Numerical Study on the First Stage Head Degradation in an Electrical Submersible Pump With Population Balance Model

Chen, Yiming; Patil, Abhay; Chen, Yi; Bai, Changrui; Wang, Yintao; Morrison, Gerald L.

doi:10.1115/1.4041408

Cited by 23 publications

(14 citation statements)

References 17 publications

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“…The bubble sizes of the 10 groups are shown in Table 2. At the pump inlet, the bubble size fraction of the groups with medium-diameter bubbles [21] d 4 and d 5 are set to 0.5, respectively, and the other bubble size groups are set to 0. In the numerical calculation, the bubble size fraction in the flow field reaches a balanced state through the bubble breakup and coalescence.…”

Section: Discrete Particle Population Balance Model (Pbm)mentioning

confidence: 99%

“…Therefore, the results obtained by using this model to simulate the gas-liquid two-phase flow field are more accurate. There are few cases [21] in which the PBM model is applied to a gas-liquid two-phase numerical simulation of rotating machinery, and the prediction accuracy for the gas-liquid two-phase rotating machinery performance is not clear.In the present work, the population balance model was applied to a gas-liquid two-phase flow three-stage centrifugal pump with rotating components by using ANSYS CFX 18.0. The numerical simulation results were compared with the experimental results to verify the accuracy of the numerical simulation.…”

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confidence: 99%

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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: Discrete Particle Population Balance Model (Pbm)mentioning

confidence: 99%

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confidence: 99%

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

et al. 2020

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“…Caridad et al [8] used a dual-fluid model to analyze the two-phase flow in the impeller, but neglected the influence of the interaction between the rotor and the stator. Yiming et al [9] simulated and visualized the flow field of an electric submersible pump based on Population Balance Model (PBM), studied the effect of gas volume fraction on pump head, and found that gas accumulation and phase separation occurred on the suction surface of the impeller blade. Caridad et al [10] used ANSYS CFX software to carry out the numerical calculation of the ESP and found that the bubble diameter has a great influence on the simulation results, and the accumulation of air on the blade surface leads to the decline of the pump performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Diversion Cavity Geometry on the Performance of Gas-Liquid Two-Phase Mixed Transport Pump

Luo

Feng

et al. 2020

Energies

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For the purpose of improving the transport capability of the mixed transport pump, a new self-made three-stage deep-sea multiphase pump was taken as the research object. Based on the Euler-Euler heterogeneous flow model, liquid (water) and gas (air) are used as the mixed media to study the external characteristics and internal flow identities of the mixed pump under different gas volume fraction (GVF) conditions. According to the simulation results, a local optimal design scheme of the diversion cavity in the dynamic and static connection section is proposed. The numerical results before and after the optimization are compared and analyzed to explore the effect of the diversion cavity optimization on the performance, blade load and internal flow identities of the pump. The results show that the head and efficiency are obviously improved when the inner wall of the diversion cavity is reduced by 4 mm along the radial direction. After optimization, under the condition of 10% gas content, the head and efficiency is increased by 3.73% and 2.91% respectively. Meanwhile, the hydraulic losses of the diversion cavity and diffuser are reduced by 9.11% and 4.32% respectively. The gas distribution in the impeller is improved obviously and the phenomenon of a large amount of gas phase accumulation is eliminated in the channel. In addition, the abnormal pressure load on the blade surface is eliminated and the turbulent flow energy intensity is reduced. The average turbulent kinetic energy ( T K ) at i = 0.51 of the first stage impeller passage is reduced by 35%. Finally, the reliability of the numerical method is verified by the experimental results. To sum up, the performance and internal flow identities of the optimized mixed transport pump are improved, which verifies the availability and applicability of the optimization results. This provides a reference for the research and design of a multiphase mixed transport pump in the future.

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“…Based on the concept that submersible pumps belong to the category of centrifugal pumps, research mostly focuses on the calculations pertaining to and characteristic analysis of the internal flow field surrounding the centrifugal pump impeller and volute [10][11][12][13][14][15][16][17][18]. For submersible pumps with diffusers, pertinent studies on electrical submersible pumps (ESPs), in which the impeller and diffuser compose a single stage, have been reported in the literature [19][20][21]; these studies include those pertaining to independent structural parameters that affect the pump performance and structural optimization [22][23][24]. The performance of a pump is the result of all parameters acting simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the impact of the coupling of diffuser parameters on the performance of submersible pumps used in town water distribution systems

Wei

Sun

Shamseldin

2019

J Braz. Soc. Mech. Sci. Eng.

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Diffusers are energy conversion devices in submersible pump structures, and they play a key role in improving the pump performance and operational stability. However, investigations pertaining to the factors influencing the performance of diffusers, in particular the effect of the coupling of factors on the performance of submersible pumps, are still rare. This study focuses on the effect of coupled parameters, such as the inlet angle, inlet width, axial length and number of blades of diffusers, for improving the performance of submersible pumps. First, the orthogonal test method is used to design the diffuser scheme, and sixteen models involving the coupling of different diffuser parameters are established and simulated. Next, the path analysis method is used to extensively understand the effect mode and influence degree of diffuser parameter coupling on the performance of submersible pumps. The results indicate that the mode of action of the diffuser parameters on the performance of the submersible pump can divided into two aspects: the direct action of the parameter itself and the indirect effect of the parameter coupling induced by other parameters. The orders of significance of the parameters affecting the head and efficiency are α 3n > L > b 3 > z and L > α 3n > b 3 > z, respectively. The contribution rates of the inlet angle, inlet width, axial length and number of blades to the pump efficiency are 31.56%, 16.53%, 37.05% and 14.86%, respectively. The numerical results show that the combination of the diffuser parameters-blade inlet angle of 30°, inlet width of 45 mm, axial length of 100 mm and number of blades equal to 8-can help realize the maximum efficiency (83.5%) of a submersible pump with a 18.9 m head. In the production design, the parameters can be quantitatively evaluated in advance by using path analysis. On this basis, the key parameters can be selected according to the order of magnitude of the influence degree. Furthermore, taking into account the production process and manufacturing costs, it is necessary to consider the active role of the non-key parameters in improving the submersible pump performance.

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Numerical Study on the First Stage Head Degradation in an Electrical Submersible Pump With Population Balance Model

Cited by 23 publications

References 17 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

Effect of Diversion Cavity Geometry on the Performance of Gas-Liquid Two-Phase Mixed Transport Pump

Numerical study on the impact of the coupling of diffuser parameters on the performance of submersible pumps used in town water distribution systems

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