Development of High-Efficient Centrifugal Pump Through Optimization of Its Volute Tongue and Expeller Vane

2021 ◽  
Author(s):  
Abubaker Ahmed Mohammed Mohammedali ◽  
Ki-Seong Kim
Keyword(s):  
Centrifugal Pump ◽  
Design Parameters ◽  
Outer Diameter ◽  
Hydraulic Efficiency ◽  
Centrifugal Pumps ◽  
Axial Thrust ◽  
High Efficient ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Optimization ◽  
Good Agreement

Abstract Centrifugal pumps are often used for pumping liquids from one priority area to another, which require to work effectively in terms of performance and reliability. The objective of this study is enhancing the hydraulic performance and reliability of a centrifugal pump based on computational fluid dynamics (CFD) optimization. The shapes of expeller vane and volute tongue were optimized based on the following six design parameters; outer diameter, exit angle, front and rear heights, back sidewall gap, and tongue angle. The hydraulic efficiency and axial thrust were chosen as the optimization objectives. In this sense, a design of experiment (DOE) technique was utilized to generate 45 design samples. A response surface modeling (RSM) approach was employed to investigate the interaction between the parameters and objectives. The accuracy of the numerical simulation was verified by the experimental data and showed a good agreement. The optimization was found to improve the hydraulic efficiency by 2.92%, whereas the axial thrust was decreased by 7.51%.

Investigation of a Centrifugal Pump Stage With Radial Impeller and a Pump Stage With Small Stage Diameter

2006 ◽  
Author(s):  
Andreas Weiten ◽  
Dieter-H. Hellmann
Keyword(s):  
Centrifugal Pump ◽  
Dynamic Performance ◽  
Axial Direction ◽  
Outer Diameter ◽  
Centrifugal Pumps ◽  
Axial Thrust ◽  
Vaned Diffuser ◽  
Pump Stage ◽  
Radial Pump ◽  
Inner Diameter

For radial multistage centrifugal pumps a combination of a radial exiting impeller, a vaned diffuser and a row of return guide vanes is used for each stage of the pump. Hence the inner diameter of the stage casing is much larger than the diameter of the impeller. In case when the space for installing the pump is limited, for example in case of submersible pumps, a high number of pump stages is necessary to produce a sufficient hydraulic head. Pump stages with an impeller diameter equal to the inner diameter of the casing can reduce the number of the stages, but up to now the efficiency of such pumps is lower than the one of a conventional pump. Improving the design of these pumps in order to increase efficiency, stationary diffusers were developed at the Institute for Turbomachinery and Fluid mechanics at TU Kaiserslautern. While the pump liquid cannot exit the impeller in radial direction, the hub diameter is reduced by the width of the impeller at the outer diameter. Hence the pump liquid now exits the impeller in axial direction. This design affects both the hydraulic and the rotor dynamic performance of the pump. Furthermore the axial thrust has dropped, because the flow and the allocation of static pressure in the impeller side spaces has changes compared to radial pump stages. In this paper results of measurements of vibration and axial thrust at radial centrifugal pump with four stages are compared with these of a four stage pump with small stage diameter. Furthermore the hydraulic datas of both designs a presented.

Flow Numerical Simulation of Centrifugal Pump with Splitting Blades Based on RE

2010 ◽  
Vol 43 ◽  
pp. 691-694
Author(s):  
Nai Fei Ren ◽  
Ming Min Chen ◽  
Jie Jiang ◽  
Li Cheng
Keyword(s):  
Centrifugal Pump ◽  
Performance Prediction ◽  
Research Method ◽  
Characteristic Curve ◽  
Internal Flow ◽  
Centrifugal Pumps ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
The Law ◽  
Good Agreement

The structure of the centrifugal pump with splitting blades is complex, and the law of the internal flow is not fully grasped. Therefore Reverse Engineering (RE) and numerical simulations of Computational Fluid Dynamics (CFD) are adopted to study the centrifugal pumps with splitter blades. In this process, the law of velocity and pressure distribution of internal flow about the centrifugal pump with splitter blades is preliminary disclosed. In addition, performance prediction was carried out in centrifugal pumps. Comparing to the calculation curve and text characteristic curve, it’s obvious that simulation results are in good agreement with experimental results. The results verify the reliability and feasibility of the research method.

