The mechanism of internal energy losses in double- suction centrifugal pumps under direct and reverse conditions

Miao, Senchun; Tan, Xingxing; Luo, Wen; Wang, Xiaohui; Yang, Junhu

doi:10.1016/j.energy.2024.132547

Energy

2024

DOI: 10.1016/j.energy.2024.132547

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The mechanism of internal energy losses in double- suction centrifugal pumps under direct and reverse conditions

Senchun Miao,

Xingxing Tan,

Wen Luo

et al.

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Cited by 3 publications

References 33 publications

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Influence of internal flow structure on flow energy losses in a centrifugal pump with splitter blades using entropy generation theory

Gad,

Gao,

et al. 2024

Thermal Science and Engineering Progress

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Influence of internal flow structure on flow energy losses in a centrifugal pump with splitter blades using entropy generation theory

Gad,

Gao,

et al. 2024

Thermal Science and Engineering Progress

View full text Add to dashboard Cite

Optimization of hub geometry of a double suction pump as a turbine

Yang,

Liu,

Singh

et al. 2024

Physics of Fluids

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The double suction pump as a turbine plays an increasingly important role in energy recovery and hydropower generation due to its stable operation and simple structure. Therefore, optimization research on it is of great significance. In this article, the unique design of the hub structure in double suction pumps consisting of conventional half hubs is proposed to be modified to extend the hub until the outer diameter and analyzed. Numerical calculations based on the shear stress transport (SST) k-ω model and verified by experiments show that the full hub impeller exhibited superior hydraulic performance, with an efficiency about 1%–2% higher than the half hub impeller under all operating conditions. Entropy production theory is employed to analyze energy losses, we found that full hub impellers, compared to half hub models, significantly reduce energy loss, with a maximum reduction of about 5.45%. In addition, the full hub impeller reduces turbulence losses up to 5.32% on the one hand and increases friction losses up to 4.52% on the other hand, but turbulence losses account for a larger proportion of the total losses, so the overall efficiency is improved.

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Investigation on the flow characteristics of a centrifugal pump with a fractured leading edge of a single blade

Li,

Zhang,

et al. 2025

Physics of Fluids

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Centrifugal pumps are essential in various industrial applications, and their stable and efficient operation has a direct impact on the overall performance of the system. This study simulates different lengths of fractures at the LE (leading edge) of a single blade to conduct an in-depth analysis of their effects on internal flow and transient characteristics. The study reveals that the most significant effects of blade LE fractures on pump performance occur near a flow rate of 0.8Qd, where the head and efficiency can decrease by up to 6.19% and 3.77%, respectively, compared to the original blades. Blade fractures lead to deterioration of flow on the pressure and suction sides, creating vortices and inducing leakage flow, while entropy production significantly increases in this area. A 230.1% increase in the distribution angle and a 26.6% increase in the maximum radial force reflect changes in the radial force distribution. Also, LE fractures make the wall pressure pulsations stronger at the SPF (shaft passing frequency), and they make the amplitude of the pulsations on the blade surface much bigger at both SPF and 3SPF frequencies. Finally, LE fractures change the way vibrations behave at radial measurement points in both the x and y directions in a big way. The acceleration amplitudes at SPF and 3SPF frequencies go up by 125.8%, 193.1%, and 62.5%, 184.6%, respectively. These findings provide an important theoretical basis for the early warning and diagnosis of blade fracture failures.

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The mechanism of internal energy losses in double- suction centrifugal pumps under direct and reverse conditions

Cited by 3 publications

References 33 publications

Influence of internal flow structure on flow energy losses in a centrifugal pump with splitter blades using entropy generation theory

Influence of internal flow structure on flow energy losses in a centrifugal pump with splitter blades using entropy generation theory

Optimization of hub geometry of a double suction pump as a turbine

Investigation on the flow characteristics of a centrifugal pump with a fractured leading edge of a single blade

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