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Research Papers: Flows in Complex Systems

Inducer and Centrifugal Pump Contributions to the Rotordynamic Fluid Forces Acting on a Space Turbopump

[+] Author and Article Information
Giovanni Pace

Sitael S.p.A., Via
Gherardesca 5,
Pisa 56121, Italy
e-mail: giovanni.pace@sitael.com

Dario Valentini

Sitael S.p.A.,
Via Gherardesca 5,
Pisa 56121, Italy
e-mail: dario.valentini@sitael.com

Angelo Pasini

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

Lucio Torre

GMYS-Space,
Via di Broccoletto,
Lucca 55100, Italy
e-mail: luciotrr@yahoo.it

Ruzbeh Hadavandi

Sitael S.p.A.,
Via Gherardesca 5
Pisa 56121, Italy
e-mail: rhadavandi@hotmail.com

Luca d'Agostino

Department of Industrial and Civil Engineering,
University of Pisa,
Via Gerolamo 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 July 26, 2016; final manuscript received February 25, 2017; published online October 19, 2017. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 140(2), 021104 (Oct 19, 2017) (10 pages) Paper No: FE-16-1479; doi: 10.1115/1.4037977 History: Received July 26, 2016; Revised February 25, 2017

The fluid-induced rotordynamic forces acting on a whirling space turbopump composed by an inducer and a radial impeller have been compared to the same forces measured on each single component of the turbomachine (i.e., on the inducer and on the radial impeller). The experimental campaign has been carried out in cold water at design and off-design conditions (80%, 100%, and 120% of the design flow rate) both in noncavitating (NC) and cavitating regimes. The paper illustrates the different trends of the rotordynamic forces on the axial and radial pumps and highlights their contributions on the overall turbomachine. At positive whirl ratios, the behavior of the inducer is dominant while, at negative ones, both the pumps show the same trends in such a way that the overall behavior is roughly the sum of each single component.

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Figures

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Fig. 1

Lay-out (left) and picture of the CPRTF in SITAEL S.p.A

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Fig. 2

The two-shafts mechanism and the dynamometer used in the present experimental campaign for imposing the whirling motion and the assessment of the forces acting on the pump, respectively

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Fig. 3

Cut-out drawing of the CPRTF

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Fig. 5

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

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Fig. 6

Schematic of the stability regions of the rotordynamic force for positive (left) and negative (right) whirl ratios

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Fig. 7

The cavitating performance of the three pumps at design flow conditions and T = 20 °C. The suction performance is normalized with the NC pumping performance for each pump.

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Fig. 8

Continuous and discrete tests: effect of the flow coefficient Φ on FN*, FT*, |FR*|, and ϕ at different cavitation numbers for DAPROT3

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Fig. 9

Continuous and discrete tests: effect of the flow coefficient Φ on FN*, FT*, |FR*|, and ϕ at different cavitation numbers for VAMPIRE

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Fig. 10

Continuous and discrete tests: effect of the flow coefficient Φ on FN*, FT*, |FR*|, and ϕ at different cavitation numbers for VAMPDAP

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Fig. 11

|FR*|, and ϕ together with the NC performance at ω/Ω=0.5 for DAPROT3 (top) and ω/Ω=0.4 for VAMPDAP (bottom). Circles are used to point out the rotordynamic force at the design flow coefficient, where its intensity shows a minimum for the considered whirl ratio for the two pumps (referring to Figs. 7 and 9). The considered minimum for the rotordynamic force, in the actual case, is a global minimum at varying the flow rate.

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Fig. 12

|FR*|, and ϕ together with the NC performance at ω/Ω=0. 3 for DAPROT3 and VAMPDAP. Circles are used to point out the rotordynamic force at 80% of design flow coefficient, where its intensity shows a maximum for the considered whirl ratio for the two pumps (referring to Figs. 7 and 9). The considered maximum for the rotordynamic force, in the actual case, is near the global maximum for the DAPROT3 inducer at varying the flow rate, but not for the VAMPDAP pump.

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