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Auto-Oscillation of Cavitating Inducers

Braisted, D. M. and Brennen, C. E. (1980) Auto-Oscillation of Cavitating Inducers. In: Polyphase Flow and Transport Technology. American Society of Mechanical Engineers , New York, NY, pp. 157-166.

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This paper presents details of measurements on the instability know as auto-oscillation which occurs in systems with cavitating pumps. Specific measurements are made of onset cavitation number and auto-osciallation frequency for a range of inducers. It has been shown that auto-oscillation is a system instability caused by the active dynamic characteristics of the cavitating pump. A system anslysis is presented which utilized previously measured dynamic transfer functions for the inducers; the resulting predictions of instability are consistent with the observations. Though the onset cavitation number is a function of the entire system it is also show that, given the onset cavitation number, the auto-oscillation frequency is only weakly dependent on the system and primarily a function of the pump dynamics. Detailed measurements of the amplitude and phase of fluctuating pressures and flow rates during auto-oscillation are also presented. These strongly suggest that the pump dynamics are primarily determined by the complicated flow at inlet to the inducer which involves pre-swirl generated by a strong backflow. Some data on the non-linear effect of auto-osciallation on overall mean performance are also presented.

Item Type:Book Section
Record Number:CaltechAUTHORS:BRApftt80
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45
Deposited By: Christopher Brennen
Deposited On:19 Aug 2004
Last Modified:02 Oct 2019 22:16

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