scholarly journals Three-objective optimization of a mixed-flow pump impeller for improved suction performance and efficiency

2019 ◽  
Vol 11 (12) ◽  
pp. 168781401989896 ◽  
Author(s):  
Sung Kim ◽  
Yong-In Kim ◽  
Jin-Hyuk Kim ◽  
Young-Seok Choi
Keyword(s):  
Design Optimization ◽  
Design Flow ◽  
Meridional Plane ◽  
Angle Distribution ◽  
Blade Angle ◽  
Mixed Flow ◽  
Pump Impeller ◽  
Design Variables ◽  
Suction Performance ◽  
Flow Pump

In this article, design optimization was carried out to improve the suction performance and efficiency of a mixed-flow pump impeller. Commercial computational fluid dynamics code and a response surface method were used in the optimization to design a mixed-flow pump impeller. When it comes to a mixed-flow pump, the two main research objectives namely efficiency and suction performance tend to contradict. It is very important that the design technology improves the suction performance while maintaining high efficiency. Meridional plane and vane plane development variables were defined in the design of the impeller. The meridional plane expresses the shapes and sizes of the blades, while the vane plane development describes the impeller inlet and outlet angles as well as the blade angle distribution. The blade angle distribution of the impeller was designed using the traditional method by which inlet and outlet angles are connected smoothly. The surface response method was applied to the design variables of the impeller inlet part in this design optimization because they influence the performance of the mixed-flow pump. Objective functions were set to satisfy the total head at the design flow rate as well as to improve efficiency and suction performance. Design variables of the impeller inlet part of the mixed-flow pump and the changes in performance were analyzed in order to produce the optimal shape. The performance of the optimally designed shape was verified by numerical analysis, and the reliability of the test result was checked by comparative analysis against the reference model.

scholarly journals A Numerical Study on the Improvement of Suction Performance and Hydraulic Efficiency for a Mixed-Flow Pump Impeller

2014 ◽  
Vol 2014 ◽  
pp. 1-17 ◽  
Author(s):  
Sung Kim ◽  
Kyoung-Yong Lee ◽  
Jin-Hyuk Kim ◽  
Young-Seok Choi
Keyword(s):  
Numerical Analysis ◽  
Numerical Study ◽  
Incidence Angle ◽  
Meridional Plane ◽  
Total Efficiency ◽  
Hydraulic Efficiency ◽  
Mixed Flow ◽  
Design Variables ◽  
Suction Performance ◽  
Flow Pump

This paper describes a numerical study on the improvement of suction performance and hydraulic efficiency of a mixed-flow pump by impellers. The design of these impellers was optimized using a commercial CFD (computational fluid dynamics) code and DOE (design of experiments). The design variables of meridional plane and vane plane development were defined for impeller design. In DOE, variables of inlet part were selected as main design variables in meridional plane, and incidence angle was selected in vane plane development. The verification of the experiment sets that were generated by2kfactorial was done by numerical analysis. The objective functions were defined as the NPSHre (net positive suction head required), total efficiency, and total head of the impellers. The importance of the geometric design variables was analyzed using2kfactorial designs. The interaction between the NPSHre and total efficiency, according to the meridional plane and incidence angle, was discussed by analyzing the2kfactorial design results. The performance of optimally designed model was verified by experiments and numerical analysis and the reliability of the model was retained by comparison of numerical analysis and comparative analysis with the reference model.

Design Optimization for the Hydraulic Efficiency Improvement of a Mixed-Flow Pump Diffuser

2015 ◽  
Author(s):  
Sung Kim ◽  
Kyoung-Yong Lee ◽  
Ji-Hyuk Kim ◽  
Young-Seok Choi
Keyword(s):  
Design Optimization ◽  
Meridional Plane ◽  
Total Efficiency ◽  
Mixed Flow ◽  
Design Variables ◽  
Total Head ◽  
Blade Shape ◽  
Computational Fluid Dynamics Cfd ◽  
Geometric Variables ◽  
Flow Pump

In this paper, design optimization for mixed-flow pump diffusers was carried out using a commercial computational fluid dynamics (CFD) code and design-of-experiments (DOE). The design variables of meridional plane and vane plane development were defined for the diffuser design. The blade shape of the diffuser was designed using the traditional method, in which the inlet and exit angles are connected smoothly. First, the design optimization of the defined design variables for vane plane development was achieved. Next, design optimization of the defined design variables for the meridional plane was performed. The objective functions were defined as the total head and total efficiency of the diffusers. The importance of the geometric design variables was analyzed using 2k factorial designs, and the design optimization of the geometric variables was determined using the response surface method (RSM). The numerical results for reference and optimum models in this work were compared and discussed.

scholarly journals Multi-objective optimization of a high efficiency and suction performance for mixed-flow pump impeller

2019 ◽  
Vol 13 (1) ◽  
pp. 744-762 ◽  
Author(s):  
Jun-Won Suh ◽  
Hyeon-Mo Yang ◽  
Yong-In Kim ◽  
Kyoung-Yong Lee ◽  
Jin-Hyuk Kim ◽  
...  
Keyword(s):  
High Efficiency ◽  
Multi Objective Optimization ◽  
Mixed Flow ◽  
Pump Impeller ◽  
Multi Objective ◽  
Suction Performance ◽  
Flow Pump

Conceptual design optimization of mixed-flow pump impellers using mean streamline analysis

2001 ◽  
Vol 215 (1) ◽  
pp. 133-138 ◽  
Author(s):  
H. W. Oh ◽  
K-Y Kim
Keyword(s):  
Design Optimization ◽  
Conceptual Design ◽  
Fluid Dynamic ◽  
Optimal Solution ◽  
Preliminary Design ◽  
Mixed Flow ◽  
Design Variables ◽  
Mean Streamline Analysis ◽  
Dynamic Variables ◽  
Flow Pump

A conceptual design optimization code for mixed-flow pump impellers has been developed to determine the geometric and fluid dynamic variables under appropriate design constraints. In the present study the optimization problem has been formulated with a non-linear objective function to minimize the fluid dynamic losses. The optimal solution is obtained by means of the Hooke-Jeeves direct search method. Computations are performed using mean streamline analysis and the present state-of-the-art loss correlations. Changes in the optimized efficiency and design variables of mixed-flow pump impellers are presented in this paper as a function of non-dimensional specific speed in the range 1.9 ≤ Ns ≤ 2.5. The diagrams presented herein can be used efficiently in the preliminary design phase of mixed-flow pump impellers.

scholarly journals Numerical study on the cavitation phenomenon for the head drop and unsteady bubble patterns with a difference in the incidence angle of a mixed-flow pump

2020 ◽  
Vol 12 (4) ◽  
pp. 168781402091479 ◽  
Author(s):  
Yong-In Kim ◽  
Hyeon-Mo Yang ◽  
Jun-Won Suh ◽  
Sung Kim ◽  
Kyoung-Yong Lee ◽  
...  
Keyword(s):  
Numerical Study ◽  
Incidence Angle ◽  
Experimental Tests ◽  
Design Flow ◽  
Inlet Pressure ◽  
Mixed Flow ◽  
Bubble Generation ◽  
Cavitation Phenomenon ◽  
Suction Performance ◽  
Flow Pump

In this study, two types of mixed-flow pump models exhibiting different suction performances were investigated to understand the cavitation characteristics of head drop gradients due to the decrease in inlet pressure. Both models were designed with the same specifications except for the shroud inlet blade angle and inlet radius which directly affect the incidence angle. The steady- and unsteady-state analyses were performed using ANSYS CFX, and the results of both models were compared. Bubble generation and patterns were systemically represented at the design flow rate to observe their influence on suction performance. Furthermore, experimental tests were performed to validate the numerical results. From the results, the head drop gradient can determine the suction performance of mixed-flow pumps. The amount and shape of the bubbles concerning the suction performance of a mixed-flow pump exhibit significant differences with the changes in time and inlet pressure. The patterns of generated bubble are not stable even for each blade.

Effect of Tip Clearance on Suction Performance at Different Flow Rates in a Mixed Flow Pump

2014 ◽  
Author(s):  
Yo Han Jung ◽  
Young Uk Min ◽  
Jin Young Kim
Keyword(s):  
Performance Test ◽  
Stokes Equations ◽  
Flow Characteristics ◽  
Tip Clearance ◽  
Low Flow ◽  
Tip Leakage Flow ◽  
Mixed Flow ◽  
Flow Rates ◽  
Suction Performance ◽  
Flow Pump

This paper presents a numerical investigation of the effect of tip clearance on the suction performance and flow characteristics at different flow rates in a vertical mixed-flow pump. Numerical analyses were carried out by solving three-dimensional Reynolds-averaged Navier-Stokes equations. Steady computations were performed for three different tip clearances under noncavitating and cavitating conditions at design and off-design conditions. The pump performance test was performed for the mixed-flow pump and numerical results were validated by comparing the experimental data for a system characterized by the original tip clearance. It was shown that for large tip clearance, the head breakdown occurred earlier at the design and high flow rates. However, the head breakdown was quite delayed at low flow rate. This resulted from the cavitation structure caused by the tip leakage flow at different flow rates.

Multi-Objective Design Optimization of a Mixed-Flow Pump

2009 ◽  
Author(s):  
Yumiko Takayama ◽  
Hiroyoshi Watanabe
Keyword(s):  
Performance Characteristic ◽  
Performance Characteristics ◽  
Inverse Design ◽  
Surface Model ◽  
Objective Functions ◽  
Mixed Flow ◽  
Multi Objective ◽  
Design Variables ◽  
Flow Head ◽  
Flow Pump

In most cases of high specific speed mixed-flow pump applications, it is necessary to satisfy more than one performance characteristic such as deign point efficiency, shut-off power/head and non-stall characteristic (no positive slope in flow-head curve). However, it is known that these performance characteristics are in relation of trade-offs. As a result, it is difficult to optimize these performance characteristics by conventional way such as trial and error approach by modifying geometrical parameters. This paper presents the results of the multi-objective optimization strategy of mixed-flow pump design by means of three dimensional inverse design approach, Computational Fluid Dynamics (CFD), Design of Experiments (DoE), response surface model (RSM) and Multi Objective Genetic Algorism (MOGA). The parameters to control blade loading distributions and meridional geometries for impeller and diffuser blades in inverse design were chosen as design variables of the optimization process. Pump efficiency, maximum slope in flow-head curve and shut-off power/head were selected as objective functions. Objective functions of pumps, designed by design variables specified in DoE, were evaluated by using CFD. Then, trade-off relations between objective functions were analyzed by using Pareto fronts obtained by MOGA. Some pumps which have specific performance characteristic (non-stall, low shut-off power, high efficiency etc.) designed along the Pareto front were numerically evaluated.

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