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Research Papers: Flows in Complex Systems

Unsteady Pressure Pulsation Measurements and Analysis of a Low Specific Speed Centrifugal Pump

[+] Author and Article Information
Bo Gao

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

Pengming Guo

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: guopengming321@163.com

Ning Zhang

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

Zhong Li

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

MinGuan Yang

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

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 15, 2016; final manuscript received February 2, 2017; published online April 24, 2017. Assoc. Editor: Satoshi Watanabe.

J. Fluids Eng 139(7), 071101 (Apr 24, 2017) (9 pages) Paper No: FE-16-1454; doi: 10.1115/1.4036157 History: Received July 15, 2016; Revised February 02, 2017

Intense pressure pulsation, resulted from the flow structure shedding from the blade trailing edge and its interaction with the volute tongue and the casing, is detrimental to the stable operation of centrifugal pumps. In the present study, unsteady pressure pulsation signals at different positions of the volute casing are extracted using high response pressure transducers at flow rate of 0–1.55ΦN. Emphasis is laid upon the influence of measuring position and operating condition on pressure pulsation characteristics, and components at the blade passing frequency fBPF and root-mean-square (RMS) values in 0–20.66fn frequency band are mainly analyzed. Results clearly show that the predominant components in pressure spectra always locate at fBPF. The varying trends versus flow rate of components at fBPF differ significantly for different points, and it is considered to be associated with the corresponding flow structures at particular positions of the volute casing. At the near-tongue region, high pressure amplitudes occur at the position of θ = 36 deg, namely the point at the after tongue region. For different measuring points, angular distributions of amplitudes at fBPF and RMS values in 0–20.66fn frequency band are not consistent and affected significantly by the pump operating conditions.

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References

Figures

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Fig. 1

Configurations of cross sections of the volute and meridional view of the impeller

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Fig. 2

Closed test platform

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Fig. 3

Measuring positions of pressure transducers

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Fig. 4

Experimental performance of the model pump

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Fig. 5

Time-domain pressure signals of transducer P3 (θ = 36 deg)

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Fig. 6

Pressure spectra of four measuring positions at nominal flow rate

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Fig. 7

Pressure spectra of point θ = 36 deg at various flow rates

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Fig. 8

Influence of flow rate on pressure amplitude at fBPF

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Fig. 9

Flow distributions in the volute and impeller channels at different flow rates

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Fig. 10

Comparison of vorticity distribution at flow rates of 0.8ΦN and 1.0ΦN

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Fig. 11

RMS values in 0–20.66fn frequency band of 20 points versus flow rate

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Fig. 12

(a) Comparison of pressure spectra in low frequency band at points at θ = 18 deg and θ = 54 deg, (b) coherent analyses of P1 with P2 and P2 with P3, and (c) phase difference of P2–P3

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Fig. 13

RMS values in 0–fn frequency band versus flow rate

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Fig. 14

Angular distributions of pressure amplitudes at fBPF under various flow rates

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Fig. 15

Configurations of vorticity distributions around the volute tongue at the midspan of the impeller for four consecutive positions at nominal flow rate: (a) t1 = 0, (b) t2 = 18/360 ΔT, (c) t3 = 28/360 ΔT, and (d) t4 = 38/360ΔT

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Fig. 16

Angular distributions of RMS values in 0–20.66fn frequency band under various flow rates

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Fig. 17

Total energy of each monitoring point versus flow rate

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