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Multiphase Flows

Identification of Critical Net Positive Suction Head From Noise and Vibration in a Radial Flow Pump for Different Leading Edge Profiles of the Vane

[+] Author and Article Information
S. Kumaraswamy

e-mail: s.kumaraswamy@gmail.com
Hydroturbomachines Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600 036, India

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received June 28, 2012; final manuscript received July 15, 2013; published online September 9, 2013. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 135(12), 121301 (Sep 09, 2013) (15 pages) Paper No: FE-12-1310; doi: 10.1115/1.4025072 History: Received June 28, 2012; Revised July 15, 2013

Experimental investigations concerning cavitation in radial flow pump for three different leading edge profiles of the vane were carried out in an open circuit system. The operating condition of the radial flow pump under cavitating case was understood by measurement of noise and vibration along with the pump parameters for various speeds and flow rates. The outcome of the experimental results revealed that the noise and vibration were better predictors of inception and development of cavitation. Further observation inferred from critical net positive suction head (NPSH) curve of 3% head drop and critical NPSH value of noise and vibration are presented.

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Figures

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Fig. 1

Vane leading edges used for this study

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Fig. 2

Leading edges of tested impellers

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Fig. 4

Instrumentation scheme for noise and vibration measurements

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Fig. 5

Experimental set up with instrumentation

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Fig. 6

Performance characteristics of PL, E2, and R3 LE impellers (a) head coefficient and efficiency versus flow coefficient (b) power coefficient versus flow coefficient

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Fig. 7

Performance characteristics of PL LE impeller at 1500 rpm along with noise and vibration variation

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Fig. 8

Performance characteristics of E2 LE impeller at 1500 rpm along with noise and vibration variation

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Fig. 9

Performance characteristics of R3 LE impeller at 1500 rpm along with noise and vibration variation

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Fig. 10

Performance characteristics at 1500 rpm for three LE impellers

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Fig. 11

3D cavitation characteristic curve of PL LE impeller at 1500 rpm

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Fig. 12

NPSH curve for PL LE impeller at 1500 rpm

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Fig. 13

3D cavitation characteristic curve for E2 LE impeller at 1500 rpm

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Fig. 14

NPSH curve for E2 LE impeller at 1500 rpm

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Fig. 15

3D cavitation characteristic curve for R3 LE impeller at 1500 rpm

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Fig. 16

NPSH curve for R3 LE impeller at 1500 rpm

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Fig. 17

Waterfall plot of noise for PL LE impeller at 1500 rpm and 80% of BEP flow (up to 100 kHz)

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Fig. 18

Waterfall plot of noise for PL LE impeller at 1500 rpm and 80% of BEP flow (up to 10 kHz)

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Fig. 19

Waterfall plot of vibration for PL LE impeller at 1500 rpm and 80% BEP flow (up to 10 kHz)

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Fig. 20

Waterfall plot of noise for PL LE impeller at 1500 rpm and 100% of BEP flow (up to 10 kHz)

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Fig. 21

Waterfall plot of vibration for PL LE impeller at 1500 rpm and 100% of BEP flow (up to 10 kHz)

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Fig. 22

Waterfall plot of noise for PL LE impeller at 1500 rpm and 120% of BEP flow (up to 10 kHz)

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Fig. 23

Waterfall plot of vibration for PL LE impeller at 1500 rpm and 120% of BEP flow (up to 10 kHz)

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Fig. 24

Average variation of noise and vibration for PL LE impeller at 1500 rpm and 80% of BEP flow

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Fig. 25

Average variation of noise and vibration for PL LE impeller at 1500 rpm and 100% of BEP flow

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Fig. 26

Average variation of noise and vibration for PL LE impeller at 1500 rpm and 120% of BEP flow

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Fig. 27

Critical points for noise and vibration average level at 1500 rpm for PL LE impeller

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Fig. 28

Critical points for noise and vibration average level at 1500 rpm for E2 LE impeller

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Fig. 29

Critical points for noise and vibration average level at 1500 rpm for R3 LE impeller

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Fig. 30

NPSH curve for 3% head drop with NPSH critical curve for noise and vibration average level for PL LE impeller

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Fig. 31

NPSH curve for 3% head drop with NPSH critical curve for noise and vibration average level for E2 LE impeller

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Fig. 32

NPSH curve for 3% head drop with NPSH critical curve for noise and vibration average level for R3 LE impeller

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