International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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Cavitation Surge Suppression of Pump Inducer with Axi-asymmetrical Inlet Plate

  • Received : 2009.11.16
  • Accepted : 2009.12.10
  • Published : 2010.03.01
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Abstract

The attachment of inducer in front of main impeller is a powerful method to improve cavitation performance. Cavitation surge oscillation, however, often occurs at partial flow rate and extremely low suction pressure. As the cavitation surge oscillation with low frequency of about 10 Hz occurs in a close relation between the inlet backflow cavitation and the growth of blade cavity into the throat section of blade passage, one method of installing an axi-asymmetrical plate upstream of inducer has been proposed to suppress the oscillation. The inlet flow distortion due to the axi-asymmetrical plate makes different elongations of cavities on all blades, which prevent the flow from becoming simultaneously unstable at all throat sections. In the present study, changes of the suppression effects with the axial distance between the inducer inlet and the plate and the changes with the blockage ratios of plate area to the cross-sectional area of inducer inlet are investigated for helical inducers with tip blade angles of $8^{\circ}$ and $14^{\circ}$. Then a conceivable application will be proposed to suppress the cavitation surge oscillation by installing axi-asymmetrical inlet plate.

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References

  1. Takamatsu, Y., Furukawa, A. and Ishizaka, K., 1984, “Method of Estimation of Required NPSH of Centrifugal Pump with Inducer,” Proc. 1st China-Japan Joint Conference on Hydraulic Machinery and Equipment, pp. 253-261.
  2. Jacobsen, J. K., 1971, “Liquid Rocket Engine Turbo-pump Inducers,” NASA SP-8052.
  3. Watanabe, T. and Kawata, 1978, “Y., Research on the Oscillations in Cavitating Inducer,” IAHR Joint Symp. on Design and Operation of Fluid Machinery, pp. 265-274.
  4. Tsujimoto, Y., et al., 1997, “Observation of Oscillating Cavitation of an Inducer,” Trans. ASME, J. Fluids Eng., Vol. 119, pp. 775-781. https://doi.org/10.1115/1.2819497
  5. Yoshida, Y., Tsujimoto, Y., Kataoka, D., Horiguchi, H, and Wahl, F., 2001, “Effects of Leading Edge Cutback on Unsteady Cavitation in 4-Bladed Inducers,” ASME J. Fluids Eng., Vol. 123, pp. 762-770. https://doi.org/10.1115/1.1411969
  6. Kamijo, K., Yoshida, M. and Tsujimoto, Y., 1993, “Hydraulic and Mechanical Performance of LE-7 LOX Pump Inducer,” AIAA Journal of Propulsion and Power, Vol. 9, pp. 819-826. https://doi.org/10.2514/3.23695
  7. Kurokawa, J., Imamura, H., Choi, Y.-D., Ito, M. and Kikuchi, M., 2005, “Suppression of Cavitation in Inducer by J-Grooves,” (in Japanese), Turbomachinery(TSJ), 33-10, 592-600.
  8. Kim, J.-H., Ishizaka, K., et al., 2008, “Suppression Effect of Upstream Installed Ring-Shaped Obstacle Plate on Cavitation Surge in Pump Inducers,” J. of Fluids Science and Technology, JSME, Vol. 3, No. 1, pp. 1-10. https://doi.org/10.1299/jfst.3.1
  9. Furukawa, A., Ishizaka, K. and Watanabe, S., 2002, “Flow Measurement in Helical Inducer and Estimate of Fluctuating Blade Force in Cavitation Surge Phenomena,” Japan Soc. Mech. Engrs. Inter. J., Ser.B, Vol. 45, pp. 672-677. https://doi.org/10.1299/jsmeb.45.672
  10. Kim, J.-H., Atono T., Ishizaka, K., et al., 2008, “Rotating Behavior Observation of Cavitation in Inducer with Suction Axi-asymmetrical Plate,” J. of Fluids Science and Technology, JSME, Vol. 3, No. 6, pp. 744-753. https://doi.org/10.1299/jfst.3.744
  11. Ishizaka, K, and Furukawa, A., 1998, “Basic Study on Advance Detection of Cavitation Surge in Helical Inducer,” Proc. US-Japan Seminar on Abnormal Flow Phenomena in Turbomachinery, Cavitation, 1-8.

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