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RESEARCH PAPERS

Choked Flow About Vented or Cavitating Hydrofoils

[+] Author and Article Information
A. G. Fabula

U. S. Naval Ordnance Test Station, Pasadena, Calif.

J. Basic Eng 86(3), 561-567 (Sep 01, 1964) (7 pages) doi:10.1115/1.3653173 History: Received July 15, 1963; Online November 03, 2011

Abstract

Linearized theory for two-dimensional, choked-tunnel flow is developed for a vented or cavitating hydrofoil midway between infinite parallel walls, when the upper and lower free streamlines detach at an arbitrary chordwise location and at the trailing edge, respectively. Superposition of step-profile solutions gives the arbitrary-profile solution. Numerical calculations are made for two vented hydrofoils for exhaust at 30 percent chord and tunnel height-to-chord ratio of 3.5. The agreement with experiment becomes good after correction for the pressure at the test-section, static-pressure tap due to the hydrofoil and the cavity. Various aspects of the comparison for equal cavity number of choked flow with unbounded flow are discussed.

Copyright © 1964 by ASME
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