Investigation on the Effect of the Shaft Transition Form on the Inflow Pattern and Hydrodynamic Characteristics of the Pre-Shaft Tubular Pump Device

Luo, Can; Du, Kai; Qi, Weijun; Cheng, Li; Huang, Xianbei; Lu, Junfu

doi:10.3389/fenrg.2022.955492

Cited by 6 publications

(8 citation statements)

References 31 publications

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“…The total energy difference between the inlet of the inlet passage and the outlet of the outlet passage of the pumping system is defined as the pumping system head and is expressed in equation. 1 where Pin for the total pressure of the inlet passage inlet (Pa); Pout for the total pressure of the outlet passage outlet (Pa); ρ for the density of water (m³/s); g for the acceleration of gravity (m/s 2 ).…”

Section: Evaluation Indicatorsmentioning

confidence: 99%

“…The optimization of the vertical shaft tubular pumping device and the analysis of the related flow pattern, energy, and other characteristics have become the focus of research by experts and scholars at home and abroad. 1 Tao et al 2 proposed a case based on flow pattern construction and natural heuristics that can reduce the flow resistance and pressure variation in the inlet passages including pumping systems. Ahmed et al 3 to improve the problem of turbulence in the forebay of the lateral inlet pumping system, based on the computational fluid dynamics method (CFD) technology compares and analyzes the numerical simulation with or without rectification measures for the forebay of the lateral intake pumping system when multiple units are operating.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of low-head shaft tubular pumping systems based on entropy production theory

Wang,

Jiao,

Cheng

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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In order to improve the operation efficiency of low-head tubular pump, this paper studies the influence of shaft type in the shaft tubular pump on the flow characteristics and energy characteristics of the pump. To optimize the shaft structure of shaft tubular pumping systems and realize the efficient use of energy, numerical simulation and model test was employed to study the optimization of the entire pumping system. In this paper, the CFD method was used to numerically simulate the whole pumping system, and the effect of changing the shaft length, shaft head profile, and shaft tail profile on the internal flow and entropy production characteristics of the inlet passage and impeller position were analyzed. It is found that the tapered tail profile can make the inlet passage overflow area change more smoothly and thus make the flow pattern more favorable. The wall entropy production dissipation at the inlet passage position dominates the total entropy production, and the high-value area of mainstream entropy production at this position is distributed periodically. The mainstream entropy production dissipation at the impeller section accounts for a relatively large proportion. After the entropy production dissipation analysis, it is believed that the tapered can reduce the entropy production dissipation of the pumping systems. The change of the shaft tail profile will make the entropy production dissipation change more noticeable compared with other optimization factors. Therefore, the tapered tail profile with better transition in the actual project is recommended.

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Section: Evaluation Indicatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of low-head shaft tubular pumping systems based on entropy production theory

Wang,

Jiao,

Cheng

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…[14] investigated the impact of inlet and outlet flow channels, as well as front guide vanes, on the hydraulic performance of a tubular pumping station, determining that the distance between the shaft tail and the impeller center has the greatest influence on the velocity uniformity of the outlet section within the inlet channel. Luo, C. [15] performed numerical simulations to explore how different shaft-type transitions affect inflow efficiency and hydrodynamic performance at the entrance of shaft-type tubular pumping stations. The research, further supported by experimental validation, identified an optimal transition configuration.…”

Section: Introductionmentioning

confidence: 99%

Energy Characteristics in the Flow Channel of the Shaft-Type Tubular Pumping Station Considering Tides

He,

Luo,

Cheng

et al. 2024

JMSE

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The shaft-type tubular pumping station has the remarkable characteristics of a large flow rate and high efficiency. It can realize the functions of irrigation, pumping, and drainage through pumping and generating conditions considering tides. Moreover, it is widely used in the plain area of eastern China and the tidal area along the marine region. Due to the different topological features of the airfoil of the impeller, the energy evolution characteristics of the shaft-type tubular pumping station during pumping and generating conditions remain unclear. The entropy generation theory was introduced to numerically simulate the flow pattern and energy characteristics in the shaft-type channel, impeller, and straight channel in operation conditions. The results show that the flow pattern is stable when the shaft-type channel and the straight-type channel are used as the inlet channel under pumping and generating conditions, and a low-pressure region occurs in the contraction section of the shaft-type channel. The velocity of sections of the inlet and outlet and the middle section of the impeller in the generating condition is larger than that in the pumping condition. In addition, the difference in the static pressure on the blade surface nearby the hub is large. With a change in the position of the wingspan, the difference gradually decreases from the small flow condition to the large flow condition. There is a high-entropy production rate zone in the channel contraction section and the shaft-type wall surface of the shaft-type flow channel. When the straight-type channel is used as the outlet flow channel, a high-entropy production region appears near the inlet water surface. In the pumping condition, a high-entropy production area is found at the inlet of the impeller, the blade groove channel, and the inlet of the guide vane. In the generating condition, a high-entropy production area is found at the out-of-impeller outlet, the blade groove channel, and the outlet of the guide vane. These research achievements have some reference value for the design of the shaft-type tubular pumping station considering tides and the study of hydraulic performance, along with the energy characteristics of the channels.

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“…An axial flow pump is a typical vane pump that is widely used in the coastal plain area [1,2]. In China, the shaft tubular pump device (STPD) has been used in more than one hundred pump stations to date [3,4]. Recently, the range of water level fluctuations in coastal areas has increased due to global climate change.…”

Section: Introductionmentioning

confidence: 99%

Study on the Energy Loss Characteristics of Shaft Tubular Pump Device under Stall Conditions Based on the Entropy Production Method

Ji,

Lu,

et al. 2023

JMSE

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This study aimed to reveal the energy loss characteristics of each part of the shaft tubular pump device (STPD) under stall conditions. Numerical simulations were conducted by using the SST k-ω turbulence model with curvature correction, and the reliability of the simulation results was verified by a model test. The entropy production method was used to evaluate and visualize the energy loss. The results show that turbulent entropy production (TEP) is the main source of energy loss in each component of the STPD, and the TEP increases significantly with the deterioration of stall. The energy loss in the impeller is mainly concentrated near the shroud and hub, while in the guide vanes it is mainly concentrated near the shroud and suction surface of the blades. In addition, with the deterioration of stall, the energy loss in the inlet of the impeller and guide vanes increases significantly. Influenced by the backflow from the impeller, there is a significant amount of energy loss at the outlet segment of the inlet passage, and the location of the high-energy-loss region is consistent with the backflow region. Affected by the flow separation vortex at the tail of the guide vanes, the energy loss in the outlet passage is mainly concentrated at the inlet segment.

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Investigation on the Effect of the Shaft Transition Form on the Inflow Pattern and Hydrodynamic Characteristics of the Pre-Shaft Tubular Pump Device

Cited by 6 publications

References 31 publications

Optimization of low-head shaft tubular pumping systems based on entropy production theory

Optimization of low-head shaft tubular pumping systems based on entropy production theory

Energy Characteristics in the Flow Channel of the Shaft-Type Tubular Pumping Station Considering Tides

Study on the Energy Loss Characteristics of Shaft Tubular Pump Device under Stall Conditions Based on the Entropy Production Method

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