Study on measures to improve gas-liquid phase mixing in a multiphase pump impeller under high gas void fraction

Zhang, J Y; Zhu, Hongwu; Ding, Kuang; Qiang, Rui

doi:10.1088/1755-1315/15/6/062023

Cited by 13 publications

(8 citation statements)

References 4 publications

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“…The Singhal model was employed and the effect of the non-condensable gas on the cavitation was considered [28]. The RNG k-ε turbulence model was adopted, which has been proven to characterize the flow in HAMP well [10,13]. The inlet and outlet boundaries were the pressure inlet and mass flow outlet, respectively.…”

Section: Numerical Schemementioning

confidence: 99%

“…The structure optimization of the HAMP is also one important aspect that researchers focused on. Zhang et al [10] proposed several measures, such as using short blades, blade surface openings, and T-shaped blades to improve the gas-liquid phase mixing in a multiphase pump impeller under high gas void fraction. The RNG k-ε turbulence model and Euler two-phase model were selected with an inlet bubble diameter of 0.6 mm.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Fluid Viscosity on Cavitation Characteristics of a Helico-Axial Multiphase Pump (HAMP)

Zhao

et al. 2022

Energies

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Fluid viscosity is one of the key factors affecting the cavitation characteristics of the Helico-axial Multiphase Pump (HAMP). In this paper, fluids with viscosities of 24.46 mm2/s, 48.48 mm2/s, 60.70 mm2/s, and 120.0 mm2/s were investigated by numerical simulation. The Ansys Fluent software was employed to conduct the simulation. The mixture multiphase flow model and the RNG k-ε turbulence model were adopted. The Singhal cavitation model was employed to consider the effects of the non-condensable gas on cavitation. An experiment was carried out to validate the numerical method. The results showed that the Net Positive Suction Head-available (NPSHA) of the pump decreased as the fluid viscosity increased. Under the critical NPSHA condition, the NPSHA decreased from 5.11 m to 3.68 m as the fluid viscosity increased from 24.46 mm2/s to 120.0 mm2/s. This suggested that the cavitation performance of the pump was deteriorated under high fluid viscosity. The impeller passage area occupied by the vapor increased when the fluid viscosity increased. Nearly half of the flow passages were occupied by cavitation bubbles when the fluid viscosity increased to 120.0 mm2/s. The vapor volume fraction, both on the suction surface and pressure surface of the blade, increased with the fluid viscosity. The vapor on the suction surface was mainly distributed in the region with the streamwise between 0 and 0.36 when the fluid viscosity was 24.46 mm2/s; while the high vapor volume fraction range increased to the streamwise of 0.42 when the fluid viscosity increased to 120.0 mm2/s. The higher vapor volume fraction corresponded with the lower pressure. It was also found that the turbulent kinetic energy, both on the suction surface and pressure surface, increased with the fluid viscosity, which was the favorite for producing more cavitation bubbles. Furthermore, the maximum velocity area was mainly concentrated in the inlet area of the impeller. The velocity distribution in the impeller was basically the same with the viscosity of 24.46 mm2/s and 48.48 mm2/s. When the viscosity further increased to 60.70 mm2/s, the maximum velocity area in the impeller was relatively large. This study provides a reference for designing the HAMP.

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Section: Numerical Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Fluid Viscosity on Cavitation Characteristics of a Helico-Axial Multiphase Pump (HAMP)

Zhao

et al. 2022

Energies

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“…Cao et al [18] combined the inverse method and direct flow analysis methods for the hydrodynamic design of a gas-liquid two-phase flow rotodynamic pump impeller; the impeller blade was back-loaded at the bub side to produce a favorable pressure distribution and the results demonstrated that the designed pump worked well and the design computation validity was proven. China Petroleum University has conducted hydraulic and structural designs, flow mechanism analysis, performance prediction and other work on helical-axial multiphase pumps and completed the performance test research on three generations of prototypes [19][20][21], providing important references for scholars in terms of blade selection, head estimation and performance prediction for this pump in the future.…”

Section: Type Of Pump Advantage Disadvantagementioning

confidence: 99%

Effect of Thickness Ratio Coefficient on the Mixture Transportation Characteristics of Helical–Axial Multiphase Pumps

