Sound Generation by a Centrifugal Pump at Blade Passing Frequency

[+] Author and Article Information
M. Morgenroth

Acres International Ltd., 4342 Queen Street, Niagara Falls, Ont., Canada L2E 6W1

D. S. Weaver

Dept. of Mechanical Engineering, McMaster University, Hamilton, Ont., Canada L8S 4L7

J. Turbomach 120(4), 736-743 (Oct 01, 1998) (8 pages) doi:10.1115/1.2841784 History: Received February 05, 1997; Revised October 21, 1997; Online January 29, 2008


This paper reports the results of an experimental study of the pressure pulsations produced by a centrifugal volute pump at its blade passing frequency and their amplification by acoustic resonance in a connected piping system. Detailed measurements were made of the pressure fluctuations in the piping as a function of pump speed and flow rate. A semi-empirical model was used to separate acoustic standing waves from hydraulic pressure fluctuations. The effects of modifying the cut-water geometry were also studied, including the use of flow visualization to observe the flow behavior at the cut-water. The results suggest that the pump may act as an acoustic pressure or velocity source, depending on the flow rate and the cut-water geometry. At conditions of acoustic resonance, the pump acted as an open termination of the piping, i.e., as a node in the acoustic pressure standing waves. Rounding the cut-water had the effect of reducing the amplitude of acoustic resonance, apparently because of the ability of the stagnation point to move and thereby reduce the vorticity generated.

Copyright © 1998 by The American Society of Mechanical Engineers
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