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Research Papers: Flows in Complex Systems

The Effect of Inlet Blade Angle Variation on Cavitation Performance of a Centrifugal Pump: A Parametric Study

[+] Author and Article Information
Aydın Hacı Dönmez

Mechanical Engineering Department,
Yildiz Technical University,
Istanbul 34349, Turkey
e-mail: adonmez@yildiz.edu.tr

Zehra Yumurtacı

Mechanical Engineering Department,
Yildiz Technical University,
Istanbul 34349, Turkey
e-mail: zyumur@yildiz.edu.tr

Levent Kavurmacıoğlu

Mechanical Engineering Department,
Istanbul Technical University,
Istanbul 34437, Turkey
e-mail: kavurmacio@itu.edu.tr

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 18, 2017; final manuscript received June 8, 2018; published online June 29, 2018. Assoc. Editor: Hui Hu.

J. Fluids Eng 141(2), 021101 (Jun 29, 2018) (10 pages) Paper No: FE-17-1671; doi: 10.1115/1.4040557 History: Received October 18, 2017; Revised June 08, 2018

The aim of the current study is to investigate the effect of inlet blade angles on cavitation performance in a centrifugal pump. In order to reveal this relationship, both hub and shroud blade angles are considered and a two-phase three-dimensional computational fluid dynamics (CFD) study is carried out. Shear stress transport (SST) turbulence and Rayleigh–Plesset cavitation models are used in simulations. Inlet blade angles for both hub and shroud are changed and pump performance (head-discharge) and cavitation (head-inlet pressure) graphs are obtained for eight different designs. Afterward, numerical cavitation tests are conducted, required net positive suction head values of the each design are calculated, and variations are demonstrated. Results show that hub and shroud blade angle variations have no significant effect on the pump characteristic curves excluding for shroud blade angle at high discharge values. However, cavitation performance of the pump is excessively affected for both hub and shroud blade angle alterations. Increasing hub blade angle has slightly negative effect on cavitation performance of the pump. On the other hand, while increasing shroud blade angle from 20 deg to 30 deg have positive effect on cavitation performance, it is negatively affected from 30 deg to 50 deg.

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Figures

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Fig. 1

Pump impeller generated by Vista CPD

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Fig. 2

Mesh generation on pump impeller (a) whole passage, (b) Tetrahedrons on single passage and hexahedrons on vaneless diffuser, and (c) boundary layer over solid surfaces

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Fig. 3

Pump characteristic curves for different hub blade angles

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Fig. 4

Pump characteristic curves for different shroud blade angles

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Fig. 5

Two-phase cavitation analysis for different hub angles (a) 20 deg, (b) 30 deg, (c) 40 deg, and (d) 50 deg

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Fig. 6

Two-phase cavitation analysis for different shroud angles (a) 20 deg, (b) 30 deg, (c) 40 deg, and (d) 50 deg

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Fig. 7

NPSHR values for varying hub and shroud blade angles

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Fig. 8

Water vapor mass fraction contours for varying hub and shroud blade angles: (a) 20 deg hub angle, (b) 20 deg shroud angle, (c) 30 deg hub angle, (d) 30 deg shroud angle, (e) 40 deg hub angle, (f) 40 deg shroud angle, (g) 50 deg hub angle, and (h) 50 deg shroud angle

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Fig. 9

Blade loading charts for varying hub and shroud blade angles: (a) 20 deg hub angle, (b) 20 deg shroud angle, (c) 30 deg hub angle, (d) 30 deg shroud angle, (e) 40 deg hub angle, (f) 40 deg shroud angle, (g) 50 deg hub angle, and (h) 50 deg shroud angle

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