Wan-jin

et al. 2020

Applied Sciences

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With the decrease of oil and gas resources on land, increased attention has been paid to multiphase oil–gas exploitation and the transportation technology represented by oil–gas multiphase pumps. The helical–axial multiphase pump has become the focus of research on oil and gas mixed transmission technology due to its relatively high operating efficiency and adaptability to a wide range of gas volume fraction changes. In order to investigate the thickness variation in the air foil from the hub to the shroud of the blade on the mixture transportation characteristics of the gas–liquid two-phase flow in a helical–axial pump, the thickness ratio coefficient ξ was introduced, and the hydraulic performance of the single compression unit with different thickness ratio coefficients was investigated. A single compression unit including an impeller, diffuser, inlet section and outlet section of a helical–axial multiphase pump. The hydraulic performance including the hydraulic head and efficiency was investigated by numerical simulation with the Eulerian multiphase model and the shear stress transport (SST) k-w turbulence model. In order to demonstrate the validity of the numerical simulation approach, the hydraulic head and efficiency of the basic model was measured based on a gas–liquid two-phase flow pump performance test bench. The simulation results agreed well with the experimental results; the error between the simulation results and experimental results of different inlet gas volume fractions was within 10% at the design point, which indicated the numerical simulation method can be used in the research. The thickness ratio coefficient ξ, which was taken as a variable, and the aggregation degree λ of the gas were introduced to analyze the gas–liquid mixture transportation characteristics of the pump. The thickness ratio coefficient was selected in a range from 0.8 to 1.8. The results showed that, for the same hub thickness, the head coefficient and efficiency increase, and the aggregation degree of gas decreases with the decreasing of the thickness ratio coefficient. The head coefficient of the modification multiphase pump was 5.8% higher in comparison to the base pump while the efficiency was 3.1% higher than that of the base pump, the aggregation degree of this model was the lowest, which was 30.3%; the optimal model in the research was the model of scheme 1 with ξ = 0.8. The accumulation of gas in the flow passage of the impeller could be delayed to the trailing edge of the blade by adjusting the thickness ratio coefficient, which produced a super-separated airfoil for helical–axial multiphase pumps and effectively ensured reliable operation under high gas volume fraction conditions. The accumulation area of gas was consistent with the area in which the gradient of turbulent kinetic energy was large.

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“…Others have investigated the performance of the multiphase pump under high GVF conditions. Zhang et al [24] proposed improvements to the performance of the multiphase pump under high GVF conditions. Yang et al [25] developed a comprehensive SRMP model to predict the performance of pumps at high GVF, which included steady-state behavior and transient performance during pump operation.…”

Section: Introductionmentioning

confidence: 99%

A Method for the Integrated Optimal Design of Multiphase Pump Based on the Sparse Grid Model

Peng

Zhang

Chen³

et al. 2022

Processes

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Multiphase pumps are used as an important tool for natural gas hydrate extraction owing to their excellent gas–liquid mixing and transport properties. This paper proposes an adaptive response surface-based integrated optimization design method. A model pump is designed based on the axial flow pump design theory. The model pump is numerically simulated and analyzed to obtain its performance parameters. Then the structural and performance parameters of the pump are parameterized to establish a closed-loop input–output system. Based on this closed-loop system, a sensitivity analysis is performed on the structural parameters of the impeller and guide vane, and the parameters that affect the performance of the gas–liquid hybrid pump the most are derived. The Sparse Grid method was introduced to design the experiment and construct the approximate model. The structural parameters of the impeller and guide vane are used as design variables to optimize the pressure increment and efficiency of the pump. After optimization, the pressure increment of the multiphase pump was increased by 10.78 KPa and the efficiency was increased by 0.89% compared to the original model. Finally, we validate the accuracy of the optimized model with tests.

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Study on measures to improve gas-liquid phase mixing in a multiphase pump impeller under high gas void fraction

Cited by 13 publications

References 4 publications

Influence of Fluid Viscosity on Cavitation Characteristics of a Helico-Axial Multiphase Pump (HAMP)

Influence of Fluid Viscosity on Cavitation Characteristics of a Helico-Axial Multiphase Pump (HAMP)

Effect of Thickness Ratio Coefficient on the Mixture Transportation Characteristics of Helical–Axial Multiphase Pumps

A Method for the Integrated Optimal Design of Multiphase Pump Based on the Sparse Grid Model

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