Measurements on Fully Wetted and Ventilated Ring Wing Hydrofoils

[+] Author and Article Information
A. J. Acosta, T. Kiceniuk, E. R. Bate

Hydrodynamics Laboratory, Kármán Laboratory of Fluid Mechanics and Jet Propulsion, California Institute of Technology, Pasadena, Calif.

J. Eng. Ind 89(3), 445-455 (Aug 01, 1967) (11 pages) doi:10.1115/1.3610082 History: Received June 16, 1966; Online August 25, 2011


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 wetted 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.

Copyright © 1967 by ASME
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