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research-article

Dynamics of the Blade Channel of an Inducer under Cavitation-Induced Instabilities

[+] Author and Article Information
Angelo Pasini

Department of Civil and Industrial Engineering, University of Pisa, Via Girolamo Caruso, 8 - 56122, Pisa, Italy
angelo.pasini@unipi.it

Ruzbeh Hadavandi

Chemical Propulsion, SITAEL S.p.A., via Alessandro Gherardesca, 5 - 56121, Pisa, Italy
ruzbeh.hadavandi@sitael.com

Dario Valentini

Chemical Propulsion, SITAEL S.p.A., via Alessandro Gherardesca, 5 - 56121, Pisa, Italy
dario.valentini@sitael.com

Giovanni Pace

Chemical Propulsion, SITAEL S.p.A., via Alessandro Gherardesca, 5 - 56121, Pisa, Italy
giovanni.pace@sitael.com

Luca d'Agostino

Department of Civil and Industrial Engineering, University of Pisa, Via Girolamo Caruso, 8 - 56122, Pisa, Italy
luca.dagostino@ing.unipi.it

1Corresponding author.

ASME doi:10.1115/1.4041728 History: Received February 09, 2018; Revised June 26, 2018

Abstract

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: sub-synchronous rotating cavitation, cavitation surge 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 cavitation surge mode generated by rotating cavitation in the inducer inlet.

Copyright (c) 2018 by ASME
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