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Research Papers: Flows in Complex Systems

Experimental Investigation on Unsteady Pressure Pulsation in a Centrifugal Pump With Special Slope Volute

[+] Author and Article Information
Ning Zhang

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: zhangningwlg@163.com

MinGuan Yang

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: mgyang@ujs.edu.cn

Bo Gao

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: gaobo@ujs.edu.cn

Zhong Li

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: lizhong@ujs.edu.cn

Dan Ni

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: nxm0424@163.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 5, 2014; final manuscript received January 11, 2015; published online March 11, 2015. Assoc. Editor: Bart van Esch.

J. Fluids Eng 137(6), 061103 (Jun 01, 2015) (10 pages) Paper No: FE-14-1426; doi: 10.1115/1.4029574 History: Received August 05, 2014; Revised January 11, 2015; Online March 11, 2015

Rotor–stator interaction, a major source of high amplitude pressure pulsation and flow-induced vibration in the centrifugal pump, is detrimental to stable operation of pumps. In the present study, a slope volute is investigated to explore an effective method to reduce high pressure pulsation level, and its influence on flow structures is analyzed using numerical simulation. The stress is placed on experimental investigation of unsteady pressure pulsation inside the slope volute pump. For that purpose, pressure pulsations are extracted at nine locations along the slope volute casing covering sensitive pump regions. Results show that distinct pressure pulsation peaks at fBPF, together with nonlinear components are captured. These peaks are closely related to the position of pressure transducer and operating conditions of the pump. The improvement of rotational speed of the impeller results in rapid increase of pressure fluctuation amplitude at fBPF and corresponding root mean square (RMS) value within 10–500 Hz. A comparison with conventional spiral volute pump is implemented as well, and it is demonstrated that slope volute contributes significantly to the decline of pressure pulsation level.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

Structure comparison of the slope volute and the conventional spiral volute

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Fig. 2

Configurations of cross section changing of two volutes

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Fig. 3

Comparison of cross section areas between two volutes

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Fig. 4

Closed test platform

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Fig. 5

Configuration of pressure transducers mounted on the slope volute

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Fig. 6

Performance of the model pump

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Fig. 7

Absolute velocity distributions on the sixth cross section at different flow rates inside two volutes

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Fig. 8

Comparison of flow structures of two pumps under Фd: (a) relative velocity at impeller middle section, (b) absolute velocity at the sixth cross section, and (c) absolute velocity around the volute tongue

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Fig. 9

Unsteady pressure signals of sensor p7 at four typical flow rates

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Fig. 10

Pressure spectra of pressure sensors p3 and p7 at different flow rates

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Fig. 11

RMS trends of different measuring points versus flow rate

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Fig. 12

Angle distributions of pressure amplitudes at fBPF along the slope volute casing for different flow rates

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Fig. 13

Pressure amplitudes at distinct peaks fR and 3fBPF versus flow rate

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Fig. 14

Pressure spectra of p3 at three rotational speeds under nominal flow rate

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Fig. 15

Influence of rotational speed on pressure pulsation at three different flow rates: (a) RMS value in 10–500 Hz frequency band and (b) amplitude at fBPF

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Fig. 16

Detail of pressure transducers mounting on the conventional spiral volute

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Fig. 17

Comparison of amplitudes at fBPF between two pumps at various flow rates

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Fig. 18

Comparison of RMS values between two pumps

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