Sand management and erosion prediction in subsea multiphase pumps

Ekeberg, Ina; Bibet, Pierre-Jean; Knudsen, Halfdan; Reimers, Øyvind; Torbergsen, Erik

doi:10.33737/jgpps/145322

Cited by 4 publications

(6 citation statements)

References 3 publications

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“…The specific derivation process and detailed explanations for this transformation can be found in the relevant literature on fluid dynamics or continuum mechanics. [34][35][36][37][38] The expression of the rigid vorticity ω R proposed by Liu et al 36 and Wang et al 38 is given by Equation (3).…”

Section: Vorticity Decomposition Theorymentioning

confidence: 99%

“…2 Multiphase oil and gas transfer technology not only reduces maintenance costs but also significantly improves transfer efficiency. 3 However, a gap called the tip clearance inevitably forms between the impeller top and the inner wall of the oil-gas multiphase pump, and the tip leakage vortex (TLV) evolves from leakage flow, which is driven by the pressure difference on both sides of the blade. Besides, the TLV will aggravate the unsteady flow of the multiphase pump, in addition to producing cavitation, vibration, and noise hazards.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic characteristics of the tip leakage vortex in an oil–gas multiphase pump based on vorticity decomposition theory

Shi,

Sun,

Wang

et al. 2024

Energy Science & Engineering

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The paper combines experimental and numerical simulation methods to investigate the tip leakage vortex (TLV) in an oil–gas multiphase pump. The study aims to understand the evolution and dynamic characteristics of the TLV. The vorticity decomposition theory is used to analyze the spatial–temporal evolution, transient behavior, and rigid vorticity of the TLV. The findings reveal that the TLV is formed near the pressure surface when the tip clearance jet passes through the shear layer. In one impeller rotation period, transient fluctuations of the TLV are attributed to pressure differences and velocity changes across the tip clearance, and the TLV undergoes two split–dissipation–recurrence processes within one impeller rotation cycle. The presence of the gas phase enhances the scale and strength of the TLV while prolonging its existence in the flow channel. Analysis based on the rigid vorticity transport equation shows that the growth of the TLV and collapse are primarily governed by the rigid vortex generation term. The Coriolis force term contributes to stabilizing the TLV, while the rigid vorticity stretching term affects its shape. Furthermore, the gas phase significantly increases the value of the Rigid vorticity Curl of pseudo‐Lamb vector Term (RCT), which plays a crucial role in the prolonged existence of the TLV under gas–liquid two‐phase conditions. From an inlet gas void fraction of 0%–20%, the RCT value increases by 4.8 × 106/s2, the entropy production value increases by 75.55%, and the hydraulic efficiency decreases by 16.29%.

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Section: Vorticity Decomposition Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of the tip leakage vortex in an oil–gas multiphase pump based on vorticity decomposition theory

Shi,

Sun,

Wang

et al. 2024

Energy Science & Engineering

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“…Bibet et al 25 tested the balance drum gap of a helical propeller pump, it was found that dividing the gap surface into three individual sections, and adding swirling separation at each inlet sections can effectively reduce the rotor synchronous vibration. Ekeberg et al 26 investigated the effects of rotational velocity and inlet gas ratio of a multiphase pump on balance drum gap flow rate and vibration by experiments, it was found that the balance drum stiffness is the main cause of rotor instability with one or more natural frequencies.…”

Section: Introductionmentioning

confidence: 99%

Study on the balance force regulation method of multi-stage pump balance drum system

