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Published August 1967 | Reprint
Journal Article Open

Measurements on Fully Wetted and Ventilated Ring Wing Hydrofoils


Force measurements and visual observations were made in a water tunnel on fully wetted and ventilated flows past a family of conical ring wings having a flat plate section geometry. The diameter-chord ratio was varied from one to three, at a fixed total included cone angle of 12 deg. The fully welted flows all exhibited separation from the leading edge except for the largest diameter-chord ratio, a result which has been attributed to excessive cone angle. The effect of ventilation is to reduce markedly the lift curve slope. Pressure distribution measurements were also made under ventilating conditions for one member of this series. The effect of ventilation over only a portion of the circumference of the ring was also briefly investigated; large cross forces were developed by such ventilation.

Additional Information

Copyright © 1967 by ASME. Contributed by the Underwater Technology Division and presented at the Winter Annual Meeting, New York, N.Y., November 27-December 1, 1966, of The American Society of Mechanics Engineers. Manuscript received at ASMTE Headquarters, June 16, 1966. Paper No. 66 - WA/UnT-4. The authors would like to acknowledge the help of the laboratory staff and would especially like the mention the efforts of Messrs. L. Whitcanack, W. Wilson, and C. Eastvedt in carrying out the experiments. They would further like to acknowledge the suggestions of Mr. O. Seidman in reviewing the manuscript. The work was supported by the Office of Naval Research under Contract Nonr 220(54) and administered under the technical direction of the Bureau of Naval Weapons, Fluid Mechanics and Flight Dynamics Branch, Code RRRE-4.

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