Effects of clearance flow on the characteristics of centrifugal pump under low flow rate

Zheng, Lulu; Chen, Xiaoping; Dou, Hua-Shu; Zhang, Wei; Zhu, Zuchao; Cheng, Xueli

doi:10.1007/s12206-019-1220-2

Cited by 19 publications

(4 citation statements)

References 40 publications

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“…The distribution of pressure shown in Figure 5 also demonstrates the numerical results are also reliable. The pressure coefficient [35] is defined as follows:…”

Section: Numerical Approach and Cfd Validationmentioning

confidence: 99%

Evolution Characteristics of Energy Change Field in a Centrifugal Pump during Rapid Starting Period

Chen

Zhang

2022

Energies

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Although the energy change field in the centrifugal pump has been investigated under quasi-steady conditions (QSC), equivalent information is not yet known during the rapid starting period (RSP). A centrifugal pump loop system is constructed to investigate the energy change field in the centrifugal pump during RSP. The RSP is selected as a linear rotational speed from 0 rev/min to 2900 rev/min (design rotational speed) and a constant valve opening of 0.569. Results show that the flow rate lags behind the pump head value with the linear increase in rotational speed. The large values of partial derivations of mechanical energy in normal and tangential components are mainly concentrated at the impeller outlet, whose position is insensitive to rotational speed. The region of dominant energy loss is negatively correlated with rotational speed, and an opposite phenomenon is observed in the region of dominant energy increase. With the rotational speed increasing, the mean energy gradient function in the pump impeller and pump volute gradually increases, and the slope of the former is less than that of the latter. After reaching the design rotational speed, the energy change field gradually approaches that under quasi-steady conditions.

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“…The distribution of pressure shown in Figure 5 also demonstrates the numerical results are also reliable. The pressure coefficient [35] is defined as follows:…”

Section: Numerical Approach and Cfd Validationmentioning

confidence: 99%

Evolution Characteristics of Energy Change Field in a Centrifugal Pump during Rapid Starting Period

Chen

Zhang

2022

Energies

Self Cite

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“…Peng et al (Peng et al, 2020) analyzed the effect of the blade outlet setting angle on the performance of the low specific speed multistage deep well pump, and found that increasing the blade outlet setting angle would lead to more cavitation on the impeller. Tanaka et al (Tanaka et al, 2021) used a simulation method to study the transient characteristics of a centrifugal pump during rapid start-up, and compared with the experimental results; Zheng et al (Zheng et al, 2020) found that under the condition of small flow, the gap flow will lead to the performance degradation of centrifugal pump. Cheng et al (Cheng et al, 2019) found that appropriately increasing the wrap angle of the space diffuser can improve the flow characteristics within the space diffuser.…”

Section: Introductionmentioning

confidence: 99%

Investigation of high-speed deep well pump performance with different outlet setting angle of space diffuser

Cao¹,

Zhang²,

Cao³

et al. 2023

Front. Energy Res.

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As one of the important equipment for pumping groundwater, how to improve the operation performance of deep well pump has been a research hotspot. At present, most of the deep well pump hydraulic design research mainly focuses on the low speed condition, and there is still a lack of systematic research on the internal flow theory and design method of the high speed deep well pump. In this paper, numerical simulation is used to investigate the performance change law of high speed deep well pump under different space diffuser blade outlet setting angles, and the performance test of the design scheme model is used to verify the accuracy of numerical simulation. The hydraulic loss inside the space diffuser and the velocity moment at the outlet are quantitatively analyzed. The results shown that the outlet setting angle of 90° is a relatively optimal solution. Under the designed outlet setting angle, the hydraulic loss in the first-stage space diffuser decreases with the increase of the flow rate, and the average hydraulic loss in the space diffuser at all levels fluctuates between 16% and 20%. With the increase of the number of stages, the velocity moment at the outlet of the space diffuser also increases gradually, and the change trend of the velocity moment at the outlet of the first-stage space diffuser under different outlet setting angles is relatively consistent. This research can provide reference for the optimal design and application of high speed deep well pump.

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“…The process of stress characterization encompasses the interplay between fluid and solid domains, typically employing a coupled fluid-structure methodology. Currently, more studies use the coupling of Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) for fluid-structure interaction [6][7][8]. CFD is used to simulate the flow inside the fluid, while the FEA method is used to analyze the structural response of the pump.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Stress Characteristics of a Vertical Centrifugal Pump Based on Fluid-Structure Interaction

Li,

Tu,

et al. 2023

Water

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Vertical centrifugal pumps play a crucial role in numerous water conservancy projects. However, their continuous operation can lead to the development of cracks or even fractures in some centrifugal pump blades, resulting in a substantial adverse impact on the operation of the pumping station unit and jeopardizing safe production. This study employs the fluid-structure interaction method to comprehensively investigate the modal characteristics of the impeller, both in an air environment and immersed in water. Furthermore, the analysis of static and dynamic stress attributes is conducted. The natural frequency of the impeller when submerged in water is significantly lower than its frequency in an air medium, typically accounting for approximately 0.35 to 0.46 of the air-based natural frequency. There are conspicuous stress concentrations at specific locations within the system, specifically at the rounded corners of the blade back exit edge, the impeller front cover, the middle of the blade inlet edge, and the junction where the blade interfaces with the front and back cover. It is crucial to underscore that when the system operates under high-flow or low-flow conditions, there is a pronounced stress concentration at the interface between the impeller and the rear cover plate. Any deviation from the intended design conditions results in an escalation of equivalent stress levels. Through dynamic stress calculations during a single rotational cycle of the impeller, it is discerned that the cyclic nature of stress at the point of maximum stress is primarily influenced by the number of blades and the rotational velocity of impeller. This research carries significant implications for effectively mitigating blade fractures and cyclic fatigue damage, thereby enhancing the operational reliability of vertical centrifugal pumps in water conservancy applications.

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Effects of clearance flow on the characteristics of centrifugal pump under low flow rate

Cited by 19 publications

References 40 publications

Evolution Characteristics of Energy Change Field in a Centrifugal Pump during Rapid Starting Period

Evolution Characteristics of Energy Change Field in a Centrifugal Pump during Rapid Starting Period

Investigation of high-speed deep well pump performance with different outlet setting angle of space diffuser

Analysis of Stress Characteristics of a Vertical Centrifugal Pump Based on Fluid-Structure Interaction

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