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Research Papers: Fundamental Issues and Canonical Flows

Numerical Flow Prediction in Inlet Pipe of Vertical Inline Pump

[+] Author and Article Information
Christopher Stephen

National Research Center of Pumps,
Jiangsu University,
Zhenjiang 212 013, Jiangsu Province, China
e-mail: christo_spc@yahoo.com

Shouqi Yuan

National Research Center of Pumps,
Jiangsu University,
Zhenjiang 212 013, Jiangsu Province, China
e-mail: shouqiy@ujs.edu.cn

Ji Pei

National Research Center of Pumps,
Jiangsu University,
Zhenjiang 212 013, Jiangsu Province, China
e-mail: jpei@ujs.edu.cn

Xing Cheng G

National Research Center of Pumps,
Jiangsu University,
Zhenjiang 212 013, Jiangsu Province, China
e-mail: ganxingcheng@vip.qq.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 7, 2017; final manuscript received November 16, 2017; published online December 26, 2017. Assoc. Editor: Daniel Livescu.

J. Fluids Eng 140(5), 051201 (Dec 26, 2017) (10 pages) Paper No: FE-17-1414; doi: 10.1115/1.4038533 History: Received July 07, 2017; Revised November 16, 2017

For a pump, the inlet condition of flow determines the outlet conditions of fluid (i.e., energy). As a rule to minimize the losses at the entry of pump, the bends should be avoided as one of the methods. But for the case of vertical inline pump, it is unavoidable in order to save the space for installation. For the purpose of investigation in inlet pipe of vertical inline pump, the unsteady Reynolds-averaged Navier–Stokes equations are solved using the computational fluid dynamics (CFD) code. The results have been shown that there is a good agreement between the performance characteristics obtained from the simulation and experiments. The velocity coefficient from the simulation along the inlet pipe sections is well matched with the theoretical values and found to have variation near the exit of inlet pipe. The pressure and velocity coefficients studies depict the flow physics at each section along with the study of helicity at the exit of inlet pipe to determine the recirculation effects. It is observed that the vortices associated with the motion of the particles are moved toward the surfaces and are more intense than the mean flow. The trends of pressure coefficient at the exit of inlet pipe were addressed with reference to the various flow rates for eight set of radial lines. Hence, this work concludes that for inlet pipe, the generation of circulation was due to the stream path and the reverse flow from the impeller and was reconfirmed with the literature.

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Figures

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Fig. 1

3D flow domain of vertical inline pump

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Fig. 3

Computational grid: (a) isometric view of pump and (b) impeller

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Fig. 4

Monitoring locations in vertical inline pump

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Fig. 5

Performance characteristics

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Fig. 6

Velocity coefficients and area ratio along the inlet pipe at Qn

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Fig. 7

Energy gradient along inlet pipe

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Fig. 8

Contours of velocity coefficient along the inlet pipe

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Fig. 9

Contours of pressure coefficient across the various section at Qn

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Fig. 10

Circumferential distribution of wall pressure coefficient around various sections

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Fig. 11

Contours of helicity at section 7

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Fig. 12

Velocity vector at section 7

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Fig. 13

Contours of pressure coefficient at section 7

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Fig. 14

Pressure coefficient along the radial lines of section 7

Tables

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