Application of biharmonic equation in impeller profile optimization design of an aero-centrifugal pump

2019 ◽  
Vol 36 (5) ◽  
pp. 1764-1795 ◽  
Author(s):  
Xianwei Liu ◽  
Huacong Li ◽  
Xinxing Shi ◽  
Jiangfeng Fu
Keyword(s):  
Centrifugal Pump ◽  
Surrogate Model ◽  
Biharmonic Equation ◽  
Optimization Design ◽  
Design Parameters ◽  
Surface Model ◽  
Hydraulic Efficiency ◽  
Blade Profile ◽  
Content Type ◽  
Profile Optimization

Purpose The purpose of this paper is to improve the hydraulic efficiency without changing the overall dimension. The blade profile optimization design of the aero-centrifugal pump based on the biharmonic equation surrogate model has been studied. Design/methodology/approach First of all, Bezier curves and linear function are used to control the annular angle distribution and the stacking angle of blade profile under the MATLAB platform. Grid independence analysis has been studied to find the finest mesh scheme. After the precision comparison of test data and computation fluid dynamics 15 sets of design parameters are carried out as the boundary condition of the biharmonic equation. The efficiency surrogate model of the biharmonic equation is constructed via iteratively solving of a discrete difference equation. The other two surrogate models of response surface model (RSM) and radial basis function neural network surrogate model (RBFNNSM) are compared with the biharmonic equation surrogate model by the standard of modified complex correlation coefficient R2 and root mean square deviation (RSME). Finally, the artificial fish swarm algorithm has been used to find the global optimal design parameters with the objective function of highest efficiency. Findings The results show that the design parameters code conversion method can reduce the number of optimization parameters from five to three, makes the design space become a cube, and compared with RSM and RBFNNSM, the biharmonic equation surrogate model has higher precision with R2 is 0.8958, RSME is 0.1382. The final optimum result of AFSA is at the point of [1 −1 −1]. The internal flow field analysis shows that after optimization the outlet relative velocity becomes more uniform and the wake effect has been significantly decreased. The hydraulic efficiency of the optimized pump is about 59.45 per cent increasing 5.4 per cent compared with a prototype pump. Originality/value This study developed a new method to optimize the design parameters of aero-centrifugal pump impeller based on biharmonic equation surrogate model, which had a good agreement with experimental values within just 15 sets of the original design. The optimization results shows that the method can improve the hydraulic efficiency significantly.

Numerical Simulation of Cavitation Phenomena in a Centrifugal Pump

2009 ◽  
Author(s):  
Freddy Jeanty ◽  
Jesu´s De Andrade ◽  
Miguel Asuaje ◽  
Frank Kenyery ◽  
Auristela Va´squez ◽  
...  
Keyword(s):  
Experimental Data ◽  
Centrifugal Pump ◽  
Cfd Simulation ◽  
Common Phenomenon ◽  
Performance Parameters ◽  
Centrifugal Pumps ◽  
Cavitation Model ◽  
Cfd Simulations ◽  
Global Performance ◽  
Good Agreement

Cavitation is a common phenomenon that appears during the operation of the hydraulic turbomachines reducing performance and life of Centrifugal pumps. The main goal of this work is primarily a CFD-simulation of the whole Centrifugal Pump-Turbine including the suction cone, impeller, diffuser blades and volute, in order to characterize and evaluate its performance under cavitation conditions. The CFD simulations results were compared with experimental data under cavitation and non-cavitation conditions. A good agreement has been obtained under non-cavitation conditions for global performance parameters. After the implementation of the Rayleigh Plesset cavitation model, the required Net Positive Suction Head (NPSHr) has been predicted from CFD simulations. Finally, a full cavitation test can be reproduced for a Hydraulic Turbomachine to avoid this dangerous phenomenon.

scholarly journals Influence of Balance Hole Diameter on Leakage Flow of the Balance Chamber in a Centrifugal Pump

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wei Dong ◽  
Diyi Chen ◽  
Jian Sun ◽  
Yan Dong ◽  
Zhenbiao Yang ◽  
...  
Keyword(s):  
Centrifugal Pump ◽  
Axial Force ◽  
Flow Rate ◽  
Volume Flow Rate ◽  
Vortex Motion ◽  
Internal Flow ◽  
Hole Diameter ◽  
Leakage Flow ◽  
Centrifugal Pumps ◽  
Axial Thrust

