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Research Papers: Flows in Complex Systems

Experimental Characterization of a Pump–Turbine in Pump Mode at Hump Instability Region

[+] Author and Article Information
J. Yang

National Research Center of Pumps,
Jiangsu University,
Xuefu Road 301,
Zhenjiang 212013, Jiangsu, China
e-mail: jyang.tcpr@gmail.com

G. Pavesi

Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: giorgio.pavesi@unipd.it

S. Yuan

National Research Center of Pumps,
Jiangsu University,
Xuefu Road 301,
Zhenjiang 212013, Jiangsu, China
e-mail: shouqiv@ujs.edu.cn

G. Cavazzini

Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: giovanna.cavazzini@unipd.it

G. Ardizzon

Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: guido.ardizzon@unipd.it

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received May 19, 2014; final manuscript received January 7, 2015; published online February 16, 2015. Assoc. Editor: Bart van Esch.

J. Fluids Eng 137(5), 051109 (May 01, 2015) (11 pages) Paper No: FE-14-1259; doi: 10.1115/1.4029572 History: Received May 19, 2014; Revised January 07, 2015; Online February 16, 2015

The unsteady phenomena of a low specific speed pump–turbine operating in pump mode were characterized by dynamic pressure measurements and high-speed flow visualization of injected air bubbles. Analyses were carried out on the pressure signals both in frequency and time–frequency domains and by bispectral protocol. The results obtained by high-speed camera were used to reveal the flow pattern in the diffuser and return vanes channels The unsteady structure identified in the return vane channel appeared both at full and part load condition. Furthermore, a rotating stall structure was found and characterized in the diffuser when the pump operated at part load. The characteristics of these two unsteady structures are described in the paper.

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References

Figures

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Fig. 1

Three-dimensional (3D) scheme of the tested configuration

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Fig. 2

Diffuser reference position (λ = 0 deg) and tested configuration (λ = 8 deg) with the distribution of monitor points

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Fig. 3

Experimental pump characteristics and saddle-type instabilities region

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Fig. 4

Mean pressure variation at the exit of the impeller and impeller static pressure increase with band of oscillation measured at impeller outlet versus the flow

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Fig. 5

Power spectrum of pressure measured by the pressure transducers D5, D6, D11, and D12 in the diffuser vane

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Fig. 6

Bispectrum of pressure measured by the pressure transducer D6 in the diffuser vane for 0.59 QDes (a) and 0.60 QDes (b)

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Fig. 7

Wavelet magnitude |Wn| of the pressure signal (transducer D6) in the diffuser vane for 0.62 QDes (a), 0.60 QDes (b), and 0.59 QDes (c)

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Fig. 8

Cross-wavelet magnitude |Wn| of the pressure signal in the diffuser vane for 0.60 QDes and 0.59 QDes

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Fig. 9

Frames obtained by high-speed camera at design flow rate in the diffuser and return channel at design flow rate

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Fig. 10

Frames obtained by high-speed camera in the diffuser at flow rates from 0.9 to 0.8Q/QDes

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Fig. 11

Sketch map of the bubbles tracks in diffuser

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Fig. 12

Frames sequence obtained by high-speed camera at 0.63 Q/QDes in the diffuser

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Fig. 13

Frames obtained by high-speed camera at 0.63 Q/QDes in the return channel

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Fig. 14

Frames sequence obtained by high-speed camera at 0.59 Q/QDes in the diffuser

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Fig. 15

Frames obtained by high-speed camera at 0.59 Q/QDes in the return channel

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Fig. 16

Frames sequence obtained by high-speed camera at 0.35 Q/QDes in the diffuser

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