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Multi-component optimization of a vertical inline pump based on multi-objective pso and artificial neural network

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Abstract

The vertical inline pump is a single-stage single-suction centrifugal pump with a curved inlet pipe before the impeller, which is widely used in where the constraint is installation space. In this paper, with the objective functions of efficiencies at 0.5Qd, 1.0Qd, and 1.5Qd, a multi-objective optimization on inlet pipe and impeller was proposed to broaden the efficient operating period of a vertical inline pump. Two 5th order Bézier curves were adopted to fit the shape of the mid curve of the inlet pipe and the trend of the blade angle of the impeller. Fourteen design variables were selected after the data-mining process. 300 sample cases were generated using Latin hypercube sampling (LHS), and they were solved by 3D RANS code to obtain the objective functions. The feed-forward artificial neural network with a hidden layer and an output layer was adopted to fit the two objective functions and the 14 design variables. The Pareto frontiers were generated for the three objectives using multi-objective particle swarm optimization (MOPSO), and three different configurations on the Pareto front are selected for detailed study by computational fluid dynamics (CFD). The results showed that the profile of the inlet pipe and the blade have a dramatic impact on the performance of the vertical inline pump. The Pareto frontiers reported that the performance under the overload condition usually keeps stable when the nominal efficiency is lower than 82 %, or the part-load efficiency is lower than 62 %, and it will decrease rapidly after that. After optimization, the improvement of efficiencies at the part-load condition and nominal condition of the picked case were 9.65 % and 7.95 %, respectively.

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Abbreviations

b 1 :

Impeller inlet width, mm

b 2 :

Impeller outlet width, mm

D 1 :

The diameter of impeller inlet, mm

D s :

The diameter of the suction pipe, mm

D d :

The diameter of the delivery pipe, mm

H :

Pump head, m

n :

Rotating speed of impeller, rpm

n s :

Specific speed of the pump

Q :

Flow rate, m3/s

Q d :

The volume flow rate of design flow condition, m3/h

u 2 :

Impeller peripheral velocity at the outlet, m/s

x i :

Horizontal coordinate of control point i, mm

y i :

Vertical coordinate of control point i, mm

z :

Number of blades

β 1 :

Impeller inlet vane angle, degree

β 2 :

Impeller outlet vane angle, degree

η :

The efficiency of the pump

ϕ :

Flow coefficient

ψ :

Head coefficient

C p :

Pressure coefficient

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Acknowledgments

This work is funded by the National Natural Science Foundation of China (Grant No. 51879121), Natural Science Foundation of Jiangsu Province (Grant No. BK20190851), China Postdoctoral Science Foundation funded project (Grant No. 2019M651736, 2019T120394), Primary Research & Development Plan of Jiangsu Province (Grant No. BE2019009-1), Open Research Subject of Key Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education (szjj2019-007).

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Correspondence to Ji Pei.

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Recommended by Guest Editor Seung Jin Song

Xingcheng Gan is currently a Ph.D. candidate in the National Research Center of Pumps, Jiangsu University. He received his MA degree from Jiangsu University in 2019. His research interests include the optimi-zation design, computational flow dynamics and analysis of unsteady flow of centrifugal pump.

Ji Pei is currently an Associate Professor in National Research Center of Pumps, Jiangsu University. He received his Ph.D. degree from Jiangsu University in 2013. His research interests include unsteady flow, flow-induced vibration, and fluid-structure interaction in turbomachinery.

Wenjie Wang is currently an Assistant Professor in the National Research Center of Pumps, Jiangsu University. He received his Ph.D. degree from Jiangsu University in 2017. His research interests include the optimization design and analysis of unsteady flow of centrifugal pump.

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Gan, X., Pei, J., Wang, W. et al. Multi-component optimization of a vertical inline pump based on multi-objective pso and artificial neural network. J Mech Sci Technol 34, 4883–4896 (2020). https://doi.org/10.1007/s12206-020-2101-4

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  • DOI: https://doi.org/10.1007/s12206-020-2101-4

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