Multiphase Flow Analysis for Air-Water Bubbly Flow in a Multiphase Pump

2017 ◽  
Author(s):  
Jun-Won Suh ◽  
Young-Seok Choi ◽  
Jin-Hyuk Kim ◽  
Kyoung-Yong Lee ◽  
Won-Gu Joo
Keyword(s):  
Flow Field ◽  
Multiphase Flow ◽  
Gas Phase ◽  
Volume Fraction ◽  
High Reliability ◽  
Bubbly Flow ◽  
Flow Analysis ◽  
Internal Flow ◽  
Hydraulic Performance ◽  
Multiphase Pump

Owing to the exhaustion of onshore resources, the development of resources has been expanded to the deep subsea. As the necessity of offshore plants is steadily increasing, there is an increasing interest in studying multiphase transportation technology. Multiphase pumps differ from single phase pumps in many ways, including performance evaluation, internal flow characteristics, and complex design methods. The primary issue of multiphase flow transport technology is that the characteristics of the internal flow change according to the gas volume fraction (GVF). Many theoretical and experimental analyses have been conducted to understand the mechanism of the internal flow field in multiphase pumps. As advanced computational fluid dynamics (CFD) based on the three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations have become reliable tools, numerical analyses accompanied by experimental research have been applied to investigate the hydraulic performance and internal flow field of multiphase pumps. A number of studies have been conducted to investigate these phenomena. However, the understanding of the detailed mechanisms of phase separation and the forces that occur in the internal flow is not completely clear. This study aimed to establish a multiphase flow analysis method with high reliability when the internal flow of the multiphase pump is bubbly flow. To ensure the reliability of the numerical analysis, the numerical results were compared with the experimental data. Additionally, to analyze the detailed dynamic flow phenomena in the multiphase pump, the effects of various interphase forces acting between the liquid and gas phase and the particle diameter of the gas phase on the hydraulic performance were investigated.

The Influence of Wrap Angle of Blade on the Internal Flow Field and Hydraulic Performance of Double Suction Pump

2018 ◽  
Author(s):  
Hao Chang ◽  
Weidong Shi ◽  
Wei Li ◽  
Jianrui Liu ◽  
Ling Zhou ◽  
...  
Keyword(s):  
Flow Field ◽  
Cross Section ◽  
Turbulence Model ◽  
Static Pressure ◽  
Internal Flow ◽  
Hydraulic Performance ◽  
Optimal Model ◽  
Suction Pump ◽  
External Characteristic ◽  
Wrap Angle

In order to study the influence rule of wrap angle of blade on the internal flow field and hydraulic performance of double suction pump, 5 kinds of wrap angles of blade with 100°, 110°, 120°, 130° and 140° are designed in this paper. The turbulence model and the grid type are analyzed, the performance of ES350-575 double suction pump is obtained by employ the software CFX. The static pressure and velocity distributions in the cross-section are analyzed. Therefore, the optimal model is obtained, and the relevant external characteristic test is conducted. The result shows that the reasonable increase of the wrap angle of blade can enhance the performance of the pump effectively, which can improve the static pressure and velocity distributions of the internal flow field.

Multi Objective Optimization of a Multiphase Pump for Offshore Plants

2014 ◽  
Author(s):  
Joon-Hyung Kim ◽  
Him-Chan Lee ◽  
Joon-Yong Yoon ◽  
Kyoung-Yong Lee ◽  
Yong-Kab Lee ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Crude Oil ◽  
Single Phase ◽  
Volume Fraction ◽  
Optimization Technique ◽  
Internal Flow ◽  
Multi Objective Optimization ◽  
Pump System ◽  
Multiphase Pump ◽  
Multi Objective

