Numerical analysis of the flow mechanism and axial force characteristics of the cavity in a centrifugal pump with a front inducer

Zhang, Haichen; Dong, Wei; Chen, Diyi

doi:10.21595/jve.2020.21179

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Liu et al 22 explored the number of balance holes, diameter and other parameters on the rear pump chamber pressure and axial force, found that when the number of balance holes and the number of vanes is the same, the more the balance of the axial force; balance holes in a certain range of the diameter increases, the pressure at the same location in the pump chamber will subsequently decrease. Zhang et al 23 conducted a numerical analysis on the radial distribution of fluid axial velocity in center of the pump chamber at different angles, as well as the radial distribution of fluid pressure in the pump chamber from different angles. The influence of the pump chamber on the hydraulic performance of mixed flow pumps was also studied 24 .…”

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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“…Zhang et al [2] showed that there are multi-scale distributions in the internal flow structure of centrifugal pumps, and the flow energy distribution in centrifugal pumps with better hydraulic performance is more concentrated in high-order and small-scale flow structures. Zhang et al [3] discussed the influence of flow conditions on the liquid flow mechanism in the pump chamber and found that the vortex in the pump chamber is mainly concentrated near the volute and hub.…”

Section: Introductionmentioning

confidence: 99%

Influence of Axial Matching between Inducer and Impeller on Energy Loss in High-Speed Centrifugal Pump

Cui

2023

JMSE

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Studying the axial matching between the inducer and impeller is crucial for optimizing the structure of centrifugal pumps. In this paper, the SST k-ω turbulence model is used to analyze the influence of three axial positions on the internal flow and the energy loss of a centrifugal pump. Additionally, the entropy generation method is used to evaluate the energy loss in the pump. Three sets of inducer design schemes are selected based on the ratio of the distance from the trailing edge of the inducer to the impeller inlet and the impeller inlet diameter, which are λ = 0.6, λ = 0.9 (original scheme), and λ = 1.2, respectively. The results indicate that changing the axial position of the inducer between λ = 0.6 and λ = 1.2 has only a negligible effect on the overall performance of the centrifugal pump. At flow rates of 0.6Qd and 1.0Qd, the inlet pressure coefficient of λ2 is significantly lower compared to λ1 and λ3. As the flow rate increases, the pressure coefficient difference between the inlet and outlet in the inducer decreases, which leads to a more uniform streamline distribution and better development of the vortex in the flow channel. The energy loss in the inducer mainly occurs at the rim, the trailing edge, and outlet near the wall. As the flow rate increases, the entropy generation rate at the inducer rim decreases slightly and remains around 1000 W·m−3·K−1. At flow rates of 1.0Qd and 1.2Qd, the energy loss in the impeller reduces as the axial distance increases, with the exception of the flow rate 0.6Qd.

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“…Yang et al [17] studied the clocking effect between the inducer and impeller in a high-speed centrifugal pump and obtained the best performance when the relative angle between the inducer trailing edge and impeller leading edge was 0 • . Several pump designers used inducers at the upstream of the impeller to reduce pump cavitation [18][19][20][21][22]. Although inducers were used in centrifugal pumps for decades, they are not commonly found in multistage centrifugal pumps.…”

Section: Introductionmentioning

confidence: 99%

Effect of an Inducer-Type Guide Vane on Hydraulic Losses at the Inter-Stage Flow Passage of a Multistage Centrifugal Pump

Shamsuddeen

Kim

et al. 2021

Processes

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A multistage centrifugal pump was developed for high head and high flow rate applications. A double-suction impeller and a twin-volute were installed at the first stage followed by an impeller, diffuser and return vanes for the next four stages. An initial design feasibility study was conducted using three-dimensional computational fluid dynamics tools to study the performance and the hydraulic losses associated with the design. Substantial losses in head and efficiency were observed at the interface between the first stage volute and the second stage impeller. An inducer-type guide vane (ITGV) was installed at this location to mitigate the losses by reducing the circumferential velocity of the fluid exiting the volute. The ITGV regulated the pre-swirl of the fluid entering the second stage impeller. The pump with and without ITGV is compared at the design flow rate. The pump with ITGV increased the stage head by 63.28% and stage efficiency by 47.17% at the second stage. As a result, the overall performance of the pump increased by 5.78% and 3.94% in head and efficiency, respectively, at the design point. The ITGV has a significant impact on decreasing losses at both design and off-design conditions. An in-depth flow dynamic analysis at the inducer-impeller interface is also presented.

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Numerical analysis of the flow mechanism and axial force characteristics of the cavity in a centrifugal pump with a front inducer

Cited by 5 publications

References 17 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

Influence of Axial Matching between Inducer and Impeller on Energy Loss in High-Speed Centrifugal Pump

Effect of an Inducer-Type Guide Vane on Hydraulic Losses at the Inter-Stage Flow Passage of a Multistage Centrifugal Pump

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