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TECHNICAL PAPERS

A Linear Stability Analysis of Cavitation in a Finite Blade Count Impeller

[+] Author and Article Information
Hironori Horiguchi

Faculty of Engineering, Tokushima University, 2-1 Minami-josanjima, Tokushima, 770-8506 Japane-mail: horiguti@me.tokuhsima-u.ac.jp

Satoshi Watanabe

Graduate School of Engineering, Kyushu University, 6-10-1 Hakozaki, Fukuoka, 812-8581 Japane-mail: fmnabe@mech.kyushu-u.ac.jp

Yoshinobu Tsujimoto

Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531 Japane-mail: tujimoto@me.es.osaka-u.ac.jp

J. Fluids Eng 122(4), 798-805 (Jul 18, 2000) (8 pages) doi:10.1115/1.1315300 History: Received June 03, 1999; Revised July 18, 2000
Copyright © 2000 by ASME
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References

Figures

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Unstable modes of the cavitation in the cascade with ZN=4,C/h=2.0 and β=80 deg. (a) Strouhal number for equal length cavitation; (b) Strouhal number for alternate blade cavitation; (c) Phase difference for alternate blade cavitation
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Unstable modes of the cavitation in the cascade with ZN=5,C/h=2.0 and β=80 deg
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Model for present analysis
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Various types of steady cavitation, adopted from B. Goiland et al. 5. (a) Equal length cavitation; (b) alternate blade cavitation; (c) asymmetric cavitation
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Residual of cavity closure condition at σ/2α=2.4. (a) ZN=3,m=1; (b) ZN=4,m=1; (c) ZN=4,m=2; (d) ZN=5,m=2
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Steady cavity length for the cascade with ZN=2,3,4,5,C/h=2.0 and β=80 deg
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Unstable modes of the cavitation in the cascade with ZN=2,C/h=2.0 and β=80 deg. (a) Strouhal number for equal length cavitation; (b) Strouhal number for alternate blade cavitation (c) Phase difference for alternate blade cavitation
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Unstable modes of the cavitation in the cascade with ZN=3,C/h=2.0 and β=80 deg
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Unsteady cavity shapes in first and second modes with θn,n+1=0 deg at σ/2α=2.0 for α=4.0 deg. (a) Mode II; (b) Mode IX
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Destabilizing roots of rotating cavitation. (a) First mode; (b) second mode; (c) third mode

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