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Research Papers: Flows in Complex Systems

Influence of the Blade Trailing Edge Profile on the Performance and Unsteady Pressure Pulsations in 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

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

Dan Ni

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

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 May 18, 2015; final manuscript received October 21, 2015; published online January 6, 2016. Assoc. Editor: Frank C. Visser.

J. Fluids Eng 138(5), 051106 (Jan 06, 2016) (10 pages) Paper No: FE-15-1336; doi: 10.1115/1.4031911 History: Received May 18, 2015; Revised October 21, 2015

The blade trailing edge profile is of crucial importance for the performance and pressure pulsations of centrifugal pumps. In the present study, numerical investigation is conducted to analyze the effect of the blade trailing edge profile influencing the performance and unsteady pressure pulsations in a low specific speed centrifugal pump. Five typical blade trailing edges are analyzed including original trailing edge (OTE), circle edge (CE), ellipse on pressure side (EPS), ellipse on suction side (ESS), and ellipse on both sides (EBS). Results show that the well-designed blade trailing edges, especially for the EPS and EBS profiles, can significantly improve the pump efficiency. Pressure amplitudes at fBPF and 2fBPF are together calculated to evaluate the influence of the blade trailing edge profile on pressure pulsations. The EPS and EBS profiles contribute obviously to pressure pulsations reduction. In contrast, the CE and ESS profiles lead to increase of pressure pulsation amplitude compared with the OTE pump. Vorticity distribution at the blade trailing edge demonstrates that the EPS and EBS profiles have an effective impact on reducing vortex intensity at the blade trailing edge. Consequently, rotor–stator interaction could be attenuated leading to lower pressure pulsation amplitude. It is thought to be the main reason of pressure pulsations reduction obtained with the proper modified blade trailing edges. The results would pave the way for further optimization of the blade trailing edge profile.

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Figures

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Fig. 1

Different blade trailing edges designed for investigation: (a) OTE, (b) CE, (c) EPS, (d) ESS, and (e) EBS

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Fig. 2

Partial computational zone of the model pump

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Fig. 3

Structured mesh of the impeller

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Fig. 4

Locations of pressure monitoring points

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Fig. 10

Pressure spectra of the pump with different blade trailing edges at four positions at nominal flow rate

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Fig. 9

Time-domain pressure signals for the pump with different blade trailing edges at four positions and the relative impeller positions with related to the volute tongue at nominal flow rate

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Fig. 8

Comparison of pressure amplitude spectra of the OTE model pump at nominal flow rate

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Fig. 7

Predicted performances of model pump with different blade trailing edges (steady-state, SST k–ω)

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Fig. 6

Comparison between experimental and numerical results of the OTE pump

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Fig. 13

Vorticity distributions on different blade trailing edges at nominal flow rate

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Fig. 11

Comparison of pressure amplitude at fBPF at nominal flow rate

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Fig. 12

Comparison of pressure amplitude at 2fBPF at nominal flow rate

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