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Some observations of tip-vortex cavitation

Published online by Cambridge University Press:  26 April 2006

R. E. A. Arndt
Affiliation:
St. Anthony Falls Hydraulic Laboratory, University of Minnesota. Minneapolis. MN 55455, USA
V. H. Arakeri
Affiliation:
Indian Institute of Science, Bangalore, India
H. Higuchi
Affiliation:
Syracuse University, NY 13210, USA

Abstract

Cavitation has been observed in the trailing vortex system of an elliptic planform hydrofoil. A complex dependence on Reynolds number and gas content is noted at inception. Some of the observations can be related to tension effects associated with the lack of sufficiently large-sized nuclei. Inception measurements are compared with estimates of pressure in the vortex obtained from LDV measurements of velocity within the vortex. It is concluded that a complete correlation is not possible without knowledge of the fluctuating levels of pressure in tip-vortex flows. When cavitation is fully developed, the observed tip-vortex trajectory shows a surprising lack of dependence on any of the physical parameters varied, such as angle of attack, Reynolds number, cavitation number, and dissolved gas content.

Type
Research Article
Copyright
© 1991 Cambridge University Press

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