The crude oil produced from well contains a mixture of oil, gas and water. The existing pump system that uses a single phase pump requires a separator to separate the crude oil. Changing from a single phase pump to a multiphase pump significantly reduces costs because a multiphase pump does not require a separator. Therefore, most wells currently being developed apply the multiphase pump system. In this study, a multiphase pump was designed using a multi objective optimization technique. To conduct research, a base model was chosen and its performance was evaluated through numerical analysis. The design variables and variable ranges were set for the impeller and the diffuser. Based on the selected variables, experiment sets were produced. The experiment sets were also evaluated for their performance using numerical analysis. Based on the performance evaluation results of each experiment set, the optimization model for a multiphase pump was derived using Response Surface Method (RSM). In addition, each model’s performance for multiphase flow was also evaluated according to changes in Gas Volume Fraction (GVF) using multiphase numerical analysis. Furthermore, the internal flow characteristics of each model were analyzed.

scholarly journals Research on cooperative optimization of multiphase pump impeller and diffuser based on adaptive refined response surface method

2022 ◽  
Vol 14 (1) ◽  
pp. 168781402110729
Author(s):  
Peng Cancan ◽  
Zhang Xiaodong ◽  
Gao Zhiguang ◽  
Wu Ju ◽  
Gong Yan
Keyword(s):  
Response Surface ◽  
Design Theory ◽  
Volume Fraction ◽  
Axial Flow ◽  
Hydraulic Performance ◽  
Surface Model ◽  
Pump Impeller ◽  
Multiphase Pump ◽  
Multi Objective ◽  
Optimized Model

Multiphase pumps play an important role in the exploitation of natural gas hydrate. Compared with ordinary pumps, they can handle fluids with higher gas volume fraction (GVF). Therefore, it is important to improve the performance of the pump under high GVF. A model pump is designed based on the design theory of axial flow pump and centrifugal pump inducer. The hydraulic performance of the model pump is verified by numerical simulation and experiment. The Sparse Grid method is applied to the design of experiment (DOE), and three different adaptive refined response surface methods (RSM) are applied to the build the approximate model. Refinement points and verification points are used to improve and verify the precision of the response surface, respectively. The model with high precision and high computational efficiency is obtained through comparison and analysis. The multi-objective optimization of the optimal response surface model is carried out by MOGA (Multi-Objective Genetic Algorithm) method. The pressure increment of the optimized model is increased by 38 kPa. The efficiency is significantly improved under large mass flow conditions. The hydraulic performance of the optimized model is compared with that of the basic model. And the reasons that affect the performance of the multiphase pump are analyzed.

Influence of Guide Vane Wrap Angle Key Design Parameters on Hydraulic Performance of Nuclear Reactor Coolant Pump

2014 ◽  
Vol 721 ◽  
pp. 73-77 ◽  
Author(s):  
Wei Nan Jin ◽  
Rong Xie ◽  
Mu Ting Hao ◽  
Xiao Fang Wang
Keyword(s):  
Flow Field ◽  
Nuclear Reactor ◽  
Guide Vane ◽  
Three Dimensional ◽  
Internal Flow ◽  
Hydraulic Performance ◽  
Design Parameters ◽  
Coolant Pump ◽  
Reactor Coolant ◽  
Wrap Angle

To study the effects of guide vane with different vane wrap angles and relative positions of outlet edge on hydraulic performance of nuclear reactor coolant pump, three-dimensional steady numerical simulations were performed by using CFD commercial software Numeca. The results show that the vane wrap angle changes the head and power characteristics by changing the relative velocity angle in vane outlet. The inner flow field changes while the wrap angle changes. With the wrap angle increases, the shock loss in volute is reducing, but the friction loss in vane passages is getting large. So there exists an optimum wrap angle and relative positions of outlet edge that corresponds to the highest efficiency of a pump. Numerical simulation is performed with the two key design parameters optimized through surrogate model, the internal flow field is improved and then the hydraulic efficiency is improved.

