Experimental Investigation on Transient Pressure Characteristics in a Helico-Axial Multiphase Pump

Xu, Ye; Cao, Shuai; Sano, Takeshi; Wakai, Tokiya; Reclari, Martino

doi:10.3390/en12030461

Cited by 46 publications

(17 citation statements)

References 35 publications

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“…Experimental flow loop of a gas-liquid two-phase three-stage pump: 1 air compressor, 2 gas buffer tank, 3 gas mass flowmeter, 4 plunger pump, 5 liquid mass flowmeter, 6 gas-liquid mixing section, 7 gas-liquid mixer, 8 experimental pump, 9 torque tachometer, 10 electric motor, 11 pneumatic control valve, 12 gas-liquid separator, 13 micropore muffler, 14 water tank, 15 backflow valve.…”

Section: Figurementioning

confidence: 99%

Numerical Investigation on Bubble Distribution of a Multistage Centrifugal Pump Based on a Population Balance Model

et al. 2020

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This work aimed to study the bubble distribution in a multiphase pump. A Euler-Euler inhomogeneous two-phase flow model coupled with a discrete particle population balance model (PBM) was used to simulate the whole flow channel of a three-stage gas-liquid two-phase centrifugal pump. Comparison of the computational fluid dynamic (CFD) simulation results with experimental data shows that the model can accurately predict the performance of the pump under various operating conditions. In addition, the liquid phase velocity distribution, gas-phase distribution, and pressure distribution of the second stage impeller at a 0.5 span of blade height under three typical working conditions were compared. Results show that the region with high local gas volume fraction (LGVF) mainly appears on the suction surface (SS) of the blade. With the increase in inlet gas volume fraction (IGVF), vortices and low velocity recirculation regions are generated at the impeller outlet and SS of the blade, the area with high LGVF increases, and gas–liquid separation occurs at the SS of the blade. The liquid phase flows out of the impeller at high velocity along the pressure surface of the blade, and the limited pressurization of fluid mainly happens at the impeller outlet. The average bubble size at the impeller outlet is the smallest while that at the impeller inlet is the largest. Under low IGVF conditions, bubbles tend to break into smaller ones, and the broken bubbles mainly concentrate at the blade pressure surface (PS) and the impeller outlet. Bubbles tend to coalesce into larger ones under high IGVF conditions. With the increase in IGVF, the bubble aggregation zone diffuses from the blade SS to the PS.

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Section: Figurementioning

confidence: 99%

Numerical Investigation on Bubble Distribution of a Multistage Centrifugal Pump Based on a Population Balance Model

et al. 2020

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“…A multiphase helico‐axial pump with an innovative structure and employing the splitter blades was provided by Xu et al 14 They observed that flow control is significant and challenging in the multiphase pump and requires more blades. The splitter blades aid the performance of the helico‐axial pump more than any other rotor‐dynamic pump as it helps in improving the control during the downstream flow, whereas eliminating the increase in exclusion coefficient at the impeller inlet.…”

Section: Types Of Multiphase Pumpsmentioning

confidence: 99%

Recent progress in multiphase flow simulation through multiphase pumps

et al. 2020

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The multiphase flow pumps cover a wide range of industrial sectors extending across petrochemical, metallurgy, and dredging, chemical industry, paint, and construction. The major application is the handling of wet gas and vapor that will condense partially during the compression stage. The main progress in the area of multiphase pumps has been the innovation of a computational fluid dynamics (CFD) numerical approach to simulate three‐dimensional flows inside the pump and to predict pump performance. CFD undoubtedly constitutes one of the most promising approaches for the design, analysis, and performance assessment of complex machines. However, practical application of the CFD tool to determine the internal flow field in multiphase pumps is still far from reality owing to the limitations of a detailed three‐dimensional model of the pump and accuracy of multiphase flow simulation. This review accentuates the influence of different geometrical and dynamical parameters on the performance of the pump and the use of CFD simulation to predict the detailed flow patterns of fluid mixtures. CFD analysis has unearthed the fact that the pattern of inner flow varies with the flow rate and concentration of each phase and the rotation speed of the impeller and number of blades were also found to considerably impact pump performance.

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“…[24] built an experiment facility that would allow visualization inside the impeller to study the gas-liquid flow patterns inside a centrifugal pump impeller, the effects of the gas-liquid flow pattern, bubble changes, and the flow in the impeller on the performance of the centrifugal pump were researched under different operating conditions. In addition, some related research was carried out on the multiphase pump with experimental methods, to obtain some valuable conclusions [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Effect of Flow Rate on Turbulence Dissipation Rate Distribution in a Multiphase Pump

et al. 2021

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The turbulence dissipation will cause the increment of energy loss in the multiphase pump and deteriorate the pump performance. In order to research the turbulence dissipation rate distribution characteristics in the pressurized unit of the multiphase pump, the spiral axial flow type multiphase pump is researched numerically in the present study. This research is focused on the turbulence dissipation rate distribution characteristics in the directions of inlet to outlet, hub to rim, and in the circumferential direction of the rotating impeller blades. Numerical simulation based on the RANS (Reynolds averaged Navier–Stokes equations) and the k-ω SST (Shear Stress Transport) turbulence model has been carried out. The numerical method is verified by comparing the numerical results with the experimental data. Results show that the regions of the large turbulence dissipation rate are mainly at the inlet and outlet of the rotating impeller and static impeller, while it is almost zero from the inlet to the middle of outlet in the suction surface and pressure surface of the first-stage rotating impeller blades. The turbulence dissipation rate is increased gradually from the hub to the rim of the inlet section of the first-stage rotating impeller, while it is decreased firstly and then increased on the middle and outlet sections. The turbulence dissipation rate distributes unevenly in the circumferential direction on the outlet section. The maximum value of the turbulence dissipation rate occurs at 0.9 times of the rated flow rate, while the minimum value at 1.5 times of the rated flow rate. Four turning points in the turbulence dissipation rate distribution that are the same as the number of impeller blades occur at 0.5 times the blade height at 0.9 times the rated flow rate condition. The turbulence dissipation rate distribution characteristics in the pressurized unit of the multiphase pump have been studied carefully in this paper, and the research results have an important significance for improving the performance of the multiphase pump theoretically.

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Experimental Investigation on Transient Pressure Characteristics in a Helico-Axial Multiphase Pump

Cited by 46 publications

References 35 publications

Numerical Investigation on Bubble Distribution of a Multistage Centrifugal Pump Based on a Population Balance Model

Numerical Investigation on Bubble Distribution of a Multistage Centrifugal Pump Based on a Population Balance Model

Recent progress in multiphase flow simulation through multiphase pumps

Effect of Flow Rate on Turbulence Dissipation Rate Distribution in a Multiphase Pump

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