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Technical Brief

Effects of the Radial Gap Between Impeller Tips and Volute Tongue Influencing the Performance and Pressure Pulsations of Pump as Turbine

[+] Author and Article Information
Sun-Sheng Yang

Research Center of Fluid Machinery Engineering and Technology,
Jiangsu University,
Zhenjiang, Jiangsu 212013, China
e-mail: yangsunsheng@126.com

Hou-Lin Liu

Professor
Research Center of Fluid Machinery Engineering and
Technology,
Jiangsu University,
Zhenjiang, Jiangsu 212013, China
e-mail: liuhoulin@ujs.edu.cn

Fan-Yu Kong

Professor
Research Center of Fluid Machinery Engineering and
Technology,
Jiangsu University,
Zhenjiang, Jiangsu 212013, China
e-mail: kongm@ujs.edu.cn

Bin Xia

Research Center of Fluid Machinery Engineering and Technology,
Jiangsu University,
Zhenjiang, Jiangsu 212013, China
e-mail: xia_bin2007@126.com

Lin-Wei Tan

Research Center of Fluid Machinery Engineering and Technology,
Jiangsu University,
Zhenjiang, Jiangsu 212013, China
e-mail: 35005435@qq.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 5, 2013; final manuscript received January 9, 2014; published online March 17, 2014. Assoc. Editor: Edward M. Bennett.

J. Fluids Eng 136(5), 054501 (Mar 17, 2014) (8 pages) Paper No: FE-13-1006; doi: 10.1115/1.4026544 History: Received January 05, 2013; Revised January 09, 2014

The radial gap between the impeller tips and volute tongue is an important factor influencing the overall performance and unsteady pressure fields of the pump as turbine (PAT). In this paper, a numerical investigation of the PAT's steady performance with different radial gaps was first performed. The results show that there is an optimal radial gap for a PAT to achieve its highest efficiency. An analysis of the PAT's unsteady pressure fields indicates that the rotorstator interaction of a rotating impeller and stationery volute would cause high frequency unsteady pulsation within the volute and low frequency unsteady pressure pulsation within the impeller. The high frequency unsteady pressure pulsation would propagate through the PAT's flow channel. Thus, the unsteady pressure field within the impeller is the combined effect of these two kinds of pressure pulsations. The unsteady pressure pulsation within the outlet pipe is mainly caused by the propagation of unsteady pressure formed within the volute. With the increase of the radial gap, the amplitude of high frequency unsteady pressure pulsation within the volute caused by the rotor-stator interaction is decreased, while the amplitude of the low frequency unsteady pressure pulsation caused by the rotor-stator interaction within the impeller remains unchanged.

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Figures

Grahic Jump Location
Fig. 1

Impeller with three volutes: (a) δ = 0.067D2, (b) δ = 0.145D2, and (c) δ = 0.224D2

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Fig. 3

Locations of pressure monitoring points

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Fig. 4

Performance curves of the PAT with different radial gaps

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Fig. 5

Unsteady pressure distributions within the volute for volutes with different radial gaps

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Fig. 6

Frequency domain of unsteady pressure distributions within the volute for volutes with different radial gaps

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Fig. 7

Time domain of unsteady pressure distributions within the impellers for different radial gaps

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Fig. 8

The combination of unsteady pressure within the impeller

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Fig. 9

Frequency domain of unsteady pressure distributions within the impellers for different radial gaps

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Fig. 10

Time domain of unsteady pressure distributions within the outlet pipes for different radial gaps

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Fig. 11

Frequency domain of unsteady pressure distributions within the outlet pipes for different radial gaps

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