HYDROFOIL THEORY FOR VERTICAL WATER ENTRY
A theory is presented for the hydrodynamics associated with slender two-dimensional bodies penetrating a fluid surface. Within the framework of a small disturbance approximation closed form solutions are obtained for fully-wetted entries in the high- and low-speed limiting cases. General expressions are obtained for the lift, moment and free-surface motion as functions of the hydrofoil geometry and are applied to a flat plate and parabolic camberline. An analytical model is established for a fully-ventilated entry at high speeds. The first order influence of gravity on cavity collapse is identified by a similarity parameter. The experimental investigation of a thin wedge at several incidence angles and speeds is described and the results of a photographic study are presented. The observed free boundary motion and splash patterns agree well with the theoretical predictions.
-
Corporate Authors:
Massachusetts Institute of Technology
Department of Ocean Engineering, 77 Massachusetts Avenue
Cambridge, MA United States 02139 -
Authors:
- Cox, B D
- Publication Date: 1971-5
Subject/Index Terms
- TRT Terms: Aerodynamic lift; Cavitation (Mechanics); Hydrofoils; Thinness; Ventilation systems
- Old TRIS Terms: Hydrofoil models; Lifting surface theory; Slender bodies; Ventilated hydrofoils
- Subject Areas: Design; Marine Transportation;
Filing Info
- Accession Number: 00034681
- Record Type: Publication
- Source Agency: Massachusetts Institute of Technology
- Files: TRIS
- Created Date: Sep 29 1973 12:00AM