation rule. Due to impeller rotation, the pressure fluctuation exists alternately in the impeller. Frequency domain graph display based on fast Fourier transform, the main frequency of each point at the outlet of the impeller are all blade passing frequency (BPF). The main frequency of impeller inlet and guide vane outlet was the multiples of BPF. The pressure fluctuation in the inlet and outlet channel is more complicated, the low frequency fluctuation dominates, and the fluctuation amplitude decreases greatly. The research results can provide reference for hydraulic vibration research of super low head pumping station along the Yangtze River.