Chen

Lihuan

Zhipeng³

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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Balanced drum systems are widely used in high-pressure multi-stage pump axial force balancing mechanisms. When the pump working, the fluid (solid-fluid mixture) collides with each other or rubs against the pump case, and the balance drum is affected by this situation for a long time, so wear of the balance drum gap occurs from time to time. The first is to study how the axial force of the multistage pump changes at different balance drum gap sizes in this paper. Based on the energy equation and momentum equation, and on the basis of maintaining the original balance force unchanged, a new equation of resistance pressure difference relationship is established. The corresponding relationship between balance drum gap and balance pipe orifice plate is obtained by solving this equation. The result shows that the larger the balance drum gap, the greater the balance drum balance force decreases obviously, and the multistage pump residual axial force increases in multiples. The adjustment formula of balance force can be used to obtain the radial size of the balance pipe orifice plate under different balance drum gap, when the gap increases, to keep the balance force constant, the diameter of the orifice plate should be increased gradually. After adjusting the balance force, the fluid velocity uniformity and velocity average angle of balance pipe increases, the flow pattern in the pipe becomes uniform, the gap leakage increases and the pump efficiency decreases. The pump hydraulic properties and balancing the axial force have an opposing relationship, that is, by promoting the drum balance force, the pump hydraulic properties will be reduced. Due to processing balance drum is complex, frequent replacement is time-consuming and costly, so this article provides a handy approach for enhancing the balance force of balance drum, the results of the study can provide guarantees for the balance drum system optimization and long period stable operation of the multistage pump.

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“…The smooth clearance of balance drum of a spiral axial-flow pump was tested by Bibet et al 30 It was found that the synchronous vibration of the rotor can be effectively reduced by dividing the smooth surface of the balance drum clearance into three separate clearances and adding a cyclone partition at the inlet of each segment. Ekeberg et al 31 studied the influence of the rotating speed and the inlet gas percentage of the multiphase pump on the flow rate change of the balance drum clearance and rotor vibration through the experimental method. Researchers in related fields at home and abroad have carried out a lot of basic work on the influence and optimization of the balance drum clearance flow on the balance force and other local characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Ekeberg et al. 31 studied the influence of the rotating speed and the inlet gas percentage of the multiphase pump on the flow rate change of the balance drum clearance and rotor vibration through the experimental method. Researchers in related fields at home and abroad have carried out a lot of basic work on the influence and optimization of the balance drum clearance flow on the balance force and other local characteristics.…”

Section: Introductionmentioning

confidence: 99%

Calculation and verification of balance force of multistage pump balance drum

Chen

Luo

Yang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The axial force balancing capacity of a balance drum is a key factor affecting the life of multi-stage centrifugal pumps. At present, the traditional calculation formula of the balance force of a balance drum is mainly obtained by modifying the relationship between the last-stage impeller head and the total head through empirical coefficient, and the calculation result is less sensitive to the change of the balance drum clearance. However, many studies have shown that the increase of clearance is the main factor affecting the balance force of a balance drum. In addition, the cost of measuring the balance force of a balance drum is relatively high. Therefore, it is particularly necessary to derive the mathematical expression and to propose a simple method for measuring the balance force of a balance drum. According to the resistance equation of clearance fluid and the N-S equation under cylindrical coordinate system, the variation laws of the pressure difference along axial and radial directions in the two sides of the balance drum clearance were derived. And the mathematical formula of the balance force of a balance drum, the balance drum clearance leakage and the balance tube flow was established. The new derived formula calculation results were compared with the traditional formula calculation results and the numerical calculation results. The results show that: at nominal flow rate, the mean value of the pressure difference of a balance drum increases in a parabolic shape along the radial direction. When the clearance increases from 0.1 to 0.35 mm, the relative error of the balance force between the traditional formula calculation and the numerical calculation is 71.1%, 58.5%, 19.6%, 8.1%, −18.6% and −32.31%, while that between the new formula calculation and the numerical calculation is 3.08%, 6.21%, 4.82%, 1.17%, 3.42% and 6.58%, indicating that the new derived formula can accurately calculate the balance force of a balance drum. In addition, according to the new derived formula, the balance force of a balance drum can be measured directly by the flow rate of the balance tube, which provides a theoretical support for dynamic monitoring of the balance force of a balance drum in engineering.

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Sand management and erosion prediction in subsea multiphase pumps

Cited by 4 publications

References 3 publications

Dynamic characteristics of the tip leakage vortex in an oil–gas multiphase pump based on vorticity decomposition theory

Dynamic characteristics of the tip leakage vortex in an oil–gas multiphase pump based on vorticity decomposition theory

Study on the balance force regulation method of multi-stage pump balance drum system

Calculation and verification of balance force of multistage pump balance drum

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