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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

Rosenmann, W., 1965, “Experimental Investigation of Hydrodynamically Induced Shaft Forces with a Three-Bladed Inducer,” Proceedings of the Symposium on Cavitation in Fluid Machinery, ASME Winter Annual Meeting, pp. 172–195.
Kamijo,  K., Yoshida,  M., and Tsujimoto,  Y., 1993, “Hydraulic and Mechanical Performance of LE-7 LOX Pump Inducer,” AIAA Journal of Propulsion and Power, 9, No. 6, pp. 819–826.
de Bernaldi, J., Joussellin, F., and Von Kaenel, A., 1993, “Experimental Analysis of Instabilities related to Cavitation in a Turbopump Inducer,” The First International Symposium on Pump Noise and Vibrations, Clamart, France, pp. 1–9.
Bordelon, W. J., Gaddis, S. W., and Nesman, T. E., 1995, “Cavitation Environment of the Alternate High Pressure Oxygen Turbopump Inducer,” ASME FED-Vol. 210, pp. 39–46.
Kamijo, K., Shimura, T., and Watanabe, M., 1977, “An Experimental Investigation of Cavitating Inducer Instability,” ASME Paper 77-WA/FW-14.
Tsujimoto,  Y., Kamijo,  K., and Yoshida,  Y., 1993, “A Theoretical Analysis of Rotating Cavitation in Inducers,” ASME J. Fluids Eng., 115, No. 1, pp. 135–141.
Goirand, B., Mertz, A-L., Joussellin, F., and Rebattet, C., 1992, “Experimental Investigations of Radial Loads Induced by Partial Cavitation with Liquid Hydrogen Inducer,” IMechE, C453/056, pp. 263–269.
Huang,  J. D., Aoki,  M., and Zhang,  J. T., 1998, “Alternate Blade Cavitation on Inducer,” JSME International Journal, Series B, 41, No. 1, pp. 1–6.
Acosta, A. J., 1958, “An Experimental Study of Cavitating Inducer,” Proceedings of the Second Symposium on Naval Hydrodynamics, ONR/ACR-38, pp. 537–557.
Iura, T., discussion in reference 9.
Horiguchi,  H., Watanabe,  S., Tsujimoto,  Y., and Aoki,  M., 2000, “A Theoretical Analysis of Alternate Blade Cavitation in Inducers,” ASME J. Fluids Eng., 122, No. 1, pp. 156–163.
Tsujimoto,  Y., Yoshida,  Y., Maekawa,  Y., Watanabe,  S., and Hashimoto,  T., 1997, “Observations of Oscillating Cavitations of an Inducer,” ASME J. Fluids Eng., 119, No. 4, pp. 775–781.
Watanabe,  S., Sato,  K., Tsujimoto,  Y., and Kamijo,  K., 1999, “Analysis of Rotating Cavitation in a Finite Pitch Cascade Using Closed Cavity Model and a Singularity Method,” ASME J. Fluids Eng., 121, No. 4, pp. 834–840.
Acosta, A. J., 1955, “A note on Partial Cavitation of Flat Plate Hydrofoils,” Caltech Hydro Lab. Report No. E-19.9.
Horiguchi,  H., Watanabe,  S., and Tsujimoto,  Y., 2000, “Theoretical Analysis of Cavitation in Inducers With Unequal Blades With Alternate Leading Edge Cutback, Parts I and II,” ASME J. Fluids Eng., 122, No. 2, pp. 412–418, 419–424.

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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