Study of Air-Water Two-Phase Centrifugal Pump by Means of Electric Resistivity Probe Technique for Void Fraction Measurement : 1st Report, Measurement of Void Fraction Distribution in a Radial Flow Impeller

Sekoguchi, Kotohiko; Takada, Sadakazu; Kanemori, Yuji

doi:10.1299/jsme1958.27.931

Cited by 21 publications

(10 citation statements)

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“…More recently, Kosyna et al [7] measure impeller blade unsteady static pressure on the rotating impeller blade pressure and suction sides. Local flow visualizations, bubble trajectories and sizes evaluation have been performed, for example by Secoguchiet et al [8], Izturiz [9], and Barrios [10]. An evaluation of local void fraction in two phase flows recently obtained by Neumann et al [11], using X-Ray tomography technique, also detected a thin gas film on the pressure side for the first time.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Flow Characteristics of Centrifugal Pump under Air-water Inflow

Si¹,

He²,

Bois³

et al. 2019

IJFMS

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A two-phase liquid pumping test ring is built to study the flow induced characteristics of centrifugal pump under the air-water flow working condition. Pump performances are measured under different flow rates and different inlet air void fraction (a). Pressure pulsation signal spectrums and their probability density maps are also recorded. The calculations, using URANS k-epsilon turbulence model combined with the Euler-Euler inhomogeneous two-phase model, are also performed to obtain inner flow structure inside the impeller and volute channels under different air-water conditions in order to understand the pump characteristic evolutions. The results show that the performance of centrifugal pump is more sensitive to air inlet injection at low flow rates. The maximum air void fraction of model pump could reach 10% when the pump operates at the highest efficiency point, and the performance drops sharply when the air void fraction is more than 8%. The dominant frequency of pump outlet pressure pulsation is still at the blade passing frequency even under two-phase condition. Frequency amplitude increases with the increase of a. The greater the a, the more low frequency appears in broadband characteristics. With the increase of a, the probability density amplitude of pressure pulsation decreases gradually, and its span becomes gradually wider as well. Comparisons between numerical local results, experimental unsteady pressure can explain part of the phenomena that are found in the present paper.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Flow Characteristics of Centrifugal Pump under Air-water Inflow

Si¹,

He²,

Bois³

et al. 2019

IJFMS

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show abstract

“…6%-7%) and so, far from surge operating conditions that correspond to a rapid performance decrease of the pump, the rate of which depend on the initial water flow rate. Just before such severe conditions, several investigations have detected the presence of stationary bubbles at impeller entrance channels for high gas fractions, being responsible for performance degradation of the pump (Murakami and Minemura [1974 b];Patel and Rundstadler[1978]; Sekoguchi [1984]. Estevam[2003] and Barrios and Prado [2009].…”

Section: Introductionmentioning

confidence: 99%

Investigation on centrifugal pump performance degradation under air-water inlet two-phase flow conditions

Cui

Zhang

et al. 2018

La Houille Blanche

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In order to study the flow characteristics of centrifugal pumps when transporting the gas-liquid mixture, water and air were chosen as the working medium. Both numerical simulation and experimental tests were conducted on a centrifugal pump under different conditions of inlet air volume fraction (IAVF). The calculation used URANS k-epsilon turbulence model combined with the Euler-Euler inhomogeneous two-phase model. The air distribution and velocity streamline inside the impeller were obtained to discuss the flow characteristics of the pump. The results show that air concentration is high at the inlet pressure side of the blade, where the vortex will exist, indicating that the gas concentration have a great relationship with the vortex aggregation in the impeller passages. In the experimental works, pump performances were measured at different IAVF and compared with numerical results. Contributions to the centrifugal pump performance degradations were analyzed under different air-water inlet flow condition such as IAVF, bubble size, inlet pressure. Results show that pump performance degradation is more pronounced for low flow rates compared to high flow rates. Finally, pressure pulsation and vibration experiments of the pump model under different IAVF were also conducted. Inlet and outlet transient pressure signals under four IAVF were investigated and pressure pulsation frequency of the monitors is near the blade passing frequency at different IAVF, and when IAVF increased, the lower frequency signal is more and more obvious. Vibration signals at five measuring points were also obtained under different IAVF for various flow rates.

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“…Most of these studies used transparent casing to visually observe the pump internal flow patterns. Starting with the original volute-type centrifugal pumps [31,32,[56][57][58][59][60][61][62][63][64][65][66][67][68][69][70], they cover several research topics including flow pattern recognition, bubble movement visualization, mapping transition boundaries etc. Murakami and Minemura [31,32] experimental study first investigated the gas entrainment effect on the hydraulic pump head of a centrifugal pump visually, and associated the degradation of pump performance with gas-liquid flow pattern inside the rotor.…”

Section: Flow Pattern Recognitionmentioning

confidence: 99%

A Review of Experiments and Modeling of Gas-Liquid Flow in Electrical Submersible Pumps

Zhu

Zhang

2018

Energies

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As the second most widely used artificial lift method in petroleum production (and first in produced amount), electrical submersible pump (ESP) maintains or increases flow rate by converting kinetic energy to hydraulic pressure of hydrocarbon fluids. To facilitate its optimal working conditions, an ESP has to be operated within a narrow application window. Issues like gas involvement, changing production rate and high oil viscosity, greatly impede ESP boosting pressure. Previous experimental studies showed that the presence of gas would cause ESP hydraulic head degradation. The flow behaviors inside ESPs under gassy conditions, such as pressure surging and gas pockets, further deteriorate ESP pressure boosting ability. Therefore, it is important to know what parameters govern the gas-liquid flow structure inside a rotating ESP and how it can be modeled. This paper presents a comprehensive review on the key factors that affect ESP performance under gassy flow conditions. Furthermore, the empirical and mechanistic models for predicting ESP pressure increment are discussed. The computational fluid dynamics (CFD)-based modeling approach for studying the multiphase flow in a rotating ESP is explained as well. The closure relationships that are critical to both mechanistic and numerical models are reviewed, which are helpful for further development of more accurate models for predicting ESP gas-liquid flow behaviors.

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Study of Air-Water Two-Phase Centrifugal Pump by Means of Electric Resistivity Probe Technique for Void Fraction Measurement : 1st Report, Measurement of Void Fraction Distribution in a Radial Flow Impeller

Cited by 21 publications

References 0 publications

Experimental and Numerical Studies on Flow Characteristics of Centrifugal Pump under Air-water Inflow

Experimental and Numerical Studies on Flow Characteristics of Centrifugal Pump under Air-water Inflow

Investigation on centrifugal pump performance degradation under air-water inlet two-phase flow conditions

A Review of Experiments and Modeling of Gas-Liquid Flow in Electrical Submersible Pumps

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