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TECHNICAL PAPERS

Effects of Alternate Leading Edge Cutback on Unsteady Cavitation in 4-Bladed Inducers

[+] Author and Article Information
Yoshiki Yoshida, Yoshinobu Tsujimoto

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

Dai Kataoka

Kawasaki Heavy Industries, LTD., Gas Turbine Division, Aero Engine Engineering Department, 1-1, Kawasaki, Akashi, Hyogo 673-8666, Japan

Hironori Horiguchi

Tokushima University, Mechanical Engineering, 2-1, Minamizyousanzima, Tokushima 770-8506, Japan

Fabien Wahl

SNECMA, Division SEP, Direction Grosse Propulsion A Liquides, Fore⁁t de Vernon BP802, 27208 Vernon Cedex, France

J. Fluids Eng 123(4), 762-770 (Jul 11, 2001) (9 pages) doi:10.1115/1.1411969 History: Received May 22, 2000; Revised July 11, 2001
Copyright © 2001 by ASME
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References

Figures

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Inducer cross section and inlet pressure measurement locations
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Sketch of the test inducers, Inducer 0-0 without the cutback and Inducer 0-15, 0-30, 0-50 with the alternate leading edge cutback. (a) Inducer 0-0; (b) Inducer 0-15; (c) Inducer 0-30; (d) Inducer 0-50
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Static pressure performance curves, for Inducer 0-0, 0-15, 0-30, and 0-50 with noncavitating flow (uncertainty in ψs±0.002, in ϕ±0.002)
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Spectral analyses of the inlet pressure fluctuations for ϕ=0.080 and ϕ=0.085 with Inducer 0-0 (uncertainty in f±1.5 Hz, in σ±0.002, in ϕ±0.002, in ψs±0.0005), (a) ϕ=0.080; (b) ϕ=0.085
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Changes of the tip cavity length versus shaft rotations for various cavitation numbers, ϕ=0.080 and ϕ=0.085 with Inducer 0-0 (uncertainty in l/h±0.05, in Rev.±0.05, in ϕ±0.002, in σ±0.002). (1) Inducer 0-0, ϕ=0.080. (a) Equal length cavitation, σ=0.10; (b) alternate blade cavitation, σ=0.085; (c) alternate blade cavitation, σ=0.060; (d) rotating cavitation, σ=0.050. (2) Inducer 0-0, ϕ=0.085. (e) Alternate blade cavitation, σ=0.060; (f) cavitation surge, σ=0.050
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Variation of the tip cavity length versus cavitation number, σ and σ/2α for ϕ=0.060 and ϕ=0.080 with Inducer 0-0 (uncertainty in l/h±0.05, in ϕ±0.002, in σ±0.002). (a) Cavity length versus cavitation number σ (Experiment, ϕ=0.060 and ϕ=0.080); (b) cavity length versus σ/2α (experiment, ϕ=0.060 and ϕ=0.080); (c) cavity length versus σ/2α (calculation from Horiguchi et al. 11)
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Comparison between the experimental values and calculated values (Watanabe et al. 13) for the propagation speed ratio of rotating cavitation showing the effect of number of blades (4-bladed Inducer 0-0 compared with 3-bladed inducer (Tsujimoto et al. 12)) (uncertainty in ΩR/Ω±0.02, in ϕ±0.002, in σ±0.002)
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Spectral analyses of the inlet pressure fluctuations showing the effect of alternate leading edge cutback, for ϕ=0.074 with Inducer 0-0, 0-15, 0-30, and 0-50 (uncertainty in f±1.5 Hz, in σ±0.002, in ϕ±0.002, in ψs±0.0005), (a) Inducer 0-0; (b) Inducer 0-15; (c) Inducer 0-30; (d) Inducer 0-50
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Comparison of the occurrence regions of various cavitation patterns showing the effect of alternate leading edge cutback, for ϕ=0.074 with Inducer 0-0, 0-15, 0-30, and 0-50
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Variation of the tip cavity length versus cavitation number with the asymmetric cavitation, and changes of the tip cavity length versus shaft rotation under the asymmetric cavitation (σ=0.035) with Inducer 0-30, for ϕ=0.078 (uncertainty in l/h±0.05, in ψs±0.002, in ϕ±0.002, in σ±0.002, in rev.±0.05). (a) ϕ=0.078; (b) ϕ=0.078,σ=0.035
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Photographs of two types of alternate blade cavitation: (a) longer cavities on longer blades, and (b) longer cavities on shorter blades for ϕ=0.055,σ=0.060 with Inducer 0-15 (uncertainty in ϕ±0.002. in σ±0.002). (a) Longer cavities on longer blades (σ=0.060 with increasing cavitation number); (b) longer cavities on shorter blades (σ=0.060 with decreasing cavitation number)
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Switch of the alternate blade cavitation depending if the cavitation number is decreased or increased for ϕ=0.06 with Inducer 0-15 (uncertainty in l/h±0.05, in σ±0.002, in ϕ±0.002, in ψs±0.002). (a) Cavitation number decreasing (experiment); (b) cavitation number increasing (experiment); (c) calculation (from Horiguchi et al. 15)
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Change of the tip cavity length versus shaft rotations under the surge mode oscillation (S.M.O., f=16 Hz), for ϕ=0.060,σ=0.10 with Inducer 0-15 (uncertainty in l/h±0.05, in rev.±0.05, in ϕ±0.002, in σ±0.002)
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Variation of the tip cavity length versus cavitation number in Inducer 0-50 with alternate blade cavitation (longer cavities on longer blades) for ϕ=0.060 (uncertainty in l/h±0.05, in ϕ±0.002, in σ±0.002, in ψs±0.002). (a) Cavitation number decreasing and increasing (experiment); (b) calculation (Equivalent to Inducer 0-65 from Horiguchi et al. 15)
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Cavitation performances and maps showing the occurrence regions of various cavitation patterns for Inducer 0-0, 0-15, 0-30, and 0-50 with increasing cavitation number (uncertainty in ψs±0.002, in ϕ±0.002, in σ±0.002), (a) Inducer 0-0; (b) Inducer 0-15; (c) Inducer 0-30; (d) Inducer 0-50

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