Investigation on characteristics of pressure fluctuation in a centrifugal pump with clearance flow

Zheng, Lulu; Chen, Xiaoping; Zhang, Wei; Zhu, Zuchao; Qu, Jinglei; Wang, Mengmeng; Ma, Xiaojie; Cheng, Xueli

doi:10.1007/s12206-020-0818-8

Cited by 16 publications

(8 citation statements)

References 31 publications

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“…Figure 3 shows the meshes of the loop system, including the centrifugal pump, valve, cistern, and cylindrical pipes. The mesh independence of the centrifugal pump has been verified by Zheng et al [34], and To investigate the RSP effects, six numerical simulations of the centrifugal pump loop system under QSC are also performed. Based on the constant valve opening, the rotational speeds in QSC are also constant, including n d /6, 2n d /6, 3n d /6, 4n d /6, 5n d /6, and n d .…”

Section: Geometric Model and Mesh Generationmentioning

confidence: 95%

“…Figure 3 shows the meshes of the loop system, including the centrifugal pump, valve, cistern, and cylindrical pipes. The mesh independence of the centrifugal pump has been verified by Zheng et al [34], and the adopted number is 6.59 million. In addition, the valve has 1.2 million meshes, the cistern has 2.98 million, and the pipeline has 4.35 million.…”

Section: Geometric Model and Mesh Generationmentioning

confidence: 95%

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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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Section: Geometric Model and Mesh Generationmentioning

confidence: 95%

“…Figure 3 shows the meshes of the loop system, including the centrifugal pump, valve, cistern, and cylindrical pipes. The mesh independence of the centrifugal pump has been verified by Zheng et al [34], and the adopted number is 6.59 million. In addition, the valve has 1.2 million meshes, the cistern has 2.98 million, and the pipeline has 4.35 million.…”

Section: Geometric Model and Mesh Generationmentioning

confidence: 95%

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

Chen

Zhang

2022

Energies

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“…Zhao et al 4 analyzed the stall propagation mechanism and found that the flow separation occurs near the leading edge of the pressure surface and transforms into vortex along the channel. Zheng et al 5 found that the main frequency amplitude of impeller inlet pressure fluctuation increases with the increase in flow, and the opposite trend is observed in the clearance area of wear ring. Gao et al 6 confirmed that reasonable trailing edge of centrifugal pump impeller blade can effectively reduce pressure pulsation.…”

Section: Introductionmentioning

confidence: 99%

Effects of oscillation frequency on the flow characteristics of a centrifugal pump impeller with sinusoidal flow rate

Kuang

Liu

Chen

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study uses large eddy simulation to investigate the flow characteristics of a centrifugal pump impeller with sinusoidal flow rate and constant rotational speed. Five different oscillation frequencies ( f/f0 = 1.0, 1.2, 1.5, 2.0, and 3.0, where f0 indicates one-ninth of the rotational speed) are selected to isolate the influence of oscillation frequency on the flow characteristics. Studies show that the pressure deviation between dropping and rising stages concentrates at the impeller inlet at instantaneous 0.5 Qd ( Qd is the design load), and its value increases with the increase in oscillation frequency. The lowest period of many flow characteristics, including pressure fluctuation and head, equals to that of flow rate. The differences in pressure fluctuation between adjacent channels decreases with the increase in oscillation frequency. The first and second dominant frequencies of pressure fluctuation are mainly affected by the oscillation frequency in the nonstall passage, and they have an important relationship with the stall vortex in the stall passage. With the increase in oscillation frequency, the amplitude of lowest order head pulsation increases, and the high order head pulsation gradually weakens. The average head is approximately 2.36 m.

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“…Ni [9] found that the coupling between the rotor-stator interaction and the collision of the fluid discharged from the diffuser with the circulating flow to the casing bottom is the main cause of the strong pressure pulsation. Zheng et al [10] found that the dominant frequency amplitude of the pressure fluctuation at the impeller inlet increased with the flow rate increase, whereas an inverse trend was observed at the wear ring clearance region. Gao et al [11] found that a reasonable blade trailing edge of a centrifugal pump impeller can effectively reduce pressure pulsation.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Periodic Transient Pressure Fluctuation in a Centrifugal Pump Impeller at Low Flow Rate

et al. 2021

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This paper presents a large eddy simulation of a centrifugal pump impeller during a transient condition. The flow rate is sinusoidal and oscillates between 0.25Qd (Qd indicates design load) and 0.75Qd when the rotating speed is maintained. Research shows that in one period, the inlet flow rate will twice reach 0.5Qd, and among the impeller of one moment is a stall state, but the other is a non-stall state. In the process of flow development, the evolution of low-frequency pressure fluctuation shows an obviously sinusoidal form, whose frequency is insensitive to the monitoring position and equals to that of the flow rate. However, inside the impeller, the phase and amplitude in the stall passages lag behind more and are stronger than that in the non-stall passages. Meanwhile, the strongest region of the high-frequency pressure fluctuation appears in the stall passages at the transient rising stage. The second dominant frequency in stall passages is 2.5 times to that in non-stall passages. In addition, similar to the pressure fluctuation, the evolution of the low-frequency head shows a sinusoidal form, whose phase is lagging behind that by one-third of a period in the inlet flow rate.

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Investigation on characteristics of pressure fluctuation in a centrifugal pump with clearance flow

Cited by 16 publications

References 31 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

Effects of oscillation frequency on the flow characteristics of a centrifugal pump impeller with sinusoidal flow rate

Large Eddy Simulation of Periodic Transient Pressure Fluctuation in a Centrifugal Pump Impeller at Low Flow Rate

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