The present paper illustrates the setup and the preliminary results of an experimental investigation of cavitation flow instabilities carried out by means of a high-speed camera on a three-bladed inducer in the cavitating pump rotordynamic test facility (CPRTF) at Alta S.p.A. The brightness thresholding technique adopted for cavitation recognition is described and implemented in a semi-automatic algorithm. In order to test the capabilities of the algorithm, the mean frontal cavitating area has been computed under different operating conditions. The tip cavity length has also been evaluated as a function of time. Inlet pressure signal and video acquisitions have been synchronized in order to analyze possible cavitation fluid-dynamic instabilities both optically and by means of pressure fluctuation analysis. Fourier analysis showed the occurrence of a cavity length oscillation at a frequency of , which corresponds to the frequency of the rotating stall instability detected by means of pressure oscillation analysis.
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July 2007
Technical Papers
Setup of a High-Speed Optical System for the Characterization of Flow Instabilities Generated by Cavitation
Cristina Bramanti,
Cristina Bramanti
Post-Doc Fellow
ESA-ESTEC
, Keplerlaan 1, Nordwijk, The Netherlands
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Lucio Torre,
Lucio Torre
Research Engineer
Alta S.p.A.,
Via Gherardesca 5
, 56121 Pisa, Italy
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Luca d’Agostino
Luca d’Agostino
Professor
Department of Aerospace Engineering,
University of Pisa
, Via G. Caruso, 56100 Pisa, Italy
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Angelo Cervone
Project Manager
Cristina Bramanti
Post-Doc Fellow
ESA-ESTEC
, Keplerlaan 1, Nordwijk, The Netherlands
Lucio Torre
Research Engineer
Alta S.p.A.,
Via Gherardesca 5
, 56121 Pisa, Italy
Domenico Fotino
MS Student
Luca d’Agostino
Professor
Department of Aerospace Engineering,
University of Pisa
, Via G. Caruso, 56100 Pisa, ItalyJ. Fluids Eng. Jul 2007, 129(7): 877-885 (9 pages)
Published Online: January 15, 2007
Article history
Received:
September 14, 2006
Revised:
January 15, 2007
Citation
Cervone, A., Bramanti, C., Torre, L., Fotino, D., and d’Agostino, L. (January 15, 2007). "Setup of a High-Speed Optical System for the Characterization of Flow Instabilities Generated by Cavitation." ASME. J. Fluids Eng. July 2007; 129(7): 877–885. https://doi.org/10.1115/1.2742738
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