Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Cavitation Mode Analysis of Pump Inducer

  • Lee, Seungbae (School of Mechanical Engineering, Inha University) ;
  • Jung, Keun-Hwa (School of Mechanical Engineering, Inha University) ;
  • Kim, Jin-Hwa (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kang, Shin-Hyoung (School of Mechanical and Aerospace Engineering, Seoul National University)
  • Published : 2002.11.01
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Abstract

The onset of cavitation causes head and efficiency of a main pump to be reduced significantly and generates vibration and noise. In order to avoid these phenomena, the inlet of the pump is fitted with a special rotor called an inducer, which can operate satisfactorily with extensive cavitation. The motivation of this study is to find out cavitation modes from the inducer inlet pressure signals and event characteristics from outlet ones at various operating conditions. The cavitation modes are analyzed by using a cross-spectral density of fluctuating pressures at the inducer inlet. The time-frequency characteristics of wall pressures downstream of the inducer are presented in terms of event frequency, its duration time, and number of events by using the Choi-Williams distribution.

Keywords

References

  1. Acosta, A.J., 1955, A Note on Partial Cavi-tation of Flat Plate Hydrofolis, Caltech Hydro Lab. Report No. E-19.9
  2. Acosta, A.J., Tsujimoto, Y., Yoshida, Y., Azuma, S. and Cooper, P., 2000, 'Effects of Leading Edge Sweep of the Cavitating Characteristics of Inducer Pumps,' ISROMAC-8
  3. Crane, M.H., Bent, P.H. and Quinlan, D.A., 1995, 'Rotating Instability Waves as a Noise Source in a Ducted Axial Fan,' Proceedings of the ASME Noise Control and Acoustics Division, pp. 25-26
  4. Horiguchi, H., Watanabe, S., Tsujimoto, Y. and Aoki, M., 2000, 'A Theoretical Analysis of Alternate Blade Cavitation in inducers,' ASME J. Fluids Eng., Vol. 122, No. 1, pp. 156-163 https://doi.org/10.1115/1.483238
  5. Kubota, A., Kato, H., Yamaguchi, H. and Maeda, M., 1989, 'Unsteady Structure Measurement of Cloud Cavitation on a Foil Section Using Conditional Sampling Technique,' Trans. ASME I : J. of Fluid Eng., Vol. 111, pp. 204-210 https://doi.org/10.1115/1.3243624
  6. Lee, S.K. and White, P.R., 1998, 'The Enhanced of Impulsive Noise and Vibration Signals for Fault Detection in Rotating and Reciprocating Machinery,' J. of Sound and Vib., Vol. 217(3), pp. 485-505 https://doi.org/10.1006/jsvi.1998.1767
  7. Yoshida, Y., Tsujimoto, Y., Kataoka, D., Horiguchi, H. and Wahl, F., 2001, 'Effects of Alternate Leading Edge Cutback on Unsteady Cavitation in 4-bladed inducers,' ASME J. Fluids Eng., Vol. 123, No. 4, pp. 762-770 https://doi.org/10.1115/1.1411969