scholarly journals Multiobjective Optimization Design and Performance Prediction of Centrifugal Pump Based on Orthogonal Test

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yuqin Wang ◽  
Xinwang Huo
Keyword(s):  
Multiobjective Optimization ◽  
Centrifugal Pump ◽  
Optimization Design ◽  
Maximum Velocity ◽  
Internal Flow ◽  
Orthogonal Test ◽  
Weight Matrix ◽  
Wake Flow ◽  
Range Analysis ◽  
Shaft Power

In order to improve the hydraulic performance of the centrifugal pump, based on the original model, the optimization mathematical model with the four indexes head, efficiency, shaft power, and pump net positive suction head as objective function was established, and the multiobjective optimization design of the centrifugal pump was carried out by orthogonal test. Based on the L1644 orthogonal table, 16 sets of orthogonal test schemes were made by selecting the four parameters impeller outlet width, blade inlet angle, blade outlet angle, and cape angle; the flow field numerical simulation was carried out by computational fluid dynamics technique; and the influence order of geometric parameters on optimization indexes was obtained by range analysis. The weight of each test factor on the optimization index was calculated by weight matrix, and a set of optimal schemes was obtained. Based on the external characteristic experimental bench of the IH 65-60-190 chemical centrifugal pump, the simulation values and test values of the prototype pump and the optimization pump were obtained under different working conditions. Under the rated flow, the head was reduced by 17.00%, the efficiency was increased by 9.14%, the shaft power was reduced by 21.50%, the pump net positive suction head was reduced by 16.69%, the curve hump was eliminated, the performance of centrifugal pump was improved, and the feasibility of the weight matrix optimization method was verified. The particle image velocimetry measurement system was used to measure the relative velocity of the internal media in the centrifugal pump. The results showed that the optimization pump had no obvious “jet-wake” flow structure, its maximum velocity was less than the prototype pump, the area of low-speed zone was larger than the prototype pump, the efficiency of the centrifugal pump was improved, and the shaft power and pump net positive suction head were reduced. The reason of the head decrease was analyzed from the internal flow situation, and the accuracy of the design optimization process was proved.

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.

scholarly journals Optimal Design of Slit Impeller for Low Specific Speed Centrifugal Pump Based on Orthogonal Test

2021 ◽  
Vol 9 (2) ◽  
pp. 121
Author(s):  
Yang Yang ◽  
Ling Zhou ◽  
Hongtao Zhou ◽  
Wanning Lv ◽  
Jian Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Large Scale ◽  
Internal Flow ◽  
Orthogonal Test ◽  
Centrifugal Pumps ◽  
Initial Model ◽  
Low Specific Speed ◽  
Specific Speed ◽  
Four Levels

Marine centrifugal pumps are mostly used on board ship, for transferring liquid from one point to another. Based on the combination of orthogonal testing and numerical simulation, this paper optimizes the structure of a drainage trough for a typical low-specific speed centrifugal pump, determines the priority of the various geometric factors of the drainage trough on the pump performance, and obtains the optimal impeller drainage trough scheme. The influence of drainage tank structure on the internal flow of a low-specific speed centrifugal pump is also analyzed. First, based on the experimental validation of the initial model, it is determined that the numerical simulation method used in this paper is highly accurate in predicting the performance of low-specific speed centrifugal pumps. Secondly, based on the three factors and four levels of the impeller drainage trough in the orthogonal test, the orthogonal test plan is determined and the orthogonal test results are analyzed. This work found that slit diameter and slit width have a large impact on the performance of low-specific speed centrifugal pumps, while long and short vane lap lengths have less impact. Finally, we compared the internal flow distribution between the initial model and the optimized model, and found that the slit structure could effectively reduce the pressure difference between the suction side and the pressure side of the blade. By weakening the large-scale vortex in the flow path and reducing the hydraulic losses, the drainage trough impellers obtained based on orthogonal tests can significantly improve the hydraulic efficiency of low-specific speed centrifugal pumps.

