Energy loss analysis of the double-suction centrifugal pump under different flow rates based on entropy production theory

Guan, Hongtao; Jiang, Wei; Yang, Jianguo; Wang, Yuchuan; Zhao, Xiaoqing; Wang, Junxue

doi:10.1177/0954406220919795

Cited by 25 publications

(15 citation statements)

References 36 publications

(44 reference statements)

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“…The difference between ∆ H and ∆ H EP may have resulted from the high velocity gradient near the wall surface, where a small value of y + is required to capture wall friction [ 15 , 21 ]. Hence, it is reasonable to analyze the losses inside the volute to reveal the mechanism of energy dissipation by using the visualization methods of entropy production, as has been proven in previous studies [ 18 , 19 , 20 , 21 ].

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Section: Resultsmentioning

confidence: 99%

“…Osman et al [20] numerically tested different types of channels between two stages of a two-stage double-suction centrifugal pump. Guan et al [21] used entropy production theory to analyze losses in a double-suction centrifugal pump, and the results indicated that entropy production in the volute greatly impacted the total losses and the scattered wake vortex in the volute increased the hydraulic loss, especially under overload conditions.…”

Section: Introductionmentioning

confidence: 99%

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Energy Loss and Radial Force Variation Caused by Impeller Trimming in a Double-Suction Centrifugal Pump

Deng

Pei

Wang

et al. 2021

Entropy

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Impeller trimming is an economical method for broadening the range of application of a given pump, but it can destroy operational stability and efficiency. In this study, entropy production theory was utilized to analyze the variation of energy loss caused by impeller trimming based on computational fluid dynamics. Experiments and numerical simulations were conducted to investigate the energy loss and fluid-induced radial forces. The pump’s performance seriously deteriorated after impeller trimming, especially under overload conditions. Energy loss in the volute decreased after trimming under part-load conditions but increased under overload conditions, and this phenomenon made the pump head unable to be accurately predicted by empirical equations. With the help of entropy production theory, high-energy dissipation regions were mainly located in the volute discharge diffuser under overload conditions because of the flow separation and the mixing of the main flow and the stalled fluid. The increased incidence angle at the volute’s tongue after impeller trimming resulted in more serious flow separation and higher energy loss. Furthermore, the radial forces and their fluctuation amplitudes decreased under all the investigated conditions. The horizontal components of the radial forces in all cases were much higher than the vertical components.

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…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Loss and Radial Force Variation Caused by Impeller Trimming in a Double-Suction Centrifugal Pump

Deng

Pei

Wang

et al. 2021

Entropy

View full text Add to dashboard Cite

show abstract

“…Φ T is the entropy production due to dissipation increase and Φ θ T 2 is the entropy production caused by the heat transfer. Since the working medium inside the mixed-flow pump was set as constant temperature incompressible fluid [20,21], Φ T is the only source of entropy production inside the mixed-flow pump. In addition, the computational domain control equation is the Reynolds time-average equation, and hence the calculation formula of Φ T after time-averaged is as follows:…”

Section: Entropy Production Theorymentioning

confidence: 99%

“…The area of high hydraulic loss inside the volute was significantly reduced after optimization. Guan [20] applied entropy production theory to analyze the internal hydraulic loss characteristics of a double-suction centrifugal pump under different flow rates. The results show that the location of high hydraulic loss in the volute shifted from inlet to the baffle and tongue with the increase in flow rate.…”

Section: Introductionmentioning

confidence: 99%

The Influence of a Pumping Chamber on Hydraulic Losses in a Mixed-Flow Pump

et al. 2022

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In this study, entropy generation theory based on computational fluid dynamics (CFD) is used to study the influence of a pumping chamber type (guide vane and volute scheme) on the spatial distribution of hydraulic loss in a mixed-flow pump. The CFD data of the mixed-flow pump with a volute is validated by external characteristic test data under Q = 561.4–1598.6 m3/h. The results show that the efficiency and the head of the guide vanes scheme are lower under Q = 800–1200 m3/h, which resulted from a higher total entropy production (TEP) in the pumping chamber and outlet pipe. The high total entropy production rate (TEPR) inside the guide vanes can be found near the leading edge of the hub side and trailing edge of the rim side due to flow separation, which reduces the recovery efficiency of kinetic energy of the guide vanes. The high TEPR inside outlet pipe can be seen near the inlet, caused by back flow. However, the efficiency and head of the volute scheme are lower, under Q = 1200–1600 m3/h, owing to the fact that the volute cannot effectively convert kinetic energy into pressure energy and thus the high TEPR can be found near outlet of volute and inlet of outlet pipe. These results can provide useful suggestions to the matching optimization of the impeller and pumping chamber in a mixed-flow pump.

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“…4 In general, there are four approaches to evaluate these characteristics, namely empirical or statistical formula, simple flow model, computational fluid dynamics (CFD), and experiments, and the evaluation accuracy increases in turn. 5 Even though the theoretical flow model cannot produce good results as CFD occasionally, 6 it is still a popular method to calculate pump characteristics at the preliminary pump design stage because of its fast and interactive solutions. However, in the current literature, the radial wall shear stress is neglected in simplified flow models of pump side chambers.…”

Section: Introductionmentioning

confidence: 99%

A Flow Model for Side Chambers of Centrifugal Pumps Considering Radial Wall Shear Stress

Cheng

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The side chamber flow has a fundamental influence on the performance and reliability of centrifugal pumps. However, the radial wall shear stress in the flow modelling of pump side chambers is arbitrarily neglected. The current work proposes a model for the radial wall shear stress, which is an extension of the previous paper (DOI: 10.1115/1.4047532). By using the power-law for the velocity boundary layer and the Blasius law for the wall shear stress, introducing the Ekman layer thickness expression, and deducing the Bödewadt layer thickness expression, the radial wall shear stress on the rotating and stationary disks is formulated and then integrated into the side chamber flow model. Besides, the entire flow field of the centrifugal pump is solved using the computational fluid dynamics (CFD) software ANSYS CFX. The radial wall shear stress calculated by the new side chamber flow model (NSCFM) is in the identical magnitude as CFD. Compared with pressure measurements, NSCFM makes better pressure predictions than CFD from the rear seal to the hub; however, in other areas, CFD results are closer to experimental data than NSCFM results. The flow prediction tools show that the volumetric efficiency and the shroud thrust increase with the increase in flow rate. NSCFM achieves a good compromise between calculation speed and desired accuracy.

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Energy loss analysis of the double-suction centrifugal pump under different flow rates based on entropy production theory

Cited by 25 publications

References 36 publications

Energy Loss and Radial Force Variation Caused by Impeller Trimming in a Double-Suction Centrifugal Pump

Energy Loss and Radial Force Variation Caused by Impeller Trimming in a Double-Suction Centrifugal Pump

The Influence of a Pumping Chamber on Hydraulic Losses in a Mixed-Flow Pump

A Flow Model for Side Chambers of Centrifugal Pumps Considering Radial Wall Shear Stress

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