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Published March 1, 1974 | public
Journal Article Open

A Note on the Unsteady Cavity Flow in a Tunnel


The unsteady internal cavitating flow such as the one observed in a pump or a turbine is studied for a simple two-dimensional model of a base-cavitating wedge in an infinite tunnel and it is shown how the cavitation compliance can be calculated using the linearized free streamline theory. Numerical values are obtained for the limiting case of a free jet. Two important features are: First, the cavitation compliance is found to be of complex form, having additional resistive and reactive terms beyond the purely inertial oscillation of the whole channel in "slug flow." Second, the compliance has a strong dependence on frequency.

Additional Information

Contributed by the Fluids Engineering Division and presented at the Winter Annuul Meeting, Detroit, Mich., November 11-15, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received at ASME Headquarters, July 26, 1973. Paper No. 73-WA/FE-8. This work was supported by the National Aeronautics and Space Administration (Contract NASA 28046).


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