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Bubble Dynamics Effects on the Rotordynamic Forces in Cavitating Inducers

d'Auria, Fabrizio and d'Agostino, Luca and Brennen, Christopher E. (1995) Bubble Dynamics Effects on the Rotordynamic Forces in Cavitating Inducers. In: Cavitation and Multiphase Flow Forum. Fluids Engineering Division. Vol.FED-21. No.210. American Society of Mechanical Engineers , New York, pp. 47-54. http://resolver.caltech.edu/CaltechAUTHORS:DAUcmff95

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Abstract

The present work investigates the dynamics of idealized bubbly and cavitating flows in whirling helical inducers, with the purpose of understanding the impact of the bubble response on the rotordynamic forces exerted by the fluid on the turbomachine under cavitating conditions. Inertial, damping, and compressibility effects in the dynamics of the bubbles are included. The effect of the whirl excitation on the two-phase flow is dependent on the wave propagation speed and the bubble resonance behavior in the bubbly mixture. These, in turn, lead to rotordynamic forces which are complicated functions of the whirl frequency and depend on the void fraction of the bubbles and on the mean flow properties. Under cavitating conditions the dynamic response of the bubbles induces major deviations from the non-cavitating flow solutions. The quadratic dependence of rotordynamic fluid forces on the whirl speed, which is typical of cavitation-free operation is significantly modified. Results are presented to illustrate the influence of the various flow parameters.


Item Type:Book Section
Additional Information:This work has been supported by the Italian Department of Universities and Scientific & Technologic Research under the 1993 grant program for academic research and by the Office of Naval Research under grant number N-00014-91-K-1295. Some of the authors would like to express their gratitude to Profs. Mariano Andrenucci and Renzo Lazzeretti of the Aerospace Engineering Department of Pisa University, Pisa, Italy, for their encouragement in the completion of the present work.
Record Number:CaltechAUTHORS:DAUcmff95
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:DAUcmff95
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92
Collection:CaltechAUTHORS
Deposited By: Christopher Brennen
Deposited On:24 Sep 2004
Last Modified:26 Dec 2012 08:39

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