Abstract
In order to provide specific references and suggestions for the design and operation of underground pumping stations, in this paper, an experimental model of an underground pumping station, including 4 pumps and 2 pump intakes (primary and secondary), was obtained through similitude of fluid mechanics. The phase diagrams of various vortices, in terms of different dimensionless numbers are presented, which can reveal their appearance and evolution process. Three specific cases with different vortex flows were analyzed. The experiment results may provide a reference for the current design guidelines for underground pumping stations.
Highlights
IntroductionUnderground pumping stations are named because, in contrast to conventional pumping stations (Figure 1a), they are located partly or fully below the ground level, usually 10–100 meters or more underground (Figure 1b), corresponding to the topographic height of the inflow
With the increasing requirements for urban environment and land resources, underground pumping stations are being widely applied in underground mines, nuclear power plants, sewage treatment plants, and groundwater diversion projects, etc. [1,2,3,4].Underground pumping stations are named because, in contrast to conventional pumping stations (Figure 1a), they are located partly or fully below the ground level, usually 10–100 meters or more underground (Figure 1b), corresponding to the topographic height of the inflow
It should be pointed out that the V-level free-surface vortex, the III- and IV-level submerged vortices are presented by a large number of experimental processes in this paper, which may be caused by the violent fluctuation of the water surface or the high air content of the fluid in the test
Summary
Underground pumping stations are named because, in contrast to conventional pumping stations (Figure 1a), they are located partly or fully below the ground level, usually 10–100 meters or more underground (Figure 1b), corresponding to the topographic height of the inflow. This leads to a deep water-collecting well (primary pump intake). It is noted that in underground pumping stations, it is usually necessary to position a secondary pump intake to facilitate the maintenance and desilting works on the high content of impurities, silt, and other solid particles in the water. A number of research studies have focused on the experimental and numerical capture of the vortex flows, and the flow distribution around the pipe bell in the intake channel
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