A Note on the Unsteady Cavity Flow in a Tunnel

[+] Author and Article Information
J. H. Kim

Department of Mechanical Engineering, California Institute of Technology, Pasadena, Calif.

A. J. Acosta

California Institute of Technology, Pasadena, Calif.

J. Fluids Eng 96(1), 25-28 (Mar 01, 1974) (4 pages) doi:10.1115/1.3447089 History: Received July 26, 1973; Online October 12, 2010


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.

Copyright © 1974 by ASME
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