Research Papers: Multiphase Flows

Rotating Corrected-Based Cavitation Model for a Centrifugal Pump

[+] Author and Article Information
Wang Jian

School of Shipping and
Mechatronic Engineering,
Taizhou University,
Taizhou 225300, China
e-mail: arieskin@126.com

Wang Yong

Research Center of Fluid Machinery
Engineering and Technology,
Jiangsu University,
Zhenjiang 212013, China
e-mail: wylq@ujs.edu.cn

Liu Houlin

Research Center of Fluid Machinery
Engineering and Technology,
Jiangsu University,
Zhenjiang 212013, China
e-mail: liuhoulin@ujs.edu.cn

Si Qiaorui

Research Center of Fluid Machinery
Engineering and Technology,
Jiangsu University,
Zhenjiang 212013, China
e-mail: siqiaorui@ujs.edu.cn

Matevž Dular

Laboratory for Water and Turbine Machines,
University of Ljubljana,
Ljubljana 1000, Slovenia
e-mail: matevz.dular@fs.uni-lj.si

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 9, 2017; final manuscript received April 17, 2018; published online May 18, 2018. Assoc. Editor: Samuel Paolucci.

J. Fluids Eng 140(11), 111301 (May 18, 2018) (8 pages) Paper No: FE-17-1649; doi: 10.1115/1.4040068 History: Received October 09, 2017; Revised April 17, 2018

Cavitation has bothered the hydraulic machinery for centuries, especially in pumps. It is essential to establish a solid way to predict the unsteady cavitation evolution with considerable accuracy. A novel cavitation model was proposed, considering the rotating motion characteristic of centrifugal pump. Comparisons were made with three other cavitation models and validated by experiments. Considerable agreements can be noticed between simulations and tests. All cavitation models employed have similar performance on predicting the pump head drop curve with proper empirical coefficients, and also the unsteady cavitation evolution was well solved. The proposed rotating corrected-based cavitation model (rotating based Zwart-Gerber-Belamri (RZGB)) obtained identical triangle cavity structure with the experiment visualizations, while the others also got triangle structure but with opposite direction. The maximum flow velocity in the impeller passage appears near the shroud, contributing to the typical triangle cavity structure. A preprocessed method for instant rotating images was carried out for evaluating the erosion risk area in centrifugal pump, based on the standard deviation of gray level. The results imply that the unsteady rear part of the attached cavity is vulnerable to be damaged, where the re-entrant flow was noticed. This work presented a suitable cavitation model and reliable numerical simulation approach for predicting cavitating flows in centrifugal pump.

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Fig. 1

Schematic diagram of the test rig: (1) upstream tank; (2) vacuum pump; (3), (4), and (10) valve; (5) turbine flowmeter; (6) water tank; (7) and (9) pressure transducer; (8) test pump; (11) downstream tank; (12) compressor; and (13) high speed

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Fig. 2

Webber number as a function of the ratio of the maximum bubble radius and blade pith in centrifugal pump

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Fig. 3

Geometry of the test pump

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Fig. 4

Comparisons between experiment and simulation results of the pump head drop

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Fig. 5

Cavitation evolution process of the experiment and simulations as σ = 0.37

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Fig. 6

Velocity projection on the streamwise direction as σ = 0.37

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Fig. 7

Absolute velocity on line A and B from blade suction side to pressure side as σ = 0.37

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Fig. 8

Frequency domain of the total pressure fluctuation as σ = 0.37

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Fig. 9

Original and processed cavitation visualization images as σ = 0.37: (a) original images and (b) processed images

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Fig. 10

Mean value and standard deviation from experiment and numerical simulation as σ = 0.37: (a) experiment and (b) numerical simulation



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