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Research Papers: Flows in Complex Systems

Continuous Spectrum of the Rotordynamic Forces on a Four Bladed Inducer

[+] Author and Article Information
Angelo Pasini

Alta S.p.A., Via Gherardesca 5 – 56121, Pisa, Italya.pasini@alta-space.com

Lucio Torre

Alta S.p.A., Via Gherardesca 5 – 56121, Pisa, Italyl.torre@alta-space.com

Angelo Cervone

Alta S.p.A., Via Gherardesca 5 – 56121, Pisa, Italya.cervone@alta-space.com

Luca d’Agostino

 University of Pisa, Via G. Caruso 8 - 56122, Pisa, Italyluca.dagostino@ing.unipi.it

J. Fluids Eng 133(12), 121101 (Dec 19, 2011) (10 pages) doi:10.1115/1.4005258 History: Received August 24, 2011; Revised October 06, 2011; Published December 19, 2011; Online December 19, 2011

The paper illustrates the results of an experimental campaign conducted in the Cavitating Pump Rotordynamic Test Facility at ALTA S.p.A., aimed at characterizing the rotordynamic forces acting on a whirling four-bladed, tapered-hub, variable-pitch inducer, designated as DAPAMITO4. The roles of the imposed whirl motion of the rotor, flow coefficient, cavitation number and liquid temperature have been investigated. A novel experimental technique, consisting in measuring the continuous spectra of the forces as functions of the whirl ratio, has been developed and validated. This technique gives the possibility of extracting valuable information from the experiments by clearly identifying the qualitative and quantitative behavior of the forces, and is therefore useful to catch the unlikely foreseeable complexity of the rotordynamic forces and their consequences on the stability of axial inducers.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

The cavitating pump rotordynamic test facility

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Figure 2

Rendering of the test chamber assembly in the rotordynamic configuration (CPRTF) used for the test campaign reported in present paper

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Figure 3

The DAPAMITO4 Inducer

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Figure 4

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

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Figure 7

Effect of the flow coefficient on the normal and tangential components of the rotordynamic force (non-cavitating regime)

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Figure 8

Effect of the flow coefficient on the intensity and phase of the rotordynamic force (non-cavitating regime)

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Figure 9

Effect of the fluid temperature on the normal and tangential components of the rotordynamic force (non-cavitating regime)

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Figure 10

Effect of the fluid temperature on the intensity and phase of the rotordynamic force (non-cavitation regime)

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Figure 11

Effect of the cavitation number on the normal and tangential components of the rotordynamic force (cold tests at Φ = 0.044)

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Figure 12

Effect of the cavitation number on the intensity and phase of the rotordynamic force (cold test at Φ = 0.044)

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Figure 13

Effect of the cavitation number on the normal and tangential components of the rotordynamic force (cold tests at Φ = 0.029)

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Figure 14

Effect of the cavitation number on the intensity and phase of the rotordynamic force (cold test at Φ = 0.029)

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Figure 15

Effect of the cavitation number on the normal and tangential components of the rotordynamic force (hot tests at Φ = 0.044)

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Figure 16

Effect of the cavitation number on the intensity and phase of the rotordynamic force (hot tests at Φ = 0.044)

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Figure 17

Effect of the fluid temperature on the normal and tangential components of the rotordynamic force (cavitating regime)

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Figure 18

Effect of the fluid temperature on the intensity and phase of the rotordynamic force (cavitating regime)

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Figure 6

Decompostion of the rotordynamic force in its components normal and tangential to the whirl orbit. Colored areas refer to the different stability regions for positive and negative whirl ratios.

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