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Research Papers: Multiphase Flows

Influences of the Operating Conditions on the Rotordynamic Forces Acting on a Three-Bladed Inducer Under Forced Whirl Motion

[+] Author and Article Information
Dario Valentini

Civil and Industrial Engineering Department,
University of Pisa,
2 Largo L.Lazzarino,
Pisa 56121, Italy
e-mail: dariovalentini83@gmail.com

Giovanni Pace

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

Lucio Torre

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

Angelo Pasini

Alta S.p.A.,
5 Via Gherardesca, Ospedaletto,
Pisa 56121, Italy
e-mail: a.pasini@alta-space.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 28, 2014; final manuscript received December 30, 2014; published online March 26, 2015. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 137(7), 071304 (Jul 01, 2015) (10 pages) Paper No: FE-14-1160; doi: 10.1115/1.4029887 History: Received March 28, 2014; Revised December 30, 2014; Online March 26, 2015

In the present paper, the results from an extensive experimental characterization of the rotordynamic forces acting on a whirling three-bladed, tapered-hub, variable-pitch inducer are presented. The campaign has been conducted in the Cavitating Pump Rotordynamic Test Facility (CPRTF) at ALTA S.p.A. The forces acting on the impeller have been measured by means of a rotating dynamometer mounted just behind the inducer. The roles of the rotor whirl motion, flow rate, cavitating condition, and liquid temperature have been investigated. The analysis has been conducted by means of the classical rotordynamic approach together with a recent experimental technique, consisting in measuring the rotordynamic forces continuous behavior (spectra) as functions of the whirl excitation frequency. This technique allows for evaluating information from experiments more rapidly and accurately with regards to previous methods. Therefore, it is useful to better capture the complexity of the rotordynamic forces and assess their consequences on the stability of axial inducers.

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References

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Figures

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Fig. 2

Rendering of the test chamber assembly

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Fig. 3

The DAPROT3 inducer

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Fig. 4

Schematic representation of the rotordynamic forces in the laboratory and rotating reference frames

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Fig. 5

Noncavitating pumping performance and hydraulic efficiency curves of the DAPROT3 inducer with zero imposed eccentricity and whirl motion

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Fig. 6

Stability regions of the normal and tangential components of the rotordynamic force for positive (left) and negative (right) whirl ratios

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Fig. 7

Effect of the flow coefficient on the normal and tangential components of the rotordynamic force (cold test at σN = 1.015)

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Fig. 8

Effect of the flow coefficient on the intensity and phase of the rotordynamic force (cold test at σN = 1.015)

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Fig. 9

Effect of the cavitation number on the normal and tangential components of the rotordynamic force (cold test at Φ = 0.052)

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Fig. 10

Effect of the cavitation number on the intensity and phase of the rotordynamic force (cold test at Φ = 0.052)

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Fig. 11

Effect of the cavitation number on the normal and tangential components of the rotordynamic force (cold test at Φ = 0.065)

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Fig. 12

Effect of the cavitation number on the intensity and phase of the rotordynamic force (cold test at Φ = 0.065)

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Fig. 13

Effect of the cavitation number on the normal and tangential components of the rotordynamic force (cold test at Φ = 0.078)

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Fig. 14

Effect of the cavitation number on the intensity and phase of the rotordynamic force (cold test at Φ = 0.078)

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Fig. 15

Effect of the fluid temperature on the normal and tangential components of the rotordynamic force (design flow coefficient and slightly cavitating)

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Fig. 16

Effect of the fluid temperature on the intensity and phase of the rotordynamic force (design flow coefficient and slightly cavitating)

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