The balancing holes in centrifugal pumps with seals mounted in both suction and discharge sides are one of the approaches used by pump manufacturers to reduce the axial thrust. The balance hole diameter directly affects the axial force of the centrifugal pump. The flow characteristics in the balance chamber are closely related to the balance hole diameter. However, research is not very clear on the internal flow of the balanced chamber, due to the small axial and radial sizes and the complicated flow conditions in the chamber. In this paper, we analyzed the influence of the balance hole diameter on the liquid leakage rate, flow velocity, and vortex motion in the balance chamber. The results indicated that when the balance hole diameter was lower than the design value, the volume flow rate of leakage flow was proportional to the diameter. The liquid flow rate and vortex distribution rules in the balance chamber were mainly associated with the coeffect of radial leakage flow in the rear sealing ring interval and the axial balance hole leakage flow. The research has revealed the mechanisms of leakage flow of the balance chamber in the centrifugal pump and that this is of great significance for accurate calculation and balancing of the axial force.

scholarly journals Modeling and Efficiency Prediction of Aeroengine Centrifugal Pump Integrated Loss Model Based on One-Dimensional Flow

2018 ◽  
Vol 36 (5) ◽  
pp. 807-815
Author(s):  
Jiangfeng Fu ◽  
Huacong Li ◽  
Ding Fan ◽  
Wenbo Shen ◽  
Xianwei Liu
Keyword(s):  
Experimental Data ◽  
Centrifugal Pump ◽  
Relative Error ◽  
Performance Prediction ◽  
Design Parameters ◽  
Hydraulic Loss ◽  
Pump Efficiency ◽  
Centrifugal Pumps ◽  
Loss Model ◽  
Cfd Method

This paper was presented a method of integrated loss model by considering all kinds of loss type in centrifugal pumps. The geometric structure and loss mechanism of the flow parts in the centrifugal pump were analyzed, such as suction chamber, impeller, vaneless diffuser chamber, volute type water collecting chamber and outlet diffusion section. The hydraulic loss model, volume loss model, friction loss and mechanical loss model of centrifugal pump were established respectively by combining the flow theory. Finally, an integrated loss model of centrifugal pump was constructed, which can establish the relationship between the 12 main design parameters and pump efficiency of the centrifugal pump. Then the performance prediction of an aeroengine fuel centrifugal pump was carried out based on the loss model, and the loss model predictions were compared with the experimental data and CFD simulation performance prediction data. Simulation results show that:The efficiency predicted value relative error of centrifugal pump is less than 2.8% between the loss model and the experimental data. The computational efficiency of CFD is less than 4.4% compared with the experimental data in the design condition. The relative error is about 1.6% between the CFD method and the loss model which shows that the loss model predicts efficiency accuracy is better than the CFD method. It shows that this method can be used to predict the efficiency performance of centrifugal pump under design process.

Experimental Performance Evaluation of a Centrifugal Pump With Different Impeller Vane Geometries

2014 ◽  
Author(s):  
Susanta K. Das
Keyword(s):  
Centrifugal Pump ◽  
Computer Control ◽  
Operating Conditions ◽  
Design Parameters ◽  
Physical Parameters ◽  
Pump Efficiency ◽  
Centrifugal Pumps ◽  
Pump Performance ◽  
Pump Speed ◽  
Geometry Effects

Centrifugal pumps vane geometry plays an important role in pump’s overall performance. Thus, to know the impeller vane geometry effects on the performance of a centrifugal pump are essential from pump’s design point of view. In this study, an experimental investigation is carried out to judge the impeller vane geometry effects on the performance of a centrifugal pump. The performance of three different impeller vane geometries is evaluated in this investigation. To acquire pump performance and characteristics curves, inlet and outlet valves were manually adjusted and the pump’s rpm were varied remotely through computer control. The pressure data were obtained via installed flow rotameter for different flow rates with constant pump speed – 1800 rpm. Experimental data were used to calculate different physical parameters, such as the pump head, water horsepower — the power added to the fluid, power input to the pump–brake horse power, and pump efficiency for each of impeller vane geometries. The pump’s performance curves and the system curves were then plotted for each of the vane geometries. The results show that the pump performance as well as efficiency varies significantly for each of the impeller vane geometries. The results help to understand how to determine appropriate operating conditions and design parameters for different impeller vane geometries for obtaining optimized pump performance.

