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Dynamics of Closed Circuit Hydraulic Model Loops

[+] Author Affiliations
Bjo̸rnar Svingen

Flow Design Bureau AS, Trondheim, Norway

Morten Kjeldsen

Norwegian University of Science and Technology, Trondheim, Norway

Roger E. A. Arndt

University of Minnesota, Minneapolis, MN

Paper No. FEDSM2002-31003, pp. 349-354; 6 pages
doi:10.1115/FEDSM2002-31003
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

This paper reviews the issue of making unsteady measurements involving cavitating flow in traditional test loops. Measurements of the dynamic response of a water tunnel during testing of a partially cavitating hydrofoil are presented and reviewed in the context of current theory. Data were collected from an array of pressure transducers that were distributed around the tunnel loop. In the post processing of these data, gain and phase response data were calculated. Theoretical analysis consisted of splitting the system into different elements, and included the compressibility of water in the physics used to describe each element. While solving the global system an eigenvalue solution was found, thus no node specific solution is obtained. This work is currently being extended with the aim of obtaining node specific values such that a more direct comparison between the experimental and theoretical work can be made.

Copyright © 2002 by ASME

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