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operating conditions and the water quality. However, due to the very good stability and repeatability of the CEIMM tunnel, it was possible to directly relate the nuclei distribution with the cavitation inception characteristics, and to transpose the results to an accurate unique “zero tension” bucket, that defines the own propeller behavior under the actual test configuration. This result is very important, but further studies will be conducted in order to confirm it and to examine its influence on the full-scale characteristic bucket.

Several vain attempts have been made for many years to try to compare similar tests carried out in different facilities, but this new approach looks promising.

ACKNOWLEDGEMENTS

The authors wish to acknowledge first the Italian Navy and the French Navy, who agreed in working together on this subject.

The authors wish to acknowledge all the colleagues from the CEIMM, and specially the staff of the cavitation tunnel, for their enthusiastic participation during the tests campaigns.

This work is supported financially by the Italian Navy and the DRET, that the authors wish to acknowledge more particularly.

REFERENCES

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2. Gindroz, B., Billet, M.L., “Nuclei and Acoustic Cavitation Inception of Ship Propellers”, Proceedings of the Second International Symposium on Cavitation, April 1994, Tokyo, Japan.

3. Gindroz, B., Billet, M.L., “Nuclei and Propellers Cavitation Inception”, Proceedings of the ASME FED Symposium on Cavitation, June 1994, Lake Tahoe, USA.

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5. Van der Meulen, J.H.J., “A Holographic Study of Cavitation on Axisymmetric Bodies and the Influence of Polymer Additives”, Publication No509, 1976, Netherlands Ship Model Basin, Wageningen , The Netherlands.

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8. Katz, J., “Cavitation Inception in Separated Flows”, California Institute of Technology, 1981, Report No Eng. 183–5.

9. Rood, E.P., “Review-Mechanisms of Cavitation Inception”, Journal of Fluid Engineering, June 1991, vol. 113.

10. Billet, M.L., “Cavitation Nuclei Measurements-A Review”, Proceedings of the Cavitation and Multiphase Flow Forum, 1985, ASME.

11. Gindroz, B., “Lois de similitude dans les essais de cavitation des turbines Francis ”, PhD. dissertation, 1991, Lausanne, Ecole Polytechnique Fédérale.

12. Henry, P., “Influence of the Amount of Bubble Nuclei on Cavitation Tests of a Francis Turbine”, Proceedings of the ASME Symposium, Cavitation and Polyphase Flow Forum , 12–14 June, 1978, Fort Collins, pp. 23–28.

13. Avellan, F., Gindroz, B., Henry, P., Bachmann, P., Vullioud, G., Wegner, M., “Influence de la chute d'essai et de la nucléation sur les performances en cavitation des modèles de turbines Francis”, Proceedings of the 13th I.A.H.R. Symp. on Progress in Technology, September 1986, Montréal, vol. 1, pp. 2–1, 2–15.

14. Billet, M.L., “The Importance and Measurement of Cavitation Nuclei”, Advancements in Aerodynamics, Fluid Mechanics and Hydraulics, 1986, Minneapolis.

15. Billet, M.L., “Cavitation Nuclei Measurements”, Proceedings of the International Symposium on Cavitation Inception, ASME WAM, 1984, New Orleans.

16. Kuiper, G., “Some Experiments With Distinguished Types of Cavitation on Ship Propellers ”, Proceedings of the International Symposium on Cavitation Inception, ASME WAM, 1979, New York.



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