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Published June 1, 1991 | public
Journal Article Open

A Cavitation Susceptability Meter with Optical Cavitation Monitoring-Part One: Design Concepts


This work is concerned with the design of a Cavitation Susceptibility Meter based on the use of a venturi tube for the measurement of the active cavitation nuclei concentration in water samples as a function of the applied tension. The operation of the Cavitation Susceptibility Meter is analyzed and the main considerations leading to the proposed design are illustrated and critically discussed. The results of this analysis indicate that the operational range is mainly limited by nuclei interference, flow separation and saturation (choking), and suggest to develop a Cavitation Susceptibility Meter where; (1) the flow possesses a laminar potential core throughout the venturi throat section in all operational conditions; (b) the pressure at the venturi throat is determined from the upstream pressure and the local flow velocity; (c) the detection of cavitation and the measurement of the flow velocity are carried out optically by means of a Laser Doppler Velocimeter; (d) a custom-made electronic Signal Processor incorporating a frequency counter is used for real time data generation and temporary storage; (e) a computerized system performs the final acquisition and reduction of the data.

Additional Information

Contributed by the Fluids Enpineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division July 20, 1989. This research has been funded by the Office of Naval Research and by the Naval Sea Systems Command General Hydromechanics Research Program administered by the David W. Taylor Naval Ship Research and Development Center. The North Atlantic Treaty Organization-Consiglio Nazionale delle Ricerche, Italy, has also contributed to the support of this work through a 1982 and a 1983 Fellowship for Technological Research, Special thanks to Dr. T. T. Huang of DTNSRDC for his interest in this work, to Mr. Joe Fontana, Mr. Elton Daly, Mr. Rich Eastvedt, Mr. Leonard Montenegro, Mr. John Lee and to Miss Cecilia Lin of the Caltech staff for their assistance in the completion of the experiment and to Dr. Haskel Shapiro, Mr. Bob Kirkpatrick and their group for the design and implementation of the custom-made electronics.


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