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Research Papers: Flows in Complex Systems

Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames

[+] Author and Article Information
Giovanni Pace

Chemical Propulsion, SITAEL S.p.A.,
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: giovanni.pace@sitael.com

Dario Valentini

Chemical Propulsion, SITAEL S.p.A.,
via Alessandro Gherardesca, 5,
Pisa 56121, Italy
e-mail: dario.valentini@sitael.com

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

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 March 7, 2018; final manuscript received July 9, 2018; published online November 13, 2018. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 141(4), 041104 (Nov 13, 2018) (13 pages) Paper No: FE-18-1155; doi: 10.1115/1.4041731 History: Received March 07, 2018; Revised July 09, 2018

The paper describes the results of recent experiments carried out in the Cavitating Pump Rotordynamic Test Facility for the dynamic characterization of cavitation-induced flow instabilities as simultaneously observed in the stationary and rotating frames of a high-head, three-bladed axial inducer with tapered hub and variable pitch. The flow instabilities occurring in the eye and inside the blading of the inducer have been detected, identified, and monitored by means of the spectral analysis of the pressure measurements simultaneously performed in the stationary and rotating frames by multiple transducers mounted on the casing near the inducer eye and on the inducer hub along the blade channels. An interaction between the unstable flows in the pump inlet and in the blade channels during cavitating regime has been detected. The interaction is between a low frequency axial phenomenon, which cyclically fills and empties each blade channel with cavitation, and a rotating phenomenon detected in the inducer eye.

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References

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Figures

Grahic Jump Location
Fig. 4

The RAPDUD inducer with the pressure taps on the hub

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Fig. 3

The pressure tap's position for inlet duct and blades channels names

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Fig. 2

The Cavitating Pump Rotordynamic Test Facility

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Fig. 1

Power/weight evolution of propellant feed turbopumps for U.S. space rocket engines (Adapted from a personal communication with Rockwell International).

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Fig. 5

Location of the pressure taps along the blade channels

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Fig. 9

Spectra of the pressure oscillations amplitude for Φ=ΦD and T = 20 °C measured in Pascal by the specified transducers mounted in the stationary and rotating frames

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Fig. 10

Enlargement of the spectra of pressure oscillations amplitude shown in Fig. 9

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Fig. 11

Pictures of blade channels A, B, and C at different and subsequent pump turns just after the development of RC2/A1 phenomena for Φ=ΦD and T = 20 °C

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Fig. 6

Test section configuration of the RAPDUD inducer (dimensions in mm)

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Fig. 7

Noncavitating pumping performance of the RAPDUD inducer (T = 20 °C)

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Fig. 8

Suction performance of the RAPDUD inducer at T = 20 °C, Ω = 3000 rpm for different values of the flow coefficient. On the bottom, the time versus cavitation number is shown for the test at Φ=0.070 as example for all the tested conditions.

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Fig. 12

Cross-correlation phase in degrees of the pressure transducers on the statoric (top) and rotating (bottom left) frames, together with the dimensionless suction performance (bottom right) for Φ=ΦD and T = 20 °C. The vertical lines (continuous and long-dashed) refer to the beginning and the end of the RC2 and A1 flow oscillations.

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Fig. 13

Enlargement of the cross-correlation phase depicted in Fig. 12

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Fig. 14

Cross-correlation phase in degrees of the pressure transducers on the statoric (top) and rotating (bottom left) frames, together with the dimensionless suction performance (bottom right) for Φ=0.8ΦD and T = 20 °C. The vertical lines (continuous, dashed, and long-dashed) refer to the beginning and the end of the RC2 and RC1 flow oscillations.

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Fig. 15

Spectra of the pressure oscillations amplitude for Φ=0.8ΦD and T = 20 °C measured in Pascal at the mounting stations of the indicated transducers

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Fig. 16

Cross-correlation phase in degrees of the pressure transducers on the statoric (top) and rotating (bottom left) frames, together with the dimensionless suction performance (bottom right) for Φ=1.2ΦD and T = 20 °C

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Fig. 17

Spectra of the pressure oscillations amplitude for Φ=1.2ΦD and T = 20 °C measured in Pascal at the mounting stations of the indicated transducers

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