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Research Papers: Multiphase Flows

Suppression of Cavitation Instabilities in an Inducer by J Groove

[+] Author and Article Information
Noriyuki Shimiya, Yoshinobu Tsujimoto

Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan

Akira Fujii

 Fluent Asia Pacific Co. Ltd., 6-10-1 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan

Hironori Horiguchi1

Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japanhoriguti@me.es.osaka-u.ac.jp

Masaharu Uchiumi

 Kakuda Space Propulsion Center, JAXA, 1 Takakuzo, Jinjiro, Kakuda, Miyagi 981-1526, Japan

Junichi Kurokawa

Division of Systems Research, Faculty of Engineering, Yokohama National University, 79-1 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan

1

Corresponding author.

J. Fluids Eng 130(2), 021302 (Jan 25, 2008) (7 pages) doi:10.1115/1.2829582 History: Received November 06, 2006; Revised August 24, 2007; Published January 25, 2008

The suppression of cavitation instabilities was attempted through the control of tip leakage vortex cavitation. The control was made by using shallow grooves, called J groove, on the casing wall. With J grooves, the onset regions of the rotating cavitation and the asymmetric cavitation could be diminished. However, a cavitation surge appeared at higher cavitation numbers. From the observation of cavitation, it was found that the cavitation surge occurred when the tip leakage vortex cavitation started to interact with the leading edge of the next blade. This type of cavitation surge could be avoided by extending the leading edge of the J groove upstream. However, in this case, another type of cavitation surge occurred at much lower cavitation numbers, which was caused by the cavitation between the blade surface and the tip leakage vortex cavitation. These results highlight the importance of the tip leakage vortex cavitation for cavitation instabilities.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 7

Cross section of JG2(40,20)

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Figure 8

The occurrence regions of cavitation instabilities on the suction performance curves at various flow coefficients in the case with JG2(40,20). The rotational speed is 3000rpm.

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Figure 9

Tip cavitation in the inducer for ϕ=0.060 and σ=0.180. (a) JG1(20,20). (b) JG2(40,20).

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Figure 6

Tip cavitation in the inducer without and with JG1(20,20). ϕ=0.078, σ=0.120, 3000rpm. (a) Without a J groove. (b) With JG1(20,20).

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Figure 5

Velocity distributions at the inlet of the inducer (z∕D=−0.294) in noncavitating condition. ϕ=0.078, 2000rpm. (a) Axial velocity. (b) Tangential velocity.

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Figure 4

The occurrence regions of cavitation instabilities on the suction performance curves at various flow coefficients. The rotational speed is 3000rpm. (a) Without a J groove. (b) With JG1(20,20).

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Figure 3

Cross section of the inducer and J groove

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Figure 2

Sketch of test inducer

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Figure 1

Test facility: (a) top view and (b) side view

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Figure 10

Tip cavitation under the CS with JG2(40,20) for ϕ=0.088 and σ=0.065. (a) With a longer cavity. (b) With a shorter cavity.

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Figure 11

Spectra of inlet pressure fluctuation in the case with JG2(40,20) for ϕ=0.088 and 3000rpm

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Figure 12

Tip cavitation in the inducer in the case with JG2(40,20) for ϕ=0.078 and σ=0.050

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Figure 13

Tip cavitation under the CS in the case with JG2(40,20) for ϕ=0.078 and σ=0.030 (a) With a heavier cavity. (b) With a lighter cavity.

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Figure 14

Spectra of inlet pressure fluctuation in the case with JG2(40,20) for ϕ=0.078 and 3000rpm

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Figure 15

Cross section of JG3(40,10)

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Figure 16

The occurrence regions of cavitation instabilities on the suction performance curves at various flow coefficients in the case with JG3(40,10). The rotational speed is 3000rpm.

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Figure 17

Tip cavitation in the inducer for ϕ=0.060 and σ=0.150. (a) JG2(40,20). (b) JG3(40,10).

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Figure 18

Tip cavitation in the inducer in the case with JG3(40,10) for ϕ=0.078 and σ=0.050

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