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Dynamic Response of Ducted Bubbly Flows to Turbomachinery-Induced Perturbations

d'Auria, Fabrizio and d'Agostino, Luca and Brennen, Christopher E. (1996) Dynamic Response of Ducted Bubbly Flows to Turbomachinery-Induced Perturbations. Journal of Fluids Engineering, 118 (5). pp. 595-601. ISSN 0098-2202.

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The present work investigates the dynamics of the three-dimensional, unsteady flow of a bubbly mixture in a cylindrical duct subject to a periodic pressure excitation at one end. One of the purposes is to investigate the bubbly or cavitating flow at inlet to or discharge from a pump whose blade motions would provide such excitation. The flow displays various regimes with radically different wave propagation characteristics. The dynamic effects due to the bubble response may radically alter the fluid behavior depending on the void fraction of the bubbly mixture, the mean bubble size, the pipe diamter, the angular speed of the turbomachine and the mean flow Mach number. This simple linearized analysis illustrates the importance of the complex interactions of the dynamics of the bubbles with the average flow, and provides information on the propagation and growth of the turbopump-induced disturbances in the feed lines operating with bubbly or cavitating liquids. Examples are presented to illustrate the influence of the relevant flow parameters. Finally, the limitations of the theory are outlined.

Item Type:Article
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. The authors wish to thank Professor T. Colonius for valuable discussions on the subject matter.
Issue or Number:5
Record Number:CaltechAUTHORS:DAUjfe96
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93
Deposited By: Christopher Brennen
Deposited On:24 Sep 2004
Last Modified:02 Oct 2019 22:16

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