Optimization of a vacuum cleaner fan suction and shaft power using Kriging surrogate model and MIGA

2021 ◽  
pp. 095765092110496
Author(s):  
Soheil Almasi ◽  
Mohammad Mahdi Ghorani ◽  
Mohammad Hadi Sotoude Haghighi ◽  
Seyed Mohammad Mirghavami ◽  
Alireza Riasi
Keyword(s):  
Optimization Design ◽  
Optimization Technique ◽  
Internal Flow ◽  
Latin Hypercube Sampling ◽  
Sample Space ◽  
Geometrical Parameters ◽  
Vacuum Cleaner ◽  
Time Saving ◽  
Design Variables ◽  
Shaft Power

Optimization of vacuum cleaner fan components is a low-cost and time-saving solution to satisfy the increasing requirement for compact energy-efficient cleaners. In this study, surrogate-based optimization technique is used and for the first time it is focused on maximization of Airwatt parameter, which describes the fan suction power, as an objective function (Case II). Besides, the shaft power is minimized (Case I) as another optimization target in order to reduce the power consumption of the vacuum cleaner. 11 geometrical variables of 3 fan components including impeller, diffuser and return channel are selected as the optimization design variables. 80 training points are distributed in the sample space using Advanced Latin Hypercube Sampling (ALHS) technique and the outputs of sample points are calculated by means of CFD simulations. Kriging and RSA surrogate models have been fitted to the outputs of the sample space. Through coupling of constructed Kriging models and Multi-Island Genetic Algorithm (MIGA), the optimal design for each of the optimization cases is presented and evaluated using numerical simulations. A 20.22% reduction in shaft power in Case I and an improvement of 27.73% in Airwatt in Case II have been achieved as the overall results of this study. Despite achieving goals in both optimization cases, a slight decrease in Airwatt in Case I (−6.20%) and a slight increase in shaft power in Case II (+4.82%) are observed relative to primary fan. Furthermore, the Analysis of Variance (ANOVA) determines the importance level of design variables and their 2-way interactions on the objective functions. It was concluded that geometrical parameters related to all of the fan components must be considered simultaneously to conduct a comprehensive optimization. The reasons of enhancement in optimal cases compared with the reference design have been further investigated by analysis of the fan internal flow field. Post-processing of the CFD results demonstrates that the applied geometrical modifications cause a more uniform flow through the flow passages of the optimal fan components.

scholarly journals Multiobjective Optimization Design and Experimental Investigation on the Axial Flow Pump with Orthogonal Test Approach

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Yuquan Zhang ◽  
Yanhe Xu ◽  
Yuan Zheng ◽  
E. Fernandez-Rodriguez ◽  
Aoran Sun ◽  
...  
Keyword(s):  
Multiobjective Optimization ◽  
Frequency Analysis ◽  
Pressure Pulsation ◽  
Axial Flow ◽  
Orthogonal Test ◽  
Test Scheme ◽  
Analysis Method ◽  
Shaft Power ◽  
Axial Flow Pump ◽  
Flow Pump

A multiobjective optimization technique based on the computational fluid dynamics (CFD) simulations and the orthogonal test is proposed to reduce the pressure pulsation in this paper. Three levels of four well-known performance factors L9 (34) were considered in the orthogonal test scheme: the number of blades, the blade setting angle, the hub ratio, and the distance between the blade and the guide vane. The evaluation indexes corresponded to the head, efficiency, shaft power, and pressure pulsation, respectively. An optimal configuration A2B1C2D3 was obtained by comprehensive frequency analysis method, after intuitive and range analysis. In comparison with the nonoptimized model, the new design’s head and efficiency increased by 17.8% and 4.26%, whilst the shaft power and the pressure pulsation coefficient reduced by 1.22% and 11%, respectively. Experiments conducted on the optimized pump were consistent with the CFD model. Six different rotational speed conditions in the optimal operating points were numerically calculated in order to explore the internal hydraulic characteristics of the optimized axial flow pump. It is verified that the comprehensive frequency analysis method based on the orthogonal test approach is effective for the multiobjective optimization of the axial flow pump.

scholarly journals Corrigendum to “Multiobjective Optimization Design and Experimental Investigation on the Axial Flow Pump with Orthogonal Test Approach”

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-2
Author(s):  
Yuquan Zhang ◽  
Yanhe Xu ◽  
Yuan Zheng ◽  
E. Fernandez-Rodriguez ◽  
Aoran Sun ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Multiobjective Optimization ◽  
Optimization Design ◽  
Axial Flow ◽  
Orthogonal Test ◽  
Axial Flow Pump ◽  
Flow Pump

scholarly journals Optimization Design of a Double-Channel Pump by Means of Orthogonal Test, CFD, and Experimental Analysis

