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.

scholarly journals Effect of the Gas Volume Fraction on the Pressure Load of the Multiphase Pump Blade

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 650
Author(s):  
Guangtai Shi ◽  
Dandan Yan ◽  
Xiaobing Liu ◽  
Yexiang Xiao ◽  
Zekui Shu
Keyword(s):  
Flow Rate ◽  
Static Pressure ◽  
Volume Fraction ◽  
Pump Impeller ◽  
Impeller Blade ◽  
Multiphase Pump ◽  
Pressure Load ◽  
Gas Volume Fraction ◽  
Power Capability ◽  
Gas Volume

The gas volume fraction (GVF) often changes from time to time in a multiphase pump, causing the power capability of the pump to be increasingly affected. In the purpose of revealing the pressure load characteristics of the multiphase pump impeller blade with the gas-liquid two-phase case, firstly, a numerical simulation which uses the SST k-ω turbulence model is verified with an experiment. Then, the computational fluid dynamics (CFD) software is employed to investigate the variation characteristics of static pressure and pressure load of the multiphase pump impeller blade under the diverse inlet gas volume fractions (IGVFs) and flow rates. The results show that the effect of IGVF on the head and hydraulic efficiency at a small flow rate is obviously less than that at design and large flow rates. The static pressure on the blade pressure side (PS) is scarcely affected by the IGVF. However, the IGVF has an evident effect on the static pressure on the impeller blade suction side (SS). Moreover, the pump power capability is descended by degrees as the IGVF increases, and it is also descended with the increase of the flow rate at the impeller inlet. Simultaneously, under the same IGVF, with the increase of the flow rate, the peak value of the pressure load begins to gradually move toward the outlet and its value from hub to shroud is increased. The research results have important theoretical significance for improving the power capability of the multiphase pump impeller.

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.

Finite Element Analysis and Multi-Objective Optimization of the Precision Horizontal Machining Center Bed

2014 ◽  
Vol 889-890 ◽  
pp. 130-134
Author(s):  
Xue Yan Li ◽  
Wen Tie Niu ◽  
Jun Qiang Wang ◽  
Ling Jun Xue
Keyword(s):  
Response Surface ◽  
Response Surface Model ◽  
Least Square ◽  
Surface Model ◽  
Multi Objective Optimization ◽  
Element Analysis ◽  
Maximum Deformation ◽  
Multi Objective ◽  
Machining Center ◽  
Sample Points

In order to improve dynamic and static performance of the precision horizontal machining center, the method of multi-objective optimization based on the response surface model was applied for optimizing design of the bed structure. The design variables were the layout parameters of the rib plates. Sample points were obtained by the Box-Behnken design experiment, and responses of sample points were analyzed by SAMCEF. The maximum deformation of guide rails and the low-order natural frequency were extracted to fit the response surface model by least square method. The layout parameters of the rib plates were optimized through the application of multi-objective genetic algorithms. Then, relationship between the lightening holes and the performance were analyzed to determine the suitable diameter. The results verify the validity of the optimization method, and the paper provides methodological guidance for optimization of machine tool structural parts.

Multi-objective shape optimization of helico-axial multiphase pump impeller based on NSGA-II and ANN

2011 ◽  
Vol 52 (1) ◽  
pp. 538-546 ◽  
Author(s):  
Jinya Zhang ◽  
Hongwu Zhu ◽  
Chun Yang ◽  
Yan Li ◽  
Huan Wei
Keyword(s):  
Shape Optimization ◽  
Nsga Ii ◽  
Pump Impeller ◽  
Multiphase Pump ◽  
Multi Objective ◽  
Objective Shape

Multi-Objective Design Optimisation of a Diffuser-Ejector Exhaust Duct for Helicopter Engines

2010 ◽  
Author(s):  
J. Gra¨sel ◽  
J. Demolis ◽  
H. Mohr ◽  
H.-P. Schiffer
Keyword(s):  
Response Surface ◽  
Pressure Recovery ◽  
Surface Model ◽  
Shape Optimisation ◽  
Trial And Error ◽  
Entrainment Ratio ◽  
Multi Objective ◽  
Exhaust Duct ◽  
Parameter Constraints ◽  
Operating Points

The paper demonstrates the successful application of an optimisation methodology for the design of a diffuser-ejector exhaust duct. Maximising simultaneously pressure recovery and the entrainment ratio are diverging objectives which could hardly be achieved by a conventional manual trial-and-error approach relying on the designer’s experience. This multi-objective design problem has been solved for the axis-symmetric exhaust duct with a given characteristic length, inlet section and minimal standoff distance by coupling a parametric method with 2D CFD analysis. Open cubic B-splines have been employed to generate the contoured duct shape, for which the control-point vertices have been defined by a total of 17 engineering parameters. A bell mouth inlet has been chosen for the ejector inlet. The parameter constraints result from weight and integration requirements. Three characteristic engine operating points have been chosen for the multi-point and multi-objective shape optimisation. The entire process of model building, meshing, performing the 2D CFD calculation and post-processing to extract the required metrics has been fully automated. A commercial process integration software package is used to link the different tools together in a unified environment. The design space exploration is carried out via a latin-hypercube sampling technique. This random space filling method has been chosen because of its considerable lower number of experiments compared to factorial sampling techniques. Parameter ranking is obtained by a weighted average of the correlation coefficients for each objective. The parameter hierarchy is slightly different for the engine operating points. However, there exists a clear threshold separating the influential parameters from the insignificant ones. A subsequent DOE is performed for the reduced parameter set for which the minimum number of experiments has been chosen as twice the number of experiments to generate a quadratic response surface. The Normal-Boundary Intersection method is applied to find the Pareto front based on the response surface model as surrogate model. The results show that a gain of 20% for the pressure recovery for a given entrainment ratio could be achieved compared to a configuration defined by a manual trial-and-error approach. The great benefit of the present method is its capability to handle easily geometrical constraints and the weight of the different design objectives which may change even during the detailed design phase.

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.

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.

Sign in / Sign up

Export Citation Format

Share Document