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

Dong, Wei; Liu, Ze; Zhang, Haichen; Zhang, Guang; Jiang, Haoqing; Li, Peixuan

doi:10.3390/pr10030613

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…Jin et al 16 conducted numerical calculations on the entire flow field of the molten salt pump and analyzed the velocity distribution and energy loss inside the front and rear chambers of a pump, found that the proportion of loss in the front and rear cover plate pump chambers to the total energy consumption and the ratio of loss energy decreased with increasing flow. Dong et al 17 found that the change in the diameter of the balance hole has a significant impact on the flow characteristics and disk friction loss in the rear chamber of a centrifugal pump under the rated operating condition. It is also found that the pressure distribution in rear chamber is affected by the shape of the volute, and the difference in different angles is significant 18 .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of flow characteristics in the front and rear chambers of centrifugal pump and pump as turbine

Zhang,

Zheng,

Zhao

2024

Sci Rep

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To investigate the flow characteristics in front chamber and rear chamber in pump mode and pump as turbine mode, a 3D computational model of a centrifugal pump was established, including the front and rear chamber. Based on Realizable k-ε turbulence model, numerical calculations of incompressible flow were carried out for internal viscous flow in two operating modes. Further analysis was conducted on the flow stability and hydraulic losses under two modes using energy gradient theory and entropy production theory. The numerical simulation results are within reasonable error compared to the experimental results in pump operation mode, which ensures the reliability of the numerical calculation method. The results indicate that the volumetric efficiency in both two modes is on an upward trend with increasing flow, but the volumetric efficiency of the pump mode is more significantly affected by changes in flow; the distribution patterns of dimensionless circumferential velocity and dimensionless radial velocity in the front and rear chambers under two operating modes are similar, but the distribution pattern of dimensionless radial velocity in the front chamber in turbine mode is significantly different from other operating conditions; flow instability is most likely to occur at the outlet of impeller, and the energy loss in clearance of wear-rings is greater than that in the pump chamber.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of flow characteristics in the front and rear chambers of centrifugal pump and pump as turbine

Zhang,

Zheng,

Zhao

2024

Sci Rep

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“…Arka bölmedeki türbülanslı sınır tabakasının sızıntı akışından büyük ölçüde etkilendiği sonucuna ulaşmışlardır. Dengeleme deliği çapının; tasarım değerinden daha büyük olduğu durumda arka bölmenin disk sürtünme kaybının değişmediğini, tasarım değerinden daha küçük olduğu durumda ise, delik çapı küçüldükçe arka bölgedeki diskin sürtünme kaybının arttığını tespit etmişlerdir [20].…”

Section: Introductionunclassified

Deneysel Tasarım Yöntemleri İle Bir Santrifüj Pompa Çarkında Dengeleme Deliği Tasarım Optimizasyonu

SEFACI¹,

Babayigit

KOÇAK

2022

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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The aim of this study is to determine the optimal balancing hole to be drilled into the pump impeller in order to extend the bearing life by reducing the axial forces exposed on the bearings. In this study, as well as reduction of the axial forces, the changes in the pump efficiency are also considered. For this study, a single-stage centrifugal pump having a 1450 rpm speed, 350 m³/h flow rate and 51 m head is chosen. It is foreseen to optimize the design optimization of the balancing holes on the selected pump impeller is implemented by using the method of experimental design and Computational Fluid Dynamics (CFD). Ansys Fluent software is used for CFD analysis. In order to reach the optimum results, four parameters including the hole center angle, hole diameter, hole center diameter and number of balancing holes in the impeller are selected, and the optimization study is carried out by using Multi-Objective Taguchi Method. Low axial force and high pump efficiency are accepted as objectives. CFD results are evaluated according to the analysis of variance (ANOVA) and signal/noise (S/N) ratio. As a result, it is determined that the hole diameter is the most effective parameter on these objectives. The optimum design parameters are found to be 0°, 12 mm, 100 mm and 6 for the parameters given above, respectively.

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Analysis on axial force characteristics of variable valve and variable speed adjustment of centrifugal pump

Dong,

Jiang,

Zhang

et al. 2024

Physics of Fluids

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In order to study the evolution mechanism of axial force characteristics of centrifugal pump in the transient process of variable working conditions, the IS80-65-160 centrifugal pump is taken as the research object, and four flow operating points of centrifugal pump 1.0Qr, 0.8Qr, 0.6Qr, and 0.4Qr are selected. Non-constant numerical simulation is carried out, and on the basis that the numerical calculation results of the external characteristics are basically consistent with the experimental results, the changes of the axial force of the impeller during the flow reduction process of the variable valve adjustment and the variable speed adjustment of the centrifugal pump are studied, respectively. The results show that as the flow rate decreases, the force of the variable valve regulating impeller cover plate increases, and the force of the variable speed regulating cover plate decreases. Under the two adjustment methods, the axial force on the pressure surface of the blade becomes smaller, the axial force on the suction surface of the blade is basically unchanged, and the pulsation coefficient of the impeller axial force increases first and then decreases. The axial force pulsation coefficient reaches the maximum value in the variable valve adjustment condition of 0.8Qr and the variable speed adjustment condition of 0.6Qr, respectively, and the axial force on the outer wall of impeller cover plate has the greatest influence on the main frequency axial force ripple coefficient; the axial force acting on the outer wall surface of the front cover plate of the impeller and the inner wall surface of the front and rear cover plates increases with the increase in the radius, The axial force acting on the outer wall surface of the rear cover plate of the impeller has axisymmetrical properties. This study revealed the evolution mechanism of the axial force characteristics of the centrifugal pump impeller during the transient process of variable working conditions, and the research results can provide a reference for improving the stable operation of the centrifugal pump.

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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

Cited by 4 publications

References 26 publications

Numerical investigation of flow characteristics in the front and rear chambers of centrifugal pump and pump as turbine

Numerical investigation of flow characteristics in the front and rear chambers of centrifugal pump and pump as turbine

Deneysel Tasarım Yöntemleri İle Bir Santrifüj Pompa Çarkında Dengeleme Deliği Tasarım Optimizasyonu

Analysis on axial force characteristics of variable valve and variable speed adjustment of centrifugal pump

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