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Research Papers: Flows in Complex Systems

Numerical and Experimental Study of Unsteady Flow in a Large Centrifugal Pump With Stay Vanes

[+] Author and Article Information
Zhongxin Gao

China Institute of Water Resources and Hydropower Research,
Beijing, China100038
e-mail: gaozhx@iwhr.com

Wenruo Zhu

China Institute of Water Resources and Hydropower Research,
Beijing, China100038
e-mail: kenanzwr@126.com

Li Lu

China Institute of Water Resources and Hydropower Research,
Beijing, China100038
e-mail: luli@iwhr.com

Jie Deng

China Institute of Water Resources and Hydropower Research,
Beijing, China100038
e-mail: dengjie@iwhr.com

Jianguang Zhang

China Institute of Water Resources and Hydropower Research,
Beijing, China100038
e-mail: zhangjg@iwhr.com

Fujun Wuang

College of Water Resources and Civil Engineering,
China Agricultural University,
Beijing, China100083
e-mail: wangfj@cau.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 26, 2013; final manuscript received January 4, 2014; published online May 7, 2014. Assoc. Editor: Edward M. Bennett.

J. Fluids Eng 136(7), 071101 (May 07, 2014) (10 pages) Paper No: FE-13-1118; doi: 10.1115/1.4026477 History: Received February 26, 2013; Revised January 04, 2014

The unsteady flow inside a large centrifugal pump with stay vanes was analyzed in this study. The static performance and pressure fluctuations in the pump were numerically predicted and were compared with experimental data. Considering the relative positions of the impeller to the volute tongue and stay vanes, the static performance which was obtained using a full unsteady calculation was compared with traditional steady calculation results. A comparison of the results with the experimental data showed that the operation condition farther from the design condition resulted in larger differences between the steady simulation and experimental results, with errors beyond reasonable limits, while the performance curves obtained by the unsteady calculations were closer to the experimental data. A comparison of the pressure fluctuations at four monitoring points with the experimental data showed that the amplitudes at HVS1 and HVS2 are much larger than at HD1 and HD2. The main frequency for these four monitoring points, which agreed well with the experimental data, was the blade passing frequency. The relative obvious errors in pressure fluctuations for HD1and HD2 were due to the inlet flow rate variation of the simulation. Thus, unsteady numerical simulations can be used to predict the pressure fluctuations when designing a pump.

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References

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Figures

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Fig. 1

Experimental impeller and model unit

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Fig. 2

Closed-circulation experimental system for model pump

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Fig. 3

Pressure fluctuation measurement point locations

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Fig. 4

Computational domain and grid meshing

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Fig. 6

Head and efficiency curve

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Fig. 7

Errors in the predicted head and efficiency relative to the experimental data

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Fig. 8

Centrifugal pump horizontal section

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Fig. 9

Pressure distribution (low flow rate of 78.8 L/s)

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Fig. 10

Streamline distribution (low flow rate of 78.8 L/s)

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Fig. 11

Pressure distribution (high flow rate of 177.2 L/s)

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Fig. 12

Streamline distribution (high flow rate of 177.2 L/s)

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Fig. 13

Diffuser head loss difference between the steady and unsteady calculations

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Fig. 14

Measured and calculated pressure fluctuations at the stay vanes (HVS1 and HVS2)

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Fig. 15

Measured and calculated pressure fluctuation spectra at the stay vanes (HVS1 and HVS2)

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Fig. 16

Measured and calculated pressure fluctuations at the suction tube (HD1 and HD2)

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Fig. 17

Measured and calculated pressure fluctuation spectra at the suction tube (HD1 and HD2)

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Fig. 18

Measured and calculated maximum pressure fluctuation amplitudes

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