Flow Analysis of Melted Urea in a Perforated Rotating Bucket

2013 ◽  
Vol 372 ◽  
pp. 340-345 ◽  
Author(s):  
Aadil Muhammad ◽  
Nejat Rahmanian ◽  
Rajashekhar Pendyala
Keyword(s):  
Fluid Dynamics ◽  
Mass Transfer ◽  
Flow Field ◽  
Flow Analysis ◽  
Internal Flow ◽  
Geometrical Model ◽  
Transfer Performance ◽  
Computational Fluid Dynamics Cfd ◽  
Rotating Bucket ◽  
Comprehensive Study

A comprehensive study of the internal flow field for the prilling application in a perforated rotating bucket has been carried out. Computational Fluid Dynamics (CFD) is used to investigate the flow field of urea melt inside the perforated rotating bucket. The bucket is mounted at the top of the prilling tower. In prilling process, urea melt is sprayed by the perforated rotating bucket to produce the urea droplets, which falls down due to gravity. These drops fall down through a cooling medium and solidify into prills. The velocity field in the bucket is very important to study, as it has great effect on the heat and mass transfer performance in prilling process. ANSYS 14.0 CFD package is used to simulate and Design Modeler and Catia V5 are used for geometrical model of the perforated prilling bucket. Velocity distribution on different planes are obtained and discussed.

scholarly journals Effect of Gas Volume Fraction on the Gas-Phase Distribution in the Passage and Blade Surface of the Axial Flow Screw-Type Oil-Gas Multiphase Pump

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 760
Author(s):  
Guangtai Shi ◽  
Sijia Tao ◽  
Xiaobing Liu ◽  
Haigang Wen ◽  
Zekui Shu
Keyword(s):  
Gas Phase ◽  
Volume Fraction ◽  
Phase Distribution ◽  
Axial Flow ◽  
Distribution Area ◽  
Phase Volume ◽  
Multiphase Pump ◽  
Gas Volume Fraction ◽  
Gas Volume ◽  
Oil Gas

The axial flow screw-type oil-gas multiphase pump is mainly applied to oil and gas transport in the deep sea. In the process of transporting the multiphase medium, the gas volume fraction (GVF) on the gas phase changes from time-to-time, resulting in the performance of the oil-gas multiphase pump being greatly influenced by the gas phase. This paper presents a detailed analysis of the gas-phase distribution law and the vortex distribution in the flow passages within the oil-gas multiphase pump by means of numerical calculations, supplemented by experimental verification. The results show that the gas phase is mainly concentrated in the diffuser at different GVFs, and the gas phase gathering in the diffuser becomes more significant with the increase in the GVF. The gas-phase volume fraction increases gradually from rim to hub, that is, the gas-phase gathering degree increases. The maximum gas-phase volume distribution area is mainly concentrated in the area near the hub of the diffuser inlet and the middle blade height area at the outlet of the diffuser. The flow in the impeller is relatively stable under the different GVFs, while there is a large vortex near the inlet of the diffuser near the hub, and there is a backflow phenomenon between the outlet of the diffuser and the tip clearance of the impeller. The volume fraction of the gas phase near the rim fluctuates more than that near the hub because the gas phase is squeezed by the liquid phase more violently. The research results can provide theoretical guidance for the optimal design of oil-gas multiphase pump blades.

CFD Applied for the Identification of Stiffness and Damping Properties for Smooth Annular Turbomachinery Seals in Multiphase Flow

2016 ◽  
Author(s):  
Andreas Jauernik Voigt ◽  
Piero Iudiciani ◽  
Kenny Krogh Nielsen ◽  
Ilmar F. Santos
Keyword(s):  
Multiphase Flow ◽  
Volume Fraction ◽  
Bubbly Flow ◽  
Primary Phase ◽  
Test Facility ◽  
Liquid Volume ◽  
Shear Stresses ◽  
Liquid Volume Fraction ◽  
Wet Gas ◽  
Stiffness And Damping

