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A Study on the Unstable Coupling Between Pumps and Hydraulic Circuits With Entrapped Gas Pockets

[+] Author Affiliations
Jorge L. Parrondo-Gayo, José González-Pérez, Joaquín Fernández-Francos

Universidad de Oviedo, Gijón, Spain

Juan Antuña-Schütze

OTS Ingeniería, Gijón, Spain

Paper No. FEDSM2002-31317, pp. 229-234; 6 pages
doi:10.1115/FEDSM2002-31317
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 1: Fora, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3615-0 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

A theoretical and experimental study has been conducted on the mass oscillation instability in hydraulic systems with entrapped gas pockets and pumps with positive slope in the head curve. The theoretical study was composed of an analysis of the critical conditions for the instability to develop, followed by the numerical resolution of the fundamental equations that govern the phenomenon, assuming unsteady one-dimensional flow, in order to simulate the limit cycle oscillations of the unstable system. Additionally a series of laboratory tests was conducted on a conventional centrifugal pump, with variation of the initial volume of an entrapped air pocket in the circuit. As expected from the predictions of the theoretical model, instability was found to developed with pressure amplitude oscillations and frequency dependent on the amount of entrapped air.

Copyright © 2002 by ASME
Topics: Pumps , Circuits

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