2014 ◽  
Vol 6 ◽  
pp. 545216 ◽  
Author(s):  
Binjuan Zhao ◽  
Douhua Hou ◽  
Huilong Chen ◽  
Yu Wang ◽  
Jing Qiu
Keyword(s):  
Experimental Analysis ◽  
Optimization Design ◽  
Stokes Equations ◽  
Design Method ◽  
Reference Value ◽  
Orthogonal Test ◽  
Optimized Design ◽  
Range Analysis ◽  
Design Scheme ◽  
Double Channel

A new approach to optimizing a double-channel pump was presented, based on combined use of orthogonal test, computational fluid dynamics (CFD), and experimental analysis. First, a preliminary pump was designed according to design specifications, implementing the traditional design method. Later, a standard L9 (34) orthogonal table including 9 representative design schemes was implemented to find the best parameter combination for the impeller of the pump. Reynolds averaged Navier-Stokes equations accompanied by Smith modified k-ε turbulence model were solved to obtain the inner flow fields of the pump as well as its hydraulic performance for each design scheme. The optimized design scheme was obtained after range analysis. Finally, CFD analyses and experiments were carried out to evaluate the optimized design. The results show that the characteristics of the optimized pump were obviously improved, and the simulated pump head and efficiency increased by 3.622% and 9.379%, respectively. This research not only provides an effective way to improve the hydraulic design of double-channel pumps, but also has certain reference value in multiobjectiveoptimization design of other pumps.

Improve of Unsteady Pressure Pulsation Based On Jet-Wake Suppression for a Low Specific Centrifugal Pump

2021 ◽  
Author(s):  
Chengshuo Wu ◽  
Qianqian Li ◽  
Feng Zheng ◽  
Peng Wu ◽  
Shuai Yang ◽  
...  
Keyword(s):  
Centrifugal Pump ◽  
Pressure Pulsation ◽  
Dynamic Performance ◽  
Internal Flow ◽  
Work Capacity ◽  
Wake Flow ◽  
Entropy Generation Rate ◽  
Wake Structure ◽  
Unsteady Pressure ◽  
Impeller Outlet

Abstract In this study, three impellers with different blade pressure side (PS) profiles were designed and the influence on the hydraulic and dynamic performance of a low specific speed centrifugal pump was investigated by numerical simulation and experimental research. The result shows that blade PS modification introduced in this study can efficiently alleviate the unsteady pressure pulsation of pump. In order to study the effects of blade modification on the internal flow filed, the volute domain was replaced by an even outlet region for CFD analysis. Relative velocity distribution was extracted to visualize the three-dimensional (3-D) flow characteristics at the impeller outlet. The result shows that the flow at impeller outlet presents a typical jet-wake structure which is significantly suppressed after the blade modification. The suppression of jet-wake structure, which is attributed to the redistribution of pressure and velocity in the impeller caused by the change of blade work capacity can directly reduce the intensity of pressure pulsation in the volute by increasing the velocity uniformity at impeller outlet. Given that the existence of jet-wake flow results in large mixing loss and velocity deviation at the impeller outlet, entropy generation rate and slip velocity calculation were introduced here to measure the extent of jet-wake configuration. Result shows that both indicators introduced here can be used to quantify the extent of the wake-jet structure at impeller outlet, and thus, indirectly predict the strength of unsteady pressure pulsation in pump volute.

scholarly journals Multiparameter and Multiobjective Optimization Design Based on Orthogonal Method for Mixed Flow Fan

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2819 ◽  
Author(s):  
Honggang Fan ◽  
Jinsong Zhang ◽  
Wei Zhang ◽  
Bing Liu
Keyword(s):  
Multiobjective Optimization ◽  
Optimization Design ◽  
Pressure Rise ◽  
Internal Flow ◽  
Energy Performance ◽  
Tip Leakage Flow ◽  
Tip Leakage ◽  
Outlet Angle ◽  
Impeller Outlet ◽  
Wrap Angle

