Study on Design of Air-water Two-phase Flow Centrifugal Pump Based on Similarity Law

Matsushita, Nobuhiro; Furukawa, Akinori; Watanabe, Satoshi; Okuma, Kusuo

doi:10.5293/ijfms.2009.2.2.127

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…Other contributions, like Schäfer et al [15] and Neunann et al [16], performed investigations using gamma-ray tomography techniques to find local discontinuities in pump characteristics. Furukawa et al [17] and Matushita et al [18] tested flow visualizations on a specific pump design with a tandem blade impeller set-up. Among them, most of the tested pump models used two-dimensional blade shapes transparent shroud impellers and paid little attention to the rotor-stator interaction (RSI) area.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations on the Inner Flow Behavior of Centrifugal Pumps under Inlet Air-Water Two-Phase Conditions

Zhang

Bois

et al. 2019

Energies

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Centrifugal pumps are widely used and are known to be sensitive to inlet air-water two-phase flow conditions. The pump performance degradation mainly depends on the changes in the two-phase flow behavior inside the pump. In the present paper, experimental overall pump performance tests were performed for two different rotational speeds and several inlet air void fractions (αi) up to pump shut-off condition. Visualizations were also performed on the flow patterns of a whole impeller passage and the volute tongue area to physically understand pump performance degradation. The results showed that liquid flow modification does not follow head modification as described by affinity laws, which are only valid for homogeneous bubbly flow regimes. Three-dimensional effects were more pronounced when inlet void fraction increased up to 3%. Bubbly flow with low mean velocities were observed close to the volute tongue for all αi, and returned back to the impeller blade passages. The starting point of pump break down was related to a strong inward reverse flow that occurred in the vicinity of the shroud gap between the impeller and volute tongue area.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigations on the Inner Flow Behavior of Centrifugal Pumps under Inlet Air-Water Two-Phase Conditions

Zhang

Bois

et al. 2019

Energies

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“…Figure 1 shows the axial flow pump model, which consists of four IGVs, four impellers, and seven DVs. Applying the similarity law [10][11][12][13][14][15], the actual model is scaled down eight times to save time and computer resources. Some main parameters of the pump model are shown in table 1.…”

Section: Axial-flow Pump Modelmentioning

confidence: 99%

Validation of the steady and unsteady simulation based on an axial-flow pump

Nguyen,

Kim,

Jeong

et al. 2024

J. Phys.: Conf. Ser.

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An axial-flow pump offers high flow rates and efficiency with low power consumption, making it ideal for applications that require transferring the large volume of fluid. Applying the numerical simulation in predicting hydraulic performance, analyzing the phenomena, and optimizing the design of the axial flow pump is very cost-effective and flexible. This study is performed to clarify the difference between steady and unsteady simulations based on the axial flow pump. Numerical simulations are carried out using the steady and unsteady Reynolds-averaged Navier-Stokes (RANS and URANS) equations and a shear stress transport reattachment modification turbulence model with small y+ values at all wall surfaces. To show the accuracy, numerical simulations are analyzed and compared with testing results. The difference in steady and unsteady simulations is presented by a detailed analysis of the flow field under the deep stall condition. The result shows that the numerical and testing results are in good agreement with each other. However, the unsteady results are more accurate than the steady results, especially in the saddle zone. Under deep stall condition, it is difficult to accurately predict the hydraulic performance and fluid flow characteristics inside the axial flow pump through steady simulation because of the time-dependent flow.

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“…Successful impeller and vane diffuser specific sets of designs are achieved by the same research group (Furukawa et al [32,33]). Some extensions are also proposed by Matsushita et al ([34,35]) looking at possible application of similarity laws for such designs. They all presented interesting studies, developing different kind of tandem arrangement cascades and blades as shown in Figure 12.…”

Section: Particular Impeller Pump Designsmentioning

confidence: 99%

A Review of Design Considerations of Centrifugal Pump Capability for Handling Inlet Gas-Liquid Two-Phase Flows

et al. 2019

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Most of the pumps working under two phase flows conditions are used in petroleum industry applications, like electrical submersible pumps (ESP) for hydrocarbon fluids, in chemistry, nuclear industries and in agriculture for irrigation purposes as well. Two-phase flows always deteriorate overall pump performances compared with single flow conditions. Several papers have been published aiming to understand flow physics and to model all the main mechanisms that govern gas pocket formation and surging phenomena. These mechanisms depend on the pump type, the impeller geometry, the rotational speed, design and off-design liquid flow rate conditions, the volumetric gas fraction, the fluid properties and the inlet pressure. In the present paper, a review on two phase performances from various centrifugal pumps designs is presented, mainly based on experimental results. The main focus is devoted to detect the significant geometrical parameters that: (1) Modify the pump head degradation level under bubbly flow regime assumption; (2) Allow single stage centrifugal pumps keep working under two-phase flow conditions with high inlet void fraction values before pump shut down, whatever the pump performance degradations and liquid production rates should be. Because most of the published experimental studies are performed on dedicated laboratory centrifugal pump models, most of the present review is based on air-water mixtures as the working fluid with inlet pressures close to atmospheric conditions. The following review supposes that gas phase is considered as a non-condensable perfect gas, while the liquid phase is incompressible. Both phases are isolated from external conditions: neither mass nor heat transfer take place between the phases.

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Study on Design of Air-water Two-phase Flow Centrifugal Pump Based on Similarity Law

Cited by 11 publications

References 5 publications

Experimental Investigations on the Inner Flow Behavior of Centrifugal Pumps under Inlet Air-Water Two-Phase Conditions

Experimental Investigations on the Inner Flow Behavior of Centrifugal Pumps under Inlet Air-Water Two-Phase Conditions

Validation of the steady and unsteady simulation based on an axial-flow pump

A Review of Design Considerations of Centrifugal Pump Capability for Handling Inlet Gas-Liquid Two-Phase Flows

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