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Research Papers: Multiphase Flows

Effect of Grooves on Cavitation Around the Body of Revolution

[+] Author and Article Information
Yongjian Li

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, Chinayj-li03@mails.tsinghua.edu.cn

Haosheng Chen, Jiadao Wang

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

Darong Chen

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, Chinachendr@mail.tsinghua.edu.cn

J. Fluids Eng 132(1), 011301 (Dec 15, 2009) (7 pages) doi:10.1115/1.4000648 History: Received June 30, 2008; Revised October 28, 2009; Published December 15, 2009

Cavitation occurs widely in hydraulic machines, water and underwater vehicles, and lots of other equipments operating with liquids. Much research has been carried out to find out the factors affecting the degree of cavitation for better control of this phenomenon. In this study, the effects of grooves distributed around the body of revolution on cavitation are investigated using experimental and numerical methods. The experimental results show that the position and shape of the cavity clouds are affected by the dimensions of the grooves. A numerical simulation using the finite volume method indicates that the grooves influence the pressure distribution in the whole flow field and induce significant pressure fluctuation. The minimum pressure in each groove occurs on the top of the groove’s “windward” edge and decreases as the groove width is increased. Comparing the experimental and numerical results, it is found that cavitation is closely related to the local pressure of the fluid. Multiple grooves around the body of revolution induce pressure fluctuation. The groove width affects the amplitude and interval of the fluctuation and consequently influences the distribution of cavitation.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the water tunnel used in the State Key Laboratory of Tribology (China)

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Figure 2

Schematic of the samples: (a) the size of the sample and (b) shape of the grooves

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Figure 3

Cavity cloud around the samples with different w in the tests: (a) No. 1 w=3.0 mm, (b) No. 2 w=4.5 mm, (c) No. 3 w=7.5 mm, and (d) No. 4 w=10.5 mm

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Figure 4

Image processing for cavity cloud identification

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Figure 5

Areas of cavity region with respect to the position on the sample

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Figure 6

Simulation model: (a) schematic of the model with dimension and boundary conditions, (b) mesh of model, and (c) residuals of the numerical results

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Figure 7

Pressure distribution: (a) smooth surface, (b) surface with single groove, and (c) surface with distributed grooves

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Figure 8

Pressure distribution comparison between surface with single groove and distributed grooves

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Figure 9

Pressure distribution around the body of revolution with different groove widths

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Figure 10

Pressure distribution curves around the body of revolution with different groove widths

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Figure 11

Cp min and position of Cp min in x-direction of body of revolution with different groove widths

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Figure 12

Area of the regions where Cp<−σ of body of revolution with different groove widths

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