This paper presents a first venture into quantifying stiffness and damping coefficients for turbomachinery seals in multiphase flow using Computational Fluid Dynamics (CFD). The study focusses on the simplest seal type: the smooth annular seal. The investigation is conducted for both wet-gas and bubbly flow regimes in which the primary phase is gas (air) and liquid (water), respectively. For the wet gas regime three different Liquid Volume Fraction (LVF) conditions are included in the study; 5%, 3% and 0%. Similarly for the bubbly flow regime three Gas Volume Fractions (GVF) conditions are included; 5%, 3% and 0%. An Eulerian-Eulerian modelling approach is taken, applying an inhomogeneous model, where the primary phase is treated as continuous and the secondary phase is included as dispersed. The Instationary Perturbation Method (IPM) is applied to identify the rotordynamic coefficients, in which the rotor is harmonically perturbed, and forces acting on the rotor are quantified through integration of the pressure and shear stresses. The perturbation is repeated for different frequencies to uncover any frequency dependence. The results presented in this paper are intended as an initial comparison basis for the experimental results to be obtained by applying the multiphase seal test facility currently in development, as part of a collaboration between Lloyd’s Register Consulting, the Technical University of Denmark, OneSubsea, TOTAL and Statoil.

The CFD Analysis of Internal Flow Field in Turbocharger Compressor

2014 ◽  
Vol 628 ◽  
pp. 279-282 ◽  
Author(s):  
Xiang Ling Liu ◽  
Liao Ping Hu ◽  
Jin Ke Gong ◽  
Jia Qiang E
Keyword(s):  
Flow Field ◽  
Optimization Design ◽  
Gasoline Engine ◽  
Flow Analysis ◽  
Internal Flow ◽  
Field Analysis ◽  
Analysis Model ◽  
Vaneless Diffuser ◽  
Flow Field Analysis ◽  
Cfd Method

In this paper, the 3D flow analysis model of gasoline engine turbocharger compressor was built by using the software NUMECA. The flow fields of the vaneless diffuser and volute, such as airflow velocity field, temperature field, pressure field and the entropy field were simulated. The internal flow performance of the vaneless diffuser and volute were analyzed. The simulation results show that the field changes accord with the compressor characteristics, thus the vaneless diffuser and volute of the compressor design is reasonable. The approach of numerical simulation and flow field analysis by using CFD method can accurately predict the compressor performance. The research methods and conclusions provide theoretical and practical reference for the optimization design of the compressor.

scholarly journals Numerical and Experimental Research on Convergence Angle of Wet Sprayer Nozzle

2018 ◽  
Vol 4 (9) ◽  
pp. 1985 ◽  
Author(s):  
Chang Su ◽  
Yun-hai Cheng
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Flow Field ◽  
Distribution System ◽  
Volume Fraction ◽  
Internal Flow ◽  
Outlet Section ◽  
Validity And Reliability ◽  
Phase Volume Fraction ◽  
Nozzle Structure

Shotcrete is a popular support method in construction of both ground projects and underground projects, such as tunnels, subways, slopes and roadway, etc. However, at present researches on the influence of nozzle structure parameters on the performance of concrete injection are insufficient. This research focuses on the influence of various parameters of nozzle structure on the evenness and dust generating, and conducts a systematic study on the flow characteristics of the concrete in the nozzle of wet spraying machinery and the quality control law, through a comprehensive research method combining theoretical analysis, numerical simulation and field tests. On the basis of dynamic analysis of the internal flow field of the nozzle, the mathematical model and numerical model of the internal flow field of the nozzle are establishes. Then the simulation calculation of the flow field of the wet spray nozzle is conducted with the FLUENT® software. The fluid’s contour about velocity and phase volume fraction in the nozzle were obtained. On this basis this paper analyzed each phase’s volume fraction of the mixed fluid in the outlet section. The convergent section of the nozzle is tested in the spray concrete impact force distribution system. The results are in good correspondence with the results of theoretical analysis and numerical simulation, which verifies the validity and reliability of the conclusion of numerical simulation. This paper provides the basis for the optimization of nozzle structure, and the improvement of the sprayed concrete construction quality.

Sign in / Sign up

Export Citation Format

Share Document