An analytical method for determining the optimum number of blades of the compound impeller in a low specific speed centrifugal pump

2020 ◽  
Vol 234 (6) ◽  
pp. 576-587
Author(s):  
Yu-Liang Zhang ◽  
Wen-Guang Li
Keyword(s):  
Centrifugal Pump ◽  
Analytical Method ◽  
Full Length ◽  
Optimum Number ◽  
Centrifugal Pumps ◽  
Design Point ◽  
Closed Type ◽  
Low Specific Speed ◽  
Specific Speed ◽  
Good Agreement

Reasonable methods for determining the optimum number of blades in a low specific speed centrifugal pump with closed-type impeller with splitters, i.e. compound impeller have been rather rare in the literature so far. In the article, a new analytical method was put forward to determine such an optimum number of blades by including the effect of turbulent boundary layer over impeller blades. Three conventional impellers with different numbers of full-length blades and two compound impellers with different numbers of splitters were designed and manufactured. The corresponding performance tests were then conducted. Results showed that the optimum numbers of blades exist for two kinds of impeller in terms of head at design point, pump efficiencies at design point and best efficiency point, and slope of head-flow rate curve at shut-off point. The estimated optimum numbers of blades are in good agreement with the numbers based on the experiments. The conventional impellers with full-length blades are more prone to the hump phenomenon than the compound impellers at the optimum numbers of blades. For the compound impellers, however, the hump effect is negligible at the optimum number of blades, and their head and efficiency are higher than those for the impellers with full-length blades. The method is applicable to compound impeller design in low specific speed centrifugal pumps.

Numerical Simulations on Assembly Modifications for Annular Casing of One Centrifugal Pump

2012 ◽  
Vol 516-517 ◽  
pp. 966-969
Author(s):  
Yi Zhang Fan ◽  
Zhi Gang Zuo ◽  
Shu Hong Liu ◽  
Yu Jun Sha ◽  
Yu Lin Wu
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
High Temperature ◽  
Numerical Simulations ◽  
Centrifugal Pump ◽  
Radial Force ◽  
Hydraulic Efficiency ◽  
Centrifugal Pumps ◽  
Safety Factors ◽  
Simulation Results

Centrifugal pumps adopt annular casings instead of volute casings when working in high temperature and high pressure conditions, which results in conservative safety factors in sacrifice of hydraulic efficiency. This paper presents numerical simulations on two assembly modification methods for one annular casing imitating the volute casing to improve hydraulic performance. Method one was the eccentric axis method. Method two was the extended vane method. Numerical simulation results, given by CFX, showed that both the two method could increase the hydraulic efficiency and head while rise in radial force was small.

Multiparameter and multiobjective optimization design of centrifugal pump based on orthogonal method

2016 ◽  
Vol 231 (14) ◽  
pp. 2569-2579 ◽  
Author(s):  
Yun Xu ◽  
Lei Tan ◽  
Shuliang Cao ◽  
Wanshi Qu
Keyword(s):  
Multiobjective Optimization ◽  
Centrifugal Pump ◽  
Optimization Design ◽  
High Efficiency ◽  
Design Parameters ◽  
Pump Efficiency ◽  
Centrifugal Pumps ◽  
Range Analysis ◽  
Orthogonal Method ◽  
Cavitation Performance

Optimization design of centrifugal pumps involving multiple parameters and objectives is a complicated research topic. The orthogonal method is introduced in the present study to find a high efficiency and low cost way in the optimization process of a centrifugal pump. A orthogonal table designation L16(45) is established, in which 16 individuals of impellers are generated with five design parameters: blade wrap angle, blade angles at impeller inlet and outlet, blade leading edge position, and blade trailing edge lean varying at four levels for each parameter. To realize the multiobjective optimization of both pump efficiency and cavitation performance, an integrated factor considering the weight of two objectives is introduced. On the basis of validated computational fluid dynamics (CFD) technique, the range analysis gives the influence order of five parameters and also determines the value of each parameter. Finally, the optimal centrifugal pump is obtained with remarkable superiority on the efficiency of 3.09% rise and cavitation performance of 1.45 m promotion in comparison with the original pump.

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