Optimization design of an impeller is critical for the energy performance of a fan. This paper takes the promotion of fan efficiency and pressure rise as the optimization objectives to carry out multiparameter and multiobjective optimization research. Firstly, an experimental test bench is built to measure the energy performance of the original fan and verify the accuracy of the numerical method. Then, the hub outlet angle of impeller β1, the impeller outlet angle increment Δβ1, the wrap angle φ, the hub outlet angle of diffuser β2, and the diffuser outlet angle increment Δβ2 are set as the optimal parameters to conduct orthogonal optimal design. The results show that the efficiency of the optimal fan increases by 11.71%, and the pressure rise increases by 50.15%. The pressure and velocity distributions in an optimal fan are uniform, the internal flow separation is weakened, and the influence of tip leakage flow is reduced, which makes for the improvement of energy performance for the fan.

Unsteady flow characteristics and cavitation prediction in the double-suction centrifugal pump using a novel approach

2019 ◽  
Vol 234 (3) ◽  
pp. 283-299 ◽  
Author(s):  
Ji Pei ◽  
Majeed Koranteng Osman ◽  
Wenjie Wang ◽  
Jianping Yuan ◽  
Tingyun Yin ◽  
...  
Keyword(s):  
Centrifugal Pump ◽  
Optimization Design ◽  
Flow Analysis ◽  
Prediction Method ◽  
Internal Flow ◽  
Computational Time ◽  
The Novel ◽  
Centrifugal Pumps ◽  
Pump Design ◽  
Novel Approach

The recent advances in centrifugal pump design do not only require a better suction performance but also there have been attempts to reduce design time at a lower cost. The traditional trial-and-error optimization design method, however, depends on the designer's experience, which requires longer cycles. This is because the computational process of calculating the net positive suction head required (NPSHr) involves several calculation steps and this consumes a lot of computational time. An investigation was therefore carried out to test a novel NPSHr prediction method in a double-suction centrifugal pump using unsteady numerical simulations. In the new approach, a new boundary pair was introduced and an algorithm was used to estimate a good value for a static pressure value that correlates to a 3% drop in pump head to determine the critical cavitation point. Experiments were conducted to validate the hydraulic performance and the cavitation model. The NPSHr and the characteristic “sudden” head-drop were very well predicted by the novel approach in only three simulation steps. The internal flow analysis showed that for 0.6 Q d, the flow around the volute tongue was uneven at NPSH = 10.06 m, inducing flow separation and recirculation at the tongue region. Attached cavities were also observed around the suction ring in the spiral suction domain. The pressure fluctuations were analyzed also and the dominant frequency at the pump outlet and tongue region was the blade passing frequency. Consequently, the novel approach proved very robust and efficient in NPSHr prediction and would be a good alternative to shorten simulation time during cavitation optimization design process in centrifugal pumps.

Effects of Splitter Blades on the Unsteady Flow of a Centrifugal Pump

2012 ◽  
Author(s):  
Liting Ye ◽  
Shouqi Yuan ◽  
Jinfeng Zhang ◽  
Ye Yuan
Keyword(s):  
Flow Field ◽  
Unsteady Flow ◽  
Numerical Simulations ◽  
Centrifugal Pump ◽  
Pressure Fluctuations ◽  
Internal Flow ◽  
Suction Side ◽  
Boundary Function ◽  
Wake Flow ◽  
Design Parameters

Numerical simulations and performance tests were conducted to analyze the effects of splitter blades on the performance and whole unsteady flow field of a centrifugal pump. The studied pump is a single stage pump with a shrouded impeller (diameter = 160mm, 4 blades, specific speed = 47). Based on the original impeller, we designed 5 impellers with different splitter blades parameters. All the numerical simulations were carried out by using the commercial software ANSYS CFX 12.1 based on standard k-ε turbulence model and standard boundary function. The results showed that, the head of the impellers with splitter blades was approximately 2%∼12% higher than that without splitter blades. When adding splitter blades, the pressure fluctuations at the impeller inlet, volute outlet and the interface of impeller and volute are reduced, this can improve the “jet-wake” flow structure. Different design parameters of splitter blades have a certain effect on the pressure fluctuations at the interface of impeller and volute. When the splitter blades deviated 5° to the suction side of the long blade and the splitter blade inlet diameter is 106 mm, the head is highest and the pressure fluctuations are lowest. The work will provide a basis for the further study on the internal flow field, reducing vibration and noise of a centrifugal pump.

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