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Research Papers: Fluid-Structure Interaction

Exploring the Effect of V-Shaped Cut at Blade Exit of a Double Volute Centrifugal Pump

[+] Author and Article Information
Amro M. Al-Qutub

Mechanical Engineering Department,  King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabiaaqutub@kfupm.edu.sa

Atia E. Khalifa

Mechanical Engineering Department,  King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabiaakhalifa@kfupm.edu.sa

Faleh A. Al-Sulaiman

Mechanical Engineering Department,  King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabiafalehas@kfupm.edu.sa

J. Pressure Vessel Technol 134(2), 021301 (Jan 17, 2012) (8 pages) doi:10.1115/1.4004798 History: Received October 25, 2010; Revised June 20, 2011; Published January 17, 2012; Online January 17, 2012

The effect of V-cut at impeller blades’ exit on internal pressure fluctuations, case vibration, and performance of a double volute boiler-feed pump has been investigated. Scaled model pump and two impellers, with and without the V-cut, were used in a closed water test loop to conduct experimental testing. The V-cut increases the effective gap between the trailing edge of the impeller blades and volute tongue reducing the impeller-volute interaction, which is the origin of pressure pulsation inside the pump. It reduces pump vibration by different amounts depending on flow rate. The V-cut is more effective in reducing pressure fluctuations at off-design conditions. The reduction in pressure fluctuations and pump vibration was achieved at the expense of pump head. The energy content of pressure fluctuations measured at discharge and suction pipes proved to be insignificant compared to those measured inside the pump.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Original boiler-feed pump cartridge

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Figure 2

Model impellers used to study the effect of the V-cut

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Figure 3

Model pump design and measuring locations

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Figure 4

Effect of the V-cut at impeller blade exit on the pump performance

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Figure 5

Effect of the V-cut on static pressure distribution at different flow rates

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Figure 6

Typical waveform and frequency spectrum of pressure fluctuation: location 3, Q = Qn

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Figure 7

Effect of the V-cut on the FFT magnitudes (psig) of pressure fluctuations, measured at the first BPF (295 Hz) at different flow rates

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Figure 8

Effect of the V-cut on pressure fluctuations and their FFT Magnitudes (measured at first BPF) at discharge and suction pipes

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Figure 9

Typical vertical vibrations of the pump casing with the V-cut at Q = 0.5Qn

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Figure 10

Effect of the V-cut on vibration of pump casing

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Figure 11

Measuring pressure fluctuations at impeller exit both at axial midplane and volute sidewall

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Figure 12

Measuring the pressure fluctuations at volute wall and impeller midplane for both impellers: location 3

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