Influence of Balance Hole Diameter on Leakage Flow of the Balance Chamber in a Centrifugal Pump

Dong, Wei; Chen, Diyi; Sun, Jian Heng; Dong, Yizhe; Yang, Zhenbiao; Yan, Junle

doi:10.1155/2021/8860493

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…In the process of cavitation, the interaction of gas-liquid two phases makes the internal cavitation process more complex, and the theoretical defects make it impossible for further improvement. Therefore, scholars at home and abroad have carried out a large number of numerical simulations and experimental studies on centrifugal pumps, obtained plenty of cavitation parameters, and achieved some results [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Centrifugal Pump Cavitation Based on ANSYS

Dong

Li²

2023

J. Phys.: Conf. Ser.

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Centrifugal pump is the key equipment in petrochemical, agriculture, shipbuilding and other industries. Its safe, reliable and reliable work is an important guarantee to ensure its normal operation. Cavitation is a kind of unsteady compressible turbulent flow, which has a great influence on its performance and efficiency due to material exchange between gas and liquid phases. The appearance of the impeller internal cavitation phenomenon will reduce the pump head and efficiency, which is caused by the impeller and other flow components of damage, causing greater noise, and thereby the pump work and work performance have been greatly affected. Improving the efficiency of the centrifugal pump will undoubtedly reduce the social requirements for energy, which is consistent with the current goal of energy conservation and emission reduction advocated by society. The performance and efficiency of a centrifugal pump can be improved effectively by numerical simulation and analysis of the cavitation phenomenon.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Centrifugal Pump Cavitation Based on ANSYS

Dong

Li²

2023

J. Phys.: Conf. Ser.

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“…1 At present, the theoretical calculation formula of the axial force in the front and the rear cavity of the centrifugal pump is regarding the rotational angular velocity of the flow in the pump cavity as half of the impeller rotational angular velocity, 2 however, this assumption is the main reason of the theoretical calculation error for the axial force. 3–6 Based on the fluid around the impeller has different circumferential angular velocity, Lu et al 7 deduced the axial force calculation formula through reducing the diameter of the impeller back shroud, and the accuracy of the theoretical formula was verified by experiments. He et al 8 found that there is an error between the traditional theoretical formula of axial force and the experimental value of axial force during the axial force test of a single-stage model of seawater desalination multistage pump, while the trend was basically the same.…”

Section: Introductionmentioning

confidence: 99%

Flow mechanism and axial force distribution characteristics of multistage pump cavity

Chen

Lihuan

Peng³

et al. 2022

Science Progress

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The gap leakage between the impeller ring leads to the change of the pump cavity flow characteristics, resulting in the uneven pressure distribution of shroud, which causes the axial force of the cavity to change. In this paper, the flow in the front and the rear cavity of the multistage centrifugal pump was taken as the research object. Through the numerical method, the radial flow velocity, the leakage flow size and its direction, the core zone rotation factor of the front and the rear cavity of the multistage pump impeller at all stages and the axial force of pump cavity were studied. The results show that the leakage in the front cavity of multistage pump impeller at all stages flows inward along radial direction (i.e. it flows from the inlet of pump cavity to the front ring clearance). The rotation factor in core zone is higher than 0.5, and with the increase of rotation factor, the axial force of the front pump cavity increased. The leakage in the rear pump cavity flows outward along radial direction (i.e. it flows from the rear ring to the inlet of pump cavity). The rotation factor in core zone is less than 0.5, and with the increase of rotation factor, the axial force decreased gradually. Besides, the radial velocity and rotation factor in the front and the rear multistage pump of impellers were obviously along the axial direction at three regions, the regions are pump case boundary layer, core zone and impeller boundary layer. The flow in the core zone is dominated by circumferential circular motion, and the radial velocity in the core zone is 0. It is shown that the direction of the leakage in the pump cavity and the rotation effect of the flow micelle in the mainstream core zone are the main factors affecting the axial force of the pump cavity, and the research results can provide theoretical guidance for the calculation and suppression of axial force of multistage pumps.

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Effects of the Balance Hole Diameter on the Flow Characteristics of the Rear Chamber and the Disk Friction Loss in the Centrifugal Pump

et al. 2022

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This paper studies the flow characteristics and disk friction loss of the rear chamber in a centrifugal pump at a design flow condition with six values of the balance holes at diameters from 0 to 12 mm. The results show that the turbulent boundary layer in the rear chamber is greatly affected by the leakage flow. When the balance hole diameter increases, the flow characteristics of the rear chamber is mainly restricted by the mainstream flow field of the volute. However, when the balance hole diameter is larger than the design value, the disk friction loss of the rear chamber remains basically unchanged. On the contrary, when the balance hole diameter is smaller than the design value, the larger the balance hole diameter the smaller the friction loss of the disk in the rear chamber area. The results of this paper provide a reference for reducing axial force and stable operation of a centrifugal pump.

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Influence of Balance Hole Diameter on Leakage Flow of the Balance Chamber in a Centrifugal Pump

Cited by 3 publications

References 29 publications

Numerical Simulation of Centrifugal Pump Cavitation Based on ANSYS

Numerical Simulation of Centrifugal Pump Cavitation Based on ANSYS

Flow mechanism and axial force distribution characteristics of multistage pump cavity

Effects of the Balance Hole Diameter on the Flow Characteristics of the Rear Chamber and the Disk Friction Loss in the Centrifugal Pump

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