STUDY ON FLOW AND CAVITATION AROUND A FINITE SPAN SWEPTBACK HYDROFOIL
The paper describes experimental and numerical results of a 45 deg sweptback hydrofoil of NACA 0012 section and aspect ratio of 3, comparing them with those of an elliptical planform hydrofoil. In the experiment, lift and drag coefficients, pressure distribution of the hydrofoil, velocity distribution around tip vortex and wake distribution were measured at some typical conditions. The flow field around the foil was also investigated numerically. The following conclusions were obtained: 1) pressure gradient from root to tip appears on the back side of the sweptback foil because of its planform configuration, this causes an out-flow in the boundary layer; 2) the sweptback foil is less prone to stall, compared to the elliptical foil and 3) the tip vortex cavity of the sweptback foil is weaker than that of the elliptical foil. The sheet cavity on the sweptback foil is divided into several parts which rotated at their terminations in the same direction as the tip vortex. These results can be elucidated by the occurrence of longitudinal vorticity due to the out-flow.
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Supplemental Notes:
- J Soc Naval Arch Japan, v 176, Dec 1994, p 43 [8 p, 12 ref, 15 fig]
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Authors:
- KATO, H
- Yamaguchi, H
- Publication Date: 1994
Language
- Japanese
Subject/Index Terms
- TRT Terms: Cavitation (Mechanics); Flow fields; Hydrofoils; Velocity
- Old TRIS Terms: Velocity distribution
- Subject Areas: Marine Transportation; Materials;
Filing Info
- Accession Number: 00710691
- Record Type: Publication
- Source Agency: British Maritime Technology
- Files: TRIS
- Created Date: Aug 14 1995 12:00AM