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Research Papers: Flows in Complex Systems

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,
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

Dario Valentini

Chemical Propulsion, SITAEL S.p.A,
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

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

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 141(4), 041103 (Nov 13, 2018) (11 pages) Paper No: FE-18-1094; doi: 10.1115/1.4041728 History: Received February 09, 2018; Revised June 26, 2018

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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References

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Figures

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Fig. 1

The cavitating pump rotordynamic test facility

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Fig. 2

Test section of the cavitating pump rotordynamic test facility at SITAEL S.p.A

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Fig. 3

The RAPDUD inducer equipped with pressure taps along the blade channels

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Fig. 4

Pressure taps position in the blade channels

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Fig. 10

Local cavitation number measured through the pressure taps located along the channels during the test at 110% ΦD

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Fig. 9

Local cavitation number measured through the pressure taps located along the channels during the test at 105% ΦD

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Fig. 8

Local cavitation number measured through the pressure taps located along the channels during the test at 100% ΦD

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Fig. 7

Local cavitation number measured through the pressure taps located along the channels during the test at 90% ΦD

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Fig. 6

Head coefficient across the blade channel as a function of cavitation number and flow coefficient

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Fig. 5

Cavitating performance of the RAPDUD inducer in cold water from 80% to 120% of the design flow coefficient

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Fig. 11

Spectrum of the amplitude of the harmonic pressure oscillations (|p̂|) measured by the pressure transducers located in the stationary frame at the inlet section during the test at 90% ΦD (measured in Pa)

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Fig. 12

Phases of the cross-spectra of the pressure transducers located in the stationary frame at the inlet section during the test at 90% ΦD (measured in degrees)

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Fig. 13

Spectrum of the amplitude of the harmonic pressure oscillations (|p̂|) measured by the pressure transducers located in the rotating frame along the blade channels during the test at 90% ΦD (measured in Pa)

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Fig. 14

Phases of the cross-spectra of the pressure transducers located in the rotating frame along the blade channels during the test at 90% ΦD (measured in degrees)

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Fig. 15

Estimated spectrum of the amplitude of the harmonic oscillations of the mean flow coefficient (|ϕ̂|) during the test at 90% ΦD

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Fig. 16

Estimated spectrum of the amplitude of the harmonic oscillations of the mean flow coefficient (|ϕ̂|) during the test at 100% ΦD

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Fig. 17

Estimated spectrum of the amplitude of the harmonic oscillations of the mean flow coefficient (|ϕ̂|) during the test at 105% ΦD

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Fig. 18

Estimated spectrum of the amplitude of the harmonic oscillations of the mean flow coefficient (|ϕ̂|) during the test at 110% ΦD

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Fig. 19

Amplitude of the harmonic oscillations of the flow coefficient associated with the cavitating volume (|Φ̂VC|) at different void fractions as a function of the oscillation frequency

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