Multi-objective optimization for mixed-flow pump with blade angle of impeller exit and diffuser inlet

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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Multi-Objective Optimization of a High Specific Speed Centrifugal Volute Pump Using 3D Inverse Design Coupled With CFD Simulations

Volume 3B: Fluid Applications and Systems ◽

10.1115/ajkfluids2019-4676 ◽

2019 ◽

Author(s):

Luying Zhang ◽

Gabriel Davila ◽

Mehrdad Zangeneh

Keyword(s):

Surrogate Model ◽

Design Method ◽

Inverse Design ◽

Multi Objective Optimization ◽

Blade Angle ◽

Multi Objective ◽

Specific Speed ◽

Meridional Shape ◽

Inverse Design Method ◽

Conventional Optimization

Abstract This paper presents three different multi-objective optimization strategies for a high specific speed centrifugal volute pump design. The objectives of the optimization consist of maximizing the efficiency and minimizing the cavitation while maintaining the Euler head. The first two optimization strategies use a 3D inverse design method to parametrize the blade geometry. Both meridional shape and 3D blade geometry is changed during the optimization. In the first approach Design of Experiment method is used and the efficiency computed from CFD computations, while cavitation is evaluated by using minimum pressure on blade surface predicted by 3D inverse design method. The design matrix is then used to create a surrogate model where optimization is run to find the best tradeoff between cavitation and efficiency. This optimized geometry is manufactured and tested and is found to be 3.9% more efficient than the baseline with little cavitation at high flow. In the second approach the 3D inverse design method output is used to compute the efficiency and cavitation parameters and this leads to considerable reduction to the computational time. The resulting optimized geometry is found to be similar to the more computationally expensive solution based on 3D CFD results. In order to compare the inverse design based optimization to the conventional optimization an equivalent optimization is carried out by parametrizing the blade angle and meridional shape. Two different approaches are used for conventional optimization one in which the blade angle at TE is not constrained and one in which blade angles are constrained. In both cases larger variation in head is obtained when compared with the inverse design approach. This makes it impossible to create an accurate surrogate model. Furthermore, the efficiency levels in the conventional optimization is generally lower than the inverse design based optimization.

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Experimental study of the effect of blade tip clearance and blade angle error on the performance of mixed-flow pump

Science China Technological Sciences ◽

10.1007/s11431-012-5080-6 ◽

2012 ◽

Vol 56 (2) ◽

pp. 293-298 ◽

Cited By ~ 15

Author(s):

Hao Bing ◽

ShuLiang Cao ◽

ChengLian He ◽

Li Lu

Keyword(s):

Experimental Study ◽

Tip Clearance ◽

Blade Angle ◽

Angle Error ◽

Mixed Flow ◽

Blade Tip ◽

Flow Pump ◽

Blade Tip Clearance

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Design and Test for High Specific Speed Mixed Flow Pump with Volute

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.354-355.669 ◽

2011 ◽

Vol 354-355 ◽

pp. 669-673

Author(s):

Xian Fang Wu ◽

Hou Lin Liu ◽

Ming Gao Tan ◽

Hong Hui Li

Keyword(s):

Cross Sections ◽

Flow Analysis ◽

Maximum Efficiency ◽

Blade Angle ◽

Mixed Flow ◽

Commercial Code ◽

Hydraulic Design ◽

Velocity Circulation ◽

Specific Speed ◽

Flow Pump

The characteristics and research actuality on mixed flow pumps are introduced simplely. A mixed flow pump with volute as diffusion part is designed and its specific speed is 556.8. The axial velocity circulation and blade angle variety with linearity distribution are used to deisign the impeller. The fixed diffeuser between impeller and volute is deigned by arc airfoil.The cross sections of volute are all asymmetry. The commercial code FLUENT is applied to simulate the inner flow in the mixed flow pump and its energy characteristics are predicted according to the simulation results. The inner flow analysis indicates that the flow in the pump is good and the characteristic prediction shows that the pump performance can meet the design demand. The experiment test of the pump are done. When the blade angle is about 0°, the maximum efficiency of the pump is up to 85.76% and the actual efficiency at design point is about 3% higher than demand efficiency. The study fruits can instruct the hydraulic design of higher specific speed mixed flow pump with volute as diffusion part.

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Multi-objective Optimization by Using Modified PSO Algorithm for Axial Flow Pump Impeller

Advances in Intelligent Systems and Computing - Simulation and Modeling Methodologies, Technologies and Applications ◽

10.1007/978-3-319-11457-6_16 ◽

2014 ◽

pp. 223-237

Author(s):

H. S. Park ◽

Fu-qing Miao

Keyword(s):

Axial Flow ◽

Pso Algorithm ◽

Multi Objective Optimization ◽

Pump Impeller ◽

Multi Objective ◽

Axial Flow Pump ◽

Modified Pso ◽

Flow Pump

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Research on Efficiency Test of Mixed-Flow Pump with Different Blade Angles

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.405-408.3248 ◽

2013 ◽

Vol 405-408 ◽

pp. 3248-3252

Author(s):

Sha Sha Sun ◽

Bing Feng Xu

Keyword(s):

Efficiency Analysis ◽

Pump Efficiency ◽

Blade Angle ◽

Mixed Flow ◽

The Status ◽

Efficiency Test ◽

Flow Pump

Mixed-flow pump is one of the most widely used general machinery, it is necessary to study the efficiency of the mixed-flow pump. In this paper, we have made a test on a mixed-flow pump model. After testing we got the conclusion that the mixed flow pump efficiency analysis of experiments in 6 different blade angle of operation, through the analysis of the status, to this model the suitable angle is-4 °.

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