Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Zhang, Yuliang; Xiao, Jian; Yu, Jianping; Ji, Yingyu

doi:10.1155/2014/782619

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…They think that particles mainly flow along the pressure surface in the impeller. However, the laws obtained in this paper are consistent with those obtained in most literatures (Zhang et al , 2013, 2014). The simulated results obtained in this paper are also consistent with the experimental results as shown in Figure 19(f).…”

Section: Resultssupporting

confidence: 92%

“…A transient numerical simulation was carried out for the solid-liquid flow in a centrifugal pump Transition process of a molten salt pump by DEM-CFD coupling (Huang et al, 2015). The steady solid-liquid two-phase flow in a centrifugal pump was analyzed by using a CFD code based on the mixture model and the RNG k-« two-equation turbulence model (Zhang et al, 2013;Zhang et al, 2014). The solid-liquid twophase flow fields were investigated in the non-clogging centrifugal pump with a doublechannel impeller for the design condition and also off-design conditions by numerical simulation (Zhao et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Study on the transition process of a molten salt pump transporting media with crystalline particles by modeling test and numerical simulation

Shao

Zhang

et al. 2019

HFF

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Purpose The purpose of this paper is to study the transition process from the crystalline particles appearing before the pump inlet to the stable operation of the pump. Design/methodology/approach Firstly, a modeling test method was put forward for the high-temperature molten salt pump. Then, according to a modeling test scheme, the experiment of the solid–liquid two-phase flow was carried out by using a model pump similar to the prototype pump. Meanwhile, the numerical method to simulate the transition process of a molten salt pump was studied, and the correctness of the numerical model was verified by the experimental results. Finally, the transition process of the molten salt pump was studied by the verified numerical model in detail. Findings In the simulation of the transition process, it is more accurate to judge the end of the transition process based on the unchanged particle volume fraction (PVF) at the pump outlet than on the periodic fluctuation of the outlet pressure. The outlet pressure is closely related to the PVF in the pump. The variation of the outlet pressure is slightly prior to that of the PVF at the pump outlet and mainly affected by the PVF in the impeller and volute. After 0.63 s, the PVF at each monitoring point changes periodically, and the time-averaged value does not change with time. Practical implications This study is of great significance to further improve the design method of molten salt pump and predict the abrasion characteristic of the pump due to interactions with solid particles. Originality/value A numerical method is established to simulate the transition process of a molten salt pump, and a method is proposed to verify the numerical model of two-phase flow by modeling test.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Study on the transition process of a molten salt pump transporting media with crystalline particles by modeling test and numerical simulation

Shao

Zhang

et al. 2019

HFF

View full text Add to dashboard Cite

show abstract

“…Zhang et al (2013) experimentally studied the transient behavior of a prototype centrifugal pump with an open impeller during rapid startup periods. Zhang et al (2014) also numerically simulated the transient flows inside the pump during the startup period using the dynamic slip region method to determine the transient startup characteristics of a high specific-speed prototype centrifugal pump delivering the two-phase gas–liquid flow. Furthermore, Zhang et al (2015) still used commercial code FLUENT to simulate the unsteady flows inside a pump during the startup period using a low specific-speed centrifugal pump to transport pure water and the two-phase solid–liquid flow, and then compared the numerical results with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Fluid-structure interaction study of a mixed-flow pump impeller during startup

Shi

et al. 2018

Engineering Computations

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Purpose The purpose of this paper is to experimentally and numerically study the transient hydraulic impact and overall performance during startup accelerating process of mixed-flow pump. Design/methodology/approach In this study, the impeller rotor vibration characteristics during the starting period under the action of fluid–structure interaction was investigated, which is based on the bidirectional synchronization cooperative solving method for the flow field and impeller structural response of the mixed-flow pump. Experimental transient external characteristic and the transient dimensionless head results were compared with the numerical calculation results, to validate the accuracy of numerical calculation method. Besides, the deformation and dynamic stress distribution of the blade under the stable rotating speed and accelerating condition were studied based on the bidirectional fluid–structure interaction. Findings The results show that the combined action of complex hydrodynamic environment and impeller centrifugal force in the startup accelerating process makes the deformation and dynamic stress of blade have the rising trend of reciprocating oscillation. At the end of acceleration, the stress and strain appear as transient peak values and the transient effect is nonignorable. The starting acceleration has a great impact on the deformation and dynamic stress of blade, and the maximum deformation near the rim of impeller outlet edge increases 5 per cent above the stable condition. The maximum stress value increases by about 68.7 per cent more than the steady-state condition at the impeller outlet edge near the hub. The quick change of rotating speed makes the vibration problem around the blade tip area more serious, and then it takes the excessive stress concentration and destruction at the blade root. Originality/value This study provides basis and reference for the safety operation of pumps during starting period

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Experimental and simulation analyses of the hydraulic complex internal flow characteristics in an axial pump based on varying frequency vibration ranges technique

Al-Obaidi,

Alhamid

2024

Int J Interact Des Manuf

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Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Cited by 7 publications

References 11 publications

Study on the transition process of a molten salt pump transporting media with crystalline particles by modeling test and numerical simulation

Study on the transition process of a molten salt pump transporting media with crystalline particles by modeling test and numerical simulation

Fluid-structure interaction study of a mixed-flow pump impeller during startup

Experimental and simulation analyses of the hydraulic complex internal flow characteristics in an axial pump based on varying frequency vibration ranges technique

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