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Research Papers: Multiphase Flows

Geometry Effects on Flow Instabilities of Different Three-Bladed Inducers

[+] Author and Article Information
Giovanni Pace

Alta S.p.A.,
5 Via Gherardesca,
Ospedaletto, Pisa 56121, Italy
e-mail: g.pace@alta-space.com

Dario Valentini

Alta S.p.A.,
5 Via Gherardesca,
Ospedaletto, Pisa 56121, Italy
e-mail: d.valentini@alta-space.com

Angelo Pasini

Alta S.p.A.,
5 Via Gherardesca,
Ospedaletto, Pisa 56121, Italy
e-mail: a.pasini@alta-space.com

Lucio Torre

Alta S.p.A.,
5 Via Gherardesca,
Ospedaletto, Pisa 56121, Italy
e-mail: l.torre@alta-space.com

Yanxia Fu

National Research Center of Pumps and
Pumping System Engineering and Technology,
Jiangsu University,
Zhenjiang 212013, China
e-mail: yanxiafu40@gmail.com

Luca d'Agostino

Professor
Civil and Industrial Engineering Department,
University of Pisa,
2 Largo L.Lazzarino,
Pisa 56121, 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 March 25, 2014; final manuscript received November 7, 2014; published online January 20, 2015. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 137(4), 041304 (Apr 01, 2015) (12 pages) Paper No: FE-14-1151; doi: 10.1115/1.4029113 History: Received March 25, 2014; Revised November 07, 2014; Online January 20, 2015

The paper presents the results of an activity carried out on a three-bladed inducer and compares the experimental data from other similar inducers. All the inducers considered in the present study have been designed by means of the simplified analytical model recently developed by some of the authors. The main effects of different geometrical solutions on hydraulic performance and flow instabilities of the pumps under noncavitating and cavitating conditions are presented in the paper.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

The CPRTF at ALTA S.p.A

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Fig. 2

A frontal view of an inducer set in the Plexiglass duct. The angular spacing between the pressure transducers is clearly shown on the right.

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Fig. 3

Schematic of the CPRTF together with the main components

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Fig. 4

The three inducers compared: DAPAMITO3 (left), DAPAMITOR3 (mid), and DAPROT3 (right)

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Fig. 5

Test section setup for all of the test inducers

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Fig. 6

Pumping performance for the three considered inducers tested at room temperature

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Fig. 7

Comparison of the experimental pumping performance (circles and stars) of inducer DAPROT3 with the model prediction (squares point)

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Fig. 8

Results of steady tests for the suction performance characterization of the DAPROT3 inducer at different values of the flow coefficient, expressed as a fraction of the design value

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Fig. 9

Results of unsteady (continuous) tests for the suction performance characterization of the DAPROT3 inducer at different values of the flow coefficient, expressed as a fraction of the design value. The points corresponding to −5% head degradation with respect to noncavitating operation are also shown.

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Fig. 10

Comparison between the steady test results (triangles) and the continuous suction performance characterization of the DAPROT3 inducer (triangles with lines) at 120% of its design flow coefficient

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Fig. 11

Photographs of cavitation in the DAPAMITO3 (top), DAPAMITOR3 (mid), and DAPROT3 (bottom) inducers at design flow coefficient

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Fig. 12

Suction performance characteristics of the DAPAMITO3, DAPAMITOR3, and DAPROT3 inducers at design flow coefficient. The head coefficients are nondimensionalized w.r.t. the corresponding noncavitating values.

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Fig. 13

Waterfall plot of the power spectral density of inlet pressure signals measured at the inlet of the DAPROT3 operating at Ф = 1.1 ФD and water temperature T = 20 °C

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Fig. 14

Amplitude of the power spectral density (top), phase of the cross-spectral density (mid), and coherence function (bottom) of the unsteady pressure signals from two transducers with 45 deg angular spacing located at the inlet of the DAPROT3 inducer operating at Φ = 1.00 ΦD, σ = 0.322, and T = 20 °C.

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Fig. 15

Phase of the cross-correlation of the unsteady pressure signals from two transducers located at the inlet of the DAPROT3 inducer as a function of their angular spacing. The inducer operates at Φ = 1.00 ΦD, σ = 0.322, and T = 20 °C, the same conditions of the data shown in Figs. 13 and 14.

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Fig. 16

Amplitude of the power spectrum density of the unsteady inlet pressure signals as a function of cavitation number for the DAPROT3 inducer operating under low-frequency surge conditions at Φ = 1.00 ΦD and T = 20 °C

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Fig. 17

Amplitude of the power spectrum density of the unsteady inlet pressure signals at the shaft rotational frequency (dot symbols) as a function of cavitation number for the DAPROT3 inducer operating at Φ = 1.00 ΦD and T = 20 °C. For better interpretation of the data, the suction performance characteristic is also plotted in the same diagram (stars symbols).

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Fig. 18

Amplitude of the power autospectra as functions of the cavitation number for the DAPROT3 and DAPAMITOR3 inducers at the shaft rotational frequency Ω (top) and blade passage frequency 3Ω (bottom) for operation at Φ = 1.00 ΦD and T = 20 °C

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