A high-head three-bladed inducer has been equipped with pressure taps on the hub along the blade channels with the aim of more closely investigating the dynamics of cavitation-induced instabilities developing in the impeller flow. Spectral analysis of the pressure signals obtained from two sets of transducers mounted both in the stationary and rotating frames has allowed to characterize the nature, intensity, and interactions of the main flow instabilities detected in the experiments: subsynchronous rotating cavitation (RC), cavitation surge (CS), and a high-order axial surge oscillation. A dynamic model of the unsteady flow in the blade channels has been developed based on experimental data and on suitable descriptions of the mean flow and the oscillations of the cavitating volume. The model has been used for estimating at the inducer operating conditions of interest the intensity of the flow oscillations associated with the occurrence of the CS mode generated by RC in the inducer inlet.
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April 2019
Research-Article
Dynamics of the Blade Channel of an Inducer Under Cavitation-Induced Instabilities
Angelo Pasini,
Angelo Pasini
Department of Civil and Industrial Engineering,
University of Pisa,
Via Girolamo Caruso, 8,
Pisa 56122, Italy
e-mail: angelo.pasini@unipi.it
University of Pisa,
Via Girolamo Caruso, 8,
Pisa 56122, Italy
e-mail: angelo.pasini@unipi.it
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Ruzbeh Hadavandi,
Ruzbeh Hadavandi
Chemical Propulsion, SITAEL S.p.A,
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: ruzbeh.hadavandi@sitael.com
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: ruzbeh.hadavandi@sitael.com
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Dario Valentini,
Dario Valentini
Chemical Propulsion, SITAEL S.p.A,
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: dario.valentini@sitael.com
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: dario.valentini@sitael.com
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Giovanni Pace,
Giovanni Pace
Chemical Propulsion, SITAEL S.p.A,
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: giovanni.pace@sitael.com
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: giovanni.pace@sitael.com
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Luca d'Agostino
Luca d'Agostino
Department of Civil and Industrial Engineering,
University of Pisa,
Via Girolamo Caruso, 8,
Pisa 56122, Italy
e-mail: luca.dagostino@ing.unipi.it
University of Pisa,
Via Girolamo Caruso, 8,
Pisa 56122, Italy
e-mail: luca.dagostino@ing.unipi.it
Search for other works by this author on:
Angelo Pasini
Department of Civil and Industrial Engineering,
University of Pisa,
Via Girolamo Caruso, 8,
Pisa 56122, Italy
e-mail: angelo.pasini@unipi.it
University of Pisa,
Via Girolamo Caruso, 8,
Pisa 56122, Italy
e-mail: angelo.pasini@unipi.it
Ruzbeh Hadavandi
Chemical Propulsion, SITAEL S.p.A,
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: ruzbeh.hadavandi@sitael.com
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: ruzbeh.hadavandi@sitael.com
Dario Valentini
Chemical Propulsion, SITAEL S.p.A,
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: dario.valentini@sitael.com
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: dario.valentini@sitael.com
Giovanni Pace
Chemical Propulsion, SITAEL S.p.A,
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: giovanni.pace@sitael.com
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: giovanni.pace@sitael.com
Luca d'Agostino
Department of Civil and Industrial Engineering,
University of Pisa,
Via Girolamo Caruso, 8,
Pisa 56122, Italy
e-mail: luca.dagostino@ing.unipi.it
University of Pisa,
Via Girolamo Caruso, 8,
Pisa 56122, Italy
e-mail: luca.dagostino@ing.unipi.it
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 9, 2018; final manuscript received June 26, 2018; published online November 13, 2018. Assoc. Editor: Olivier Coutier-Delgosha.
J. Fluids Eng. Apr 2019, 141(4): 041103 (11 pages)
Published Online: November 13, 2018
Article history
Received:
February 9, 2018
Revised:
June 26, 2018
Citation
Pasini, A., Hadavandi, R., Valentini, D., Pace, G., and d'Agostino, L. (November 13, 2018). "Dynamics of the Blade Channel of an Inducer Under Cavitation-Induced Instabilities." ASME. J. Fluids Eng. April 2019; 141(4): 041103. https://doi.org/10.1115/1.4041728
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