Abstract
In order to study the influence of the position of the bulb on the hydraulic performance of a submersible tubular pump device, based on a large-scale pumping station, two schemes—involving a front-mounted bulb and a rear-mounted bulb, respectively—were designed. The front-mounted scheme uses the GL-2008-03 hydraulic model and its conventional guide vane, while the rear-mounted scheme uses the optimized design of a diffuser vane. The method of combining numerical simulation and experimental testing was used to analyze the differences between the external and internal characteristics of the two schemes. The results show that, under the condition of reasonable diffusion guide vane design, the efficiency under the rear-mounted scheme is higher than that under the front-mounted scheme, where the highest efficiency difference is about 1%. Although the front-mounted bulb scheme reduces the hydraulic loss of the bulb section, the placement of the bulb on the water inlet side reduces the flow conditions of the impeller. Affected by the circulation of the guide vane outlet, the hydraulic loss of the outlet channel is greater than the rear-mounted scheme. The bulb plays a rectifying function when the bulb is placed behind, which greatly eliminates the annular volume of the guide vane outlet, and the water outlet channel has a smaller hydraulic loss. In the front-mounted scheme, the water flow inside the outlet channel squeezes to the outer wall, causing higher entropy production near the outer wall area. The entropy production of the rear-mounted scheme is mainly in the bulb section and the bulb support. This research can provide reference for the design and form selection of a submersible tubular pump device, which has great engineering significance.
Highlights
A submersible tubular pump device is a type of electromechanical integrated pump device that closely combines a water pump and a submersible motor
According to the different bulb arrangements, bulb-type submersible tubular pump devices can be divided into bulb frontmounted schemes and bulb rear-mounted schemes
The maximum efficiency point flow of the front- and rear-mounted solutions were both around 295 L/s, the maximum efficiency of the rear-mounted solution was about 78.4%, the maximum efficiency of the front-mounted solution was about 77.5%, and the difference in efficiency was about 1%. This is consistent with the results in the literature [24], which indicate that the efficiency of the rear-mounted submersible tubular pump device is higher than that of the front-mounted scheme under the premise of a good guide vane design
Summary
A submersible tubular pump device is a type of electromechanical integrated pump device that closely combines a water pump and a submersible motor. The above research focused on the flow channel and did not optimize the design of the diffusion guide vane, while the front-mounted scheme adopts the conventional axial flow pump guide vane with good performance, and some studies have not compared the two devices through model tests. In view of the above limitations, this article considers a large-scale submersible tubular pump station, through a combination of experiments and numerical simulation, in order to systematically compare the hydraulic performance of bulb front-mounted and rear-mounted submersible tubular pumps. It provides a reference for the subsequent construction of similar pumping stations and has high research significance and application value
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