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;

Abstract: 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 0.3D,0.7D,1.1D and 1.5D 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.

Key words: suspended height of the trumpet tube; shaft pumping station; CFD; sediment deposition; flow field characteristics; vortex scale;