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TECHNICAL PAPERS

Theoretical Analysis of Cavitation in Inducers With Unequal Blades With Alternate Leading Edge Cutback: Part II—Effects of the Amount of Cutback

[+] Author and Article Information
Hironori Horiguchi

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

Satoshi Watanabe

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

Yoshinobu Tsujimoto

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

J. Fluids Eng 122(2), 419-424 (Feb 01, 2000) (6 pages) doi:10.1115/1.483272 History: Received June 07, 1999; Revised February 01, 2000
Copyright © 2000 by ASME
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Figures

Grahic Jump Location
The same as in Fig. 7, for Le/h=0.8.θ0,21,3=180 deg (a) Reduced frequency, (b) phase difference.
Grahic Jump Location
The same as in Fig. 7, for Le/h=0.6.θ0,21,3=180 deg. (a) Reduced frequency for the steady cavitation with smaller difference in cavity length, (b) phase difference for the steady cavitation with smaller difference in cavity length, (c) reduced frequency for the steady cavitation with larger difference in cavity length, (d) phase difference for the steady cavitation with larger difference in cavity length.
Grahic Jump Location
Results of stability analysis of steady cavitation for the cascade with the alternate leading edge cutting with Le/h=0.4. The original cascade is with C/h=2.0 and β=80 deg. It is assumed that θ0,21,3=180 deg and unstable modes are plotted for the steady cavitation shown by the solid lines in the upper part of each figure. (a) Reduced frequency for the steady cavitation corresponding to equal length cavitation, (b) phase difference for the steady cavitation corresponding to equal length cavitation, (c) reduced frequency for the steady cavitation corresponding to alternate blade cavitation, (d) phase difference for the steady cavitation corresponding to alternate blade cavitation.
Grahic Jump Location
The same as in Fig. 4, for Le/h=0.8.θ0,21,3=0 deg. (a) Reduced frequency, (b) phase difference.
Grahic Jump Location
The same as in Fig. 4, for Le/h=0.6.θ0,21,3=0 deg. (a) Reduced frequency for the steady cavitation with smaller difference in cavity length, (b) phase difference for the steady cavitation with smaller difference in cavity length, (c) reduced frequency for the steady cavitation with larger difference in cavity length, (d) phase difference for the steady cavitation with larger difference in cavity length.
Grahic Jump Location
Results of statical stability analysis of steady cavitation for the cascade with the alternate leading edge cutting with Le/h=0.4. The original cascade is with C/h=2.0 and β=80 deg. It is assumed that θ0,21,3=0 deg and unstable modes are plotted for the steady cavitation shown by the solid lines in the upper part of each figure. (a) Reduced frequency for the steady cavitation corresponding to equal length cavitation, (b) phase difference for the steady cavitation corresponding to equal length cavitation, (c) reduced frequency for the steady cavitation corresponding to alternate blade cavitation, (d) phase difference for the steady cavitation corresponding to alternate blade cavitation.
Grahic Jump Location
Experimental cavity length at the tip of inducer at ψs=0.165 (ϕ=0.060), with σ decreased. (a) The amount of cut-back 15 deg at the tip of inducer, corresponding to Le/h=0.159, (b) the amount of cutback 50 deg at the tip of inducer, corresponding to Le/h=0.530.
Grahic Jump Location
Steady cavity shape and velocity in a cascade with equal blades, C/h=2.0 and β=80 deg for α=4 deg. (a) Equal length cavitation (σ/2α=7.0 Is/h=0.202), (b) equal length cavitation (σ/2α=2.58, Is/h=0.640), (c) alternate blade cavitation (σ/2α=2.58, Is/h=0.249 and 0.882).
Grahic Jump Location
Steady cavity length and its stability for the cascade with C/h=2.0, β=80 deg, Le/h=0.2, 0.4, 0.6 and 0.8. (a) Le/h=0.2, (b) Le/h=0.4, (c) Le/h=0.6, (d) Le/h=0.8

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