Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis

Zhang, Wenwu; Yu, Zeting; Zahid, Muhammad; Li, Yongjiang

doi:10.3390/en11051069

Cited by 43 publications

(22 citation statements)

References 28 publications

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“…And the CFD reliability has been confirmed by the comparisons with experimental tests (Ramezanizadeh et al, 2019;Yu et al, 2015Yu et al, , 2019. For instance, Zhang, Yu et al (2018) and Zhang et al (2019) used ICEM_CFD to analyze the distribution of the gas void fraction and pressure pulsation in a rotodynamic pump under different inlet gas volume fractions of 9%, 15%, and 21%. Suh et al (2018) proposed a numerical CFD method using Reynolds-averaged Navier-Stokes equations to investigate the hydraulic flow characteristics in a multiphase pump with different GVF i of 5%, 10%, and 15%, and analyzed the effects of various interphase forces acting between the gas and liquid phase and the bubble diameter.…”

Section: Introductionmentioning

confidence: 87%

Numerical study on void fraction wave of reciprocating multiphase pumps with high gas rates based on real gas models

Zhang

2020

Engineering Applications of Computational Fluid Mechanics

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Instantaneous gas-liquid flow and distribution have an important influence on the performance of a multiphase pump, especially under the high gas content conditions. How to accurately simulate the complete working cycle of a multiphase pump and reflect the transient oil-gas flow inside the pump cavity are the main difficulties of the study. A three-dimensional whole-cycle numerical simulation has been conducted to predict the void fraction waves of the reciprocating multiphase pumps under the high gas rates and to evaluate the effects of multi-case parameters on its pulsation characteristics. The instantaneous two-phase distribution and fluctuation characteristic accompanying the movement of the piston and the valves during each process of the multiphase pump are innovatively obtained under the high gas rates. Five different ideal gas model and real gas models used in this simulation are compared and optimized first, and then validated by the experimental results. Void fraction wave signals in the time and frequency domains are obtained from multiple working cycles of the multiphase pump, and the pulsation rates, propagation speeds, amplitudes, and power spectral densities are analyzed in great detail under different inlet gas contents, pressure ratios, crank speeds, and stroke lengths.

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Section: Introductionmentioning

confidence: 87%

Numerical study on void fraction wave of reciprocating multiphase pumps with high gas rates based on real gas models

Zhang

2020

Engineering Applications of Computational Fluid Mechanics

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“…Meanwhile, SST k-x turbulence model was applied for solving the turbulent viscosity. In this model, the k-e and k-x models are implemented for the boundary layer and the main flow regions, respectively, thus it can predict accurately for the flow separation in the pump [23]:…”

Section: Numerical Methodology 31 Governing Equationsmentioning

confidence: 99%

“…Although Yu et al [14] analyzed the variation trend of the interphase forces in a single impeller passage, the understanding of the gasliquid interphase behavior in multiphase rotodynamic pumps is still insufficient. Meanwhile, considering the complexity, safety and reusability of the testing system of multiphase pumps, the air-water combination has been usually used as the working medium [15]. Thus, few studies have been performed on the characteristics of phase interaction as well as the difference of transport properties caused by the change of medium viscosity in multiphase pumps.…”

Section: Introductionmentioning

confidence: 99%

Analysis of flow and phase interaction characteristics in a gas-liquid two-phase pump

Zhang

2018

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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To analyze the characteristics of internal flow and phase interaction in a gas-liquid two-phase pump, the influence of Inlet Gas Void Fraction (IGVF), discharge coefficient, and medium viscosity were investigated using medium combinations of air-water and air-crude. Simulations were performed using ANSYS_CFX at different IGVFs and various values of discharge coefficient. Structured grid for the full flow passage was generated using ICEM_CFD and TurboGrid. Under conditions of IGVF = 0% (pure water) and IGVF = 15%, the reliability of numerical method was proved by means of the comparison with the experimental data of external characteristic. The results for air-water combination showed a uniform gas distribution in the inlet pipe, and formation of a stratified structure in the outlet pipe. The gas in impeller gathered at the hub because of the rotation of the impeller, also, the interphase forces increased with the increased IGVF. For the two medium combinations, the drag force was the largest interphase force, followed by added mass and lift forces, and then the turbulent dispersion force was the least, which can be neglected. Because of the larger viscosity of crude than that of water, the variation trend of interphase forces in the impeller is relatively smooth along the flow direction when the medium combination was air-crude.

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“…where V is the velocity, p is the pressure, ρ is the density, ν is the kinematic viscosity, and τ ij are the Reynolds stresses, respectively. The Reynolds stresses τ ij were modeled with the extensively validated renormalization group (RNG) k-ε model, because it is economical and robust for predicting performance parameters like efficiency and cavitation with acceptable accuracy for turbomachinery [15,[26][27][28][29][30].…”

Section: Cfd Analysesmentioning

confidence: 99%

Comprehensive Hydraulic Improvement and Parametric Analysis of a Francis Turbine Runner

Zhu

Rao

et al. 2019

Energies

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Hydraulic turbines are usually required to operate in a wide range. The operation at off-design conditions not only reduces the unit efficiency, but also significantly deteriorates the dynamic stability of the turbines. In order to develop a turbine runner with good performances under multi operation conditions, a comprehensive hydraulic improvement has been done of a Francis turbine runner with a multipoint and multi-objective optimization design system. Compared with the initial runner, the runner generated from this method has a satisfactory improvement. In detail, unit efficiencies of the preferred runner are increased by 0.91%, 0.47% and 0.37%, respectively, under the rated head, a high head and the maximum head. The lowest pressure at blade surface is improved by 376.2 kPa under the rated head. CFD calculations are conducted to analyze the flow conditions inside of the preferred runner. In addition, runners with different main design inputs, namely blade lean, blade loading and blade meridional shape are furtherly investigated to reveal their relationship with runner’s internal flow and outer performances. In summary, this optimization system supplies satisfactory results and convincing recommendations to determine the design inputs for low-head Francis turbine runners.

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Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis

Cited by 43 publications

References 28 publications

Numerical study on void fraction wave of reciprocating multiphase pumps with high gas rates based on real gas models

Numerical study on void fraction wave of reciprocating multiphase pumps with high gas rates based on real gas models

Analysis of flow and phase interaction characteristics in a gas-liquid two-phase pump

Comprehensive Hydraulic Improvement and Parametric Analysis of a Francis Turbine Runner

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