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Research Papers: Multiphase Flows

Experimental Investigation of Time-Frequency Characteristics of Pressure Fluctuations in a Double-Suction Centrifugal Pump

[+] Author and Article Information
Zhifeng Yao

College of Water Conservancy and Civil Engineering,  China Agricultural University, Beijing, China 100083yaozhifengchina@gmail.com

Fujun Wang1

College of Water Conservancy and Civil Engineering,  China Agricultural University, Beijing, China 100083wangfj@cau.edu.cn

Lixia Qu

College of Water Conservancy and Civil Engineering,  China Agricultural University, Beijing, China 100083qulixia2005@163.com

Ruofu Xiao

College of Water Conservancy and Civil Engineering,  China Agricultural University, Beijing, China 100083xiaoruofu2008@sina.com

Chenglian He

China Water Beifang Investigation, Design and Research Co. Ltd., Tianjin, China 300222 e-mail: zmhcl@163.com

Min Wang

College of Water Conservancy and Civil Engineering,  China Agricultural University, Beijing, China 100083 e-mail: wm56210@163.com

1

Corresponding author.

J. Fluids Eng 133(10), 101303 (Oct 04, 2011) (10 pages) doi:10.1115/1.4004959 History: Received May 08, 2011; Accepted August 25, 2011; Published October 04, 2011; Online October 04, 2011

Pressure fluctuation is the primary reason for unstable operations of double-suction centrifugal pumps. By using flush mounted pressure transducers in the semispiral suction chamber and the volute casing of a double-suction pump, the pressure fluctuation signals were obtained and recorded at various operating conditions. Spectral analyses were performed on the pressure fluctuation signals in both frequency domain and time-frequency domain based on fast Fourier transform (FFT) and an adaptive optimal-kernel time-frequency representation (AOK TFR). The results show that pressure fluctuations at the impeller rotating frequency and some lower frequencies dominated in the semispiral suction chamber. Pressure fluctuations at the blade passing frequency, the impeller rotating frequency, and their harmonic frequencies were identified in the volute casing. The amplitude of pressure fluctuation at the blade passing frequency significantly increased when the flow rate deviated from the design flow rate. At 107% of the design flow rate, the amplitude increased more than 254% than that at the design flow rate. The time-frequency characteristics of these pressure fluctuations were affected greatly by both operating conditions and measurement locations. At partial flow rates the pulsation had a great irregularity and the amplitudes at the investigated frequencies were much larger than ones at the design flow rate. An asymmetrical pressure fluctuation structure in the volute casing was observed at all flow rates. The pulsation behavior at the blade passing frequency was the most prominent near the volute tongue zone, and the pressure waves propagated in both the radial and circumferential directions.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Cross-sectional view of the tested pump

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Figure 2

Main parameters of the investigated pump

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Figure 3

Scheme of the test rig (1. Pressurizer tank; 2. regulating valve; 3. differential pressure transfer; 4. tested pump; 5. torque and speed sensor; 6. ac motor; 7. storage tank; 8. vacuum pump; 9. magnetic flow meter)

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Figure 4

Hydraulic characteristic of the tested pump at 2950 rpm

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Figure 5

The arrangement of monitoring points in walls of semispiral suction chamber (left) and volute casing (right)

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Figure 6

Frequency domain of pressure fluctuations on location S1

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Figure 7

The effect of change in flow rate on the amplitudes of pressure fluctuations on location S1

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Figure 8

Time-frequency representation of pressure fluctuations on location S1

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Figure 9

Frequency domain of pressure fluctuations on location V2

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Figure 10

Time-frequency representation of pressure fluctuations on location V2

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Figure 11

Frequency domain of pressure fluctuation on locations V2 , V3 , and V4 at design flow rate

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Figure 12

Time-frequency representation of pressure fluctuations on location V3

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Figure 13

Time-frequency representation of pressure fluctuations on location V4

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Figure 14

Coherence level between locations S1 and V2

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Figure 15

Coherence level between locations V2 and V3

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Figure 16

Coherence level between